Bulimia nervosa: Difference between revisions
Kaltenmeyer (talk | contribs) m clean up, typo(s) fixed: particulary → particularly |
|||
Line 1: | Line 1: | ||
{{short description|Type of eating disorder}} |
|||
{{Cleanup|date=April 2007}} |
|||
{{Update|date=September 2024|reason=}} |
|||
{{DiseaseDisorder infobox |
|||
| Name = Bulimia nervosa |
|||
{{Infobox medical condition (new) |
|||
| DiseasesDB = 1770 |
|||
| name = Bulimia nervosa |
|||
| ICD10 = F50.2 |
|||
| synonyms = Bulimia |
|||
| ICD9 = {{ICD9|307.51}} | |
|||
| image = BulemiaEnamalLoss.JPG |
|||
| eMedicineSubj = emerg |
|||
| caption = Loss of enamel ([[acid erosion]]) from the inside of the upper front teeth as a result of bulimia |
|||
| eMedicineTopic = 810 |
|||
| field = [[Psychiatry]], [[clinical psychology]] |
|||
| eMedicine_mult = {{eMedicine2|med|255}} |
|||
| symptoms = Eating a large amount of food in a short amount of time followed by vomiting or the use of [[laxatives]], often normal weight<ref name=Buli2012>{{cite journal | vauthors = Bulik CM, Marcus MD, Zerwas S, Levine MD, La Via M | title = The changing "weightscape" of bulimia nervosa | journal = The American Journal of Psychiatry | volume = 169 | issue = 10 | pages = 1031–6 | date = October 2012 | pmid = 23032383 | pmc = 4038540 | doi = 10.1176/appi.ajp.2012.12010147 }}</ref><ref name=Women2012/> |
|||
| complications = Breakdown of the teeth, [[Depression (mood)|depression]], [[anxiety]], [[substance use disorder]]s, [[suicide]]<ref name=Women2012/><ref name=Sm2012/> |
|||
| onset = |
|||
| duration = |
|||
| types = |
|||
| causes = [[Genetics|Genetic]] and environmental factors<ref name=Women2012/><ref name=Hay2010/> |
|||
| risks = |
|||
| diagnosis = Based on person's medical history<ref name=DSM5/> |
|||
| differential = [[Anorexia]], [[binge eating disorder]], [[Kleine-Levin syndrome]], [[borderline personality disorder]]<ref name=DSM5/> |
|||
| prevention = |
|||
| treatment = [[Cognitive behavioral therapy]]<ref name=Women2012/><ref name="Hay2013">{{cite journal |vauthors=Hay P |date=July 2013 |title=A systematic review of evidence for psychological treatments in eating disorders: 2005-2012 |journal=The International Journal of Eating Disorders |volume=46 |issue=5 |pages=462–9 |doi=10.1002/eat.22103 |pmid=23658093}}</ref> |
|||
| medication = [[Selective serotonin reuptake inhibitor]]s, [[tricyclic antidepressant]]<ref name=Hay2010/><ref name="Mc2012">{{cite journal |vauthors=McElroy SL, Guerdjikova AI, Mori N, O'Melia AM |date=October 2012 |title=Current pharmacotherapy options for bulimia nervosa and binge eating disorder |journal=Expert Opinion on Pharmacotherapy |volume=13 |issue=14 |pages=2015–26 |doi=10.1517/14656566.2012.721781 |pmid=22946772 |s2cid=1747393}}</ref> |
|||
| prognosis = Half recover over 10 years with treatment<ref name=Hay2010/> |
|||
| frequency = 3.6 million (2015)<ref name=GBD2015Pre/> |
|||
| deaths = |
|||
}} |
}} |
||
<!-- Definition and symptoms --> |
|||
'''Bulimia nervosa''', mostly known as [http://cougar.eb.com/soundc11/b/bulimi02.wav '''bulimia'''] is an [[eating disorder]] in which the subject engages in recurrent [[binge eating]] followed by feelings of guilt, depression, and self-condemnation. The sufferer will then engage in compensatory behaviors to make up for the excessive eating, which are referred to as "purging". Purging can take the form of [[defensive vomiting|vomiting]], [[fasting]], the use of [[laxative]]s, [[enema]]s, [[diuretic]]s or other [[medications]], or overexercising.<ref>[http://dictionary.reference.com/browse/bulimia bulimia - Definitions from Dictionary.com<!-- Bot generated title -->]</ref> |
|||
'''Bulimia nervosa''', also known simply as '''bulimia''', is an [[eating disorder]] characterized by [[binge eating]] (eating large quantities of food in a short period of time, often feeling out of control) followed by compensatory behaviors, such as vomiting, excessive exercise, or fasting to prevent weight gain.<ref name=":0">{{Cite web |title=Bulimia nervosa - Symptoms and causes |url=https://www.mayoclinic.org/diseases-conditions/bulimia/symptoms-causes/syc-20353615 |access-date=2024-12-05 |website=Mayo Clinic |language=en}}</ref> |
|||
Other efforts to lose weight may include the use of [[diuretic]]s, [[stimulant]]s, [[water fasting]], or excessive exercise.<ref name="Women2012">{{cite web |date=July 16, 2012 |title=Bulimia nervosa fact sheet |url=http://www.womenshealth.gov/publications/our-publications/fact-sheet/bulimia-nervosa.html?from=AtoZ |url-status=live |archive-url=https://web.archive.org/web/20150619030219/http://womenshealth.gov/publications/our-publications/fact-sheet/bulimia-nervosa.html?from=AtoZ |archive-date=June 19, 2015 |access-date=June 27, 2015 |website=Office on Women's Health}}</ref> Most people with bulimia are at normal weight and have higher risk for other mental disorders, such as depression, anxiety, borderline personality disorder, bipolar disorder, and problems with drugs to alcohol. There is also a higher risk of suicide and self-harm. |
|||
The word ''bulimia'' comes from the Latin (''būlīmia'') from the Greek ''βουλῑμια'' (boulīmia), ravenous hunger, compounded from ''βους'' (bous), ox + ''λῑμος'' (līmos), hunger.<ref>[http://www.minddisorders.com/Br-Del/Bulimia-nervosa.html Bulimia nervosa - Definition, Description, Causes and symptoms, Demographics, Diagnosis, Treatments, Prognosis, Prevention<!-- Bot generated title -->]</ref> |
|||
<!-- Cause and diagnosis --> |
|||
== Diagnosis == |
|||
Bulimia is more common among those who have a close relative with the condition.<ref name=Women2012/> The percentage risk that is estimated to be due to genetics is between 30% and 80%.<ref name="Hay2010">{{cite journal |vauthors=Hay PJ, Claudino AM |date=July 2010 |title=Bulimia nervosa |journal=BMJ Clinical Evidence |volume=2010 |pages=1009 |pmc=3275326 |pmid=21418667}}</ref> Other risk factors for the disease include [[psychological stress]], cultural pressure to attain a certain body type, poor self-esteem, and [[obesity]].<ref name=Women2012/><ref name=Hay2010/> Living in a culture that commercializes or glamorizes [[dieting]], and having parental figures who fixate on weight are also risks.<ref name=Hay2010/> |
|||
Diagnosis is based on a person's medical history;<ref name="DSM5">{{Cite book |url=https://archive.org/details/diagnosticstatis0005unse/page/345 |title=Diagnostic and Statistical Manual of Mental Disorders |vauthors=((American Psychiatric Association)) |publisher=American Psychiatric Publishing |year=2013 |isbn=978-0-89042-555-8 |edition=Fifth |location=Arlington, VA |pages=[https://archive.org/details/diagnosticstatis0005unse/page/345 345–349]}}</ref> however, this is difficult, as people are usually secretive about their binge eating and purging habits.<ref name=Hay2010/> Further, the diagnosis of [[anorexia nervosa]] takes precedence over that of bulimia.<ref name=Hay2010/> Other similar disorders include [[binge eating disorder]], [[Kleine–Levin syndrome]], and [[borderline personality disorder]].<ref name=DSM5/> |
|||
The criteria for diagnosing a patient with bulimia are:<ref>Abnormal Psychology An Integrative Approach - First Canadian edition. By D.H. Barlow, V.M.Durand, and S.H. Stewart</ref> |
|||
# Recurrent episodes of binge eating. An episode of binge eating is characterized by both of the following: |
|||
## Eating, in a fixed period of time (e.g., within any two-hour period), an amount of food that is definitely larger than most people would eat during a similar period of time and under similar circumstances. |
|||
## A sense of lack of control over eating during the episode (e.g., a feeling that one cannot stop eating or control what or how much one is eating). |
|||
# Recurrent inappropriate compensatory behavior to prevent weight gain, such as self-induced vomiting; misuse of laxatives, diuretics or other medications; fasting, or excessive exercise. |
|||
# The binge eating and inappropriate compensatory behaviors both occur, on average, at least twice a week for three months. |
|||
# Self-evaluation is unduly influenced by hotty shape and weight. |
|||
# The disturbance does not occur exclusively during episodes of [[anorexia nervosa]]. |
|||
<!-- Treatment and prognosis --><!-- Epidemiology and history -->==Signs and symptoms== |
|||
See the [[Diagnostic and Statistical Manual of Mental Disorders]]. If any of these symptoms are noticed, a doctor or psychologist should be contacted. However, these symptoms are often difficult to spot. Unlike [[anorexia nervosa]], the person must be of normal or higher weight and is less likely to drop a significant amount of weight on a continual basis. Because bulimia carries a great deal of shame, the bulimic desperately tries to hide the symptoms from family and friends. Bulimia is more likely to span over a lifetime unnoticed, causing a great deal of isolation and stress for the suffering individual. Despite the frequent lack of obvious physical symptoms, bulimia has proven to be fatal, as malnutrition takes a serious toll on every bodily organ.<ref>[http://www.aafp.org/afp/980600ap/mcgilley.html Assessment and Treatment of Bulimia Nervosa - June 1998 - American Academy of Family Physicians<!-- Bot generated title -->]</ref> |
|||
[[File:Bulimiafaqdia.jpg|thumb|upright=1.6|How bulimia affects the body]] |
|||
[[File:Oral Manifestation of Bulimia..jpg|thumb|The erosion on the lower teeth was caused by bulimia. For comparison, the upper teeth were restored with porcelain veneers.<ref>Dorfman J, [http://www.nycdentist.com/dental-photo-detail/2447/88/Diet-Nutrition-teeth-erosion-anorexia-bulimia-acid-fruit-juice-soda The Center for Special Dentistry] {{Webarchive|url=https://web.archive.org/web/20150211120011/http://www.nycdentist.com/dental-photo-detail/2447/88/Diet-Nutrition-teeth-erosion-anorexia-bulimia-acid-fruit-juice-soda |date=February 11, 2015 }}.</ref>]] |
|||
Bulimia typically involves rapid and out-of-control eating, which is followed by self-induced vomiting or other forms of purging.<ref>{{Cite journal |last1=Steinhausen |first1=Hans-Christoph |last2=Weber |first2=Sandy |date=December 2009 |title=The Outcome of Bulimia Nervosa: Findings From One-Quarter Century of Research |url=https://psychiatryonline.org/doi/10.1176/appi.ajp.2009.09040582 |journal=American Journal of Psychiatry |volume=166 |issue=12 |pages=1331–1341 |doi=10.1176/appi.ajp.2009.09040582 |pmid=19884225 |issn=0002-953X}}</ref><ref name=":0" /> This cycle may be repeated several times a week or, in more serious cases, several times a day<ref>{{cite journal|year= 2005|title= Bulimia Nervosa|journal= Let's Talk Facts|pages= 1|url= http://www.psychiatry.org/File%20Library/Mental%20IIlness/Lets%20Talk%20Facts/Eating-Disorders-B1.pdf|access-date= September 13, 2013|archive-date= March 19, 2015|archive-url= https://web.archive.org/web/20150319060513/http://www.psychiatry.org/File%20Library/Mental%20IIlness/Lets%20Talk%20Facts/Eating-Disorders-B1.pdf|url-status= dead}}</ref> and may directly cause: |
|||
* [[Dehydration]] |
|||
* [[Water-electrolyte imbalance|Electrolyte imbalance]] can lead to [[cardiac arrhythmia|abnormal heart rhythms]], [[cardiac arrest]], and even death |
|||
* Oral [[Physical trauma|trauma]], lacerations to the lining of the mouth or throat due to forced throwing up movements.<ref name=":1">{{Cite web |last=Clinic |first=Cleavland |date=May 15, 2022 |title=Bulimia Nervosa |url=https://my.clevelandclinic.org/health/diseases/9795-bulimia-nervosa}}</ref> |
|||
* [[Russell's sign]]: [[callus]]es on knuckles and back of hands due to repeated trauma from incisors<ref>{{cite journal | vauthors = Joseph AB, Herr B | title = Finger calluses in bulimia | journal = The American Journal of Psychiatry | volume = 142 | issue = 5 | pages = 655a–655 | date = May 1985 | pmid = 3857013 | doi = 10.1176/ajp.142.5.655a }}</ref><ref>{{cite journal | vauthors = Wynn DR, Martin MJ | title = A physical sign of bulimia | journal = Mayo Clinic Proceedings | volume = 59 | issue = 10 | pages = 722 | date = October 1984 | pmid = 6592415 | doi = 10.1016/s0025-6196(12)62063-1 | doi-access = free }}</ref> |
|||
* Swollen [[salivary gland]]s (in the neck, under the jawline)<ref name="ada">{{Cite web |title=Eating Disorders |url=http://www.ada.org/public/topics/eating_disorders.asp |archive-url=https://web.archive.org/web/20090203133827/http://ada.org/public/topics/eating_disorders.asp |archive-date=February 3, 2009 |work=Oral Health Topics A–Z |publisher=[[American Dental Association]]}}</ref><ref name="mcgilley">{{cite journal | vauthors = Mcgilley BM, Pryor TL | title = Assessment and treatment of bulimia nervosa | journal = American Family Physician | volume = 57 | issue = 11 | pages = 2743–50 | date = June 1998 | pmid = 9636337 | url = http://www.aafp.org/link_out?pmid=9636337 }}</ref> |
|||
* Gastrointestinal problems, like constipation and acid reflux<ref name=":1" /> |
|||
* [[Constipation]] or [[diarrhea]] |
|||
* [[Hypotension]] |
|||
* [[Infertility]] and/or irregular menstrual cycles |
|||
* Weight Fluctuations |
|||
These are some of the many signs that may indicate whether someone has bulimia nervosa:<ref>{{cite news |work=[[Illawarra Mercury]] |title=Symptoms Of Bulimia Nervosa |url=http://torontostar.info/bulimia-nervosa-symptoms.php |archive-url=https://web.archive.org/web/20160221214651/http://torontostar.info/bulimia-nervosa-symptoms.php |url-status=dead |archive-date=February 21, 2016 |date=February 23, 2001 }}</ref> |
|||
== Cyclic patterns == |
|||
* A fixation on the number of calories consumed |
|||
* A fixation on an extreme consciousness of one's weight |
|||
* Low self-esteem and/or [[self-harming]] |
|||
* [[Suicidal]] tendencies |
|||
* An irregular menstrual cycle in women |
|||
* Regular trips to the bathroom, especially soon after eating |
|||
* [[Depression (mood)|Depression]], [[anxiety disorders]], and [[sleep disorders]] |
|||
* Frequent occurrences involving the consumption of abnormally large portions of food<ref>{{cite web|title=Bulimia Nervosa|url=https://www.nationaleatingdisorders.org/bulimia-nervosa|website=Proud2BME|publisher=The National Eating Disorders Association|access-date=December 5, 2014|url-status=live|archive-url=https://web.archive.org/web/20141210162622/https://www.nationaleatingdisorders.org/bulimia-nervosa|archive-date=December 10, 2014}}</ref> |
|||
* The use of [[laxatives]], [[diuretic]]s, and [[diet pills]] |
|||
* Compulsive or excessive exercise |
|||
* Unhealthy/dry skin, hair, nails, and lips |
|||
* [[Fatigue]], or exhaustion |
|||
As with many psychiatric illnesses, delusions can occur, in conjunction with other signs and symptoms, leaving the person with a false belief that is not ordinarily accepted by others.<ref name=Barker03>{{cite book | vauthors = Barker P |title=Psychiatric and Mental Health Nursing: The Craft of Caring |publisher=Arnold |location=Great Britain |year=2003 |isbn=978-0340810262 }}{{page needed|date=August 2013}}</ref> |
|||
Bulimics go through cycles of over-eating and purging that can be very destructive to the body. These cycles often involve rapid and out-of-control eating, which may stop when the bulimic is interrupted by another person or when his/her stomach hurts from over-extension, followed by self-induced vomiting or other forms of purging. This cycle may be repeated several times a week or, in serious cases, several times a day.<ref>http://www.psych.org/public_info/eatingdisorders52201.cfm</ref> |
|||
People with bulimia nervosa may also exercise to a point that excludes other activities.<ref name=Barker03/> |
|||
Some bulimics eat secretly; others eat socially but are bulimic in private. They also differ in "how much" they purge. Some can vomit without gagging themselves after eating. Often when the urge hits, they go to great lengths to purge, as if an uncontrollable urge is making them do so. Medical evidence shows that the chemicals released when purging may make a person feel "high".{{Fact|date=August 2007}} This can also lead to extreme [[dehydration]] and electrolyte imbalances. |
|||
=== Interoceptive === |
|||
Some bulimics do not regard their cycles as a problem, while others despise and fear the vicious and uncontrollable cycle.<ref>http://www.edauk.com/sub_what_is_bulimia.htm</ref> Bulimics may appear underweight, normal weight or overweight. Bulimia can also take the form, more commonly, when the suffereer eats an average amount and again self-induces vomiting. |
|||
People with bulimia exhibit several [[Interoception|interoceptive]] deficits, in which one experiences impairment in recognizing and discriminating between internal sensations, feelings, and emotions.<ref name=Bow2015>{{cite journal| vauthors = Boswell JF, Anderson LM, Anderson DA |date=June 2015 |title=Integration of Interoceptive Exposure in Eating Disorder Treatment |journal=Clinical Psychology: Science and Practice|language=en|volume=22|issue=2|pages=194–210|doi=10.1111/cpsp.12103}}</ref> People with bulimia may also react negatively to [[Somatic nervous system|somatic]] and [[Affect (psychology)|affective]] states.<ref name=Bad2017>{{cite journal | vauthors = Badoud D, Tsakiris M | title = From the body's viscera to the body's image: Is there a link between interoception and body image concerns? | journal = Neuroscience and Biobehavioral Reviews | volume = 77 | pages = 237–246 | date = June 2017 | pmid = 28377099 | doi = 10.1016/j.neubiorev.2017.03.017 | s2cid = 768206 }}</ref> Regarding interoceptive sensation, hyposensitive individuals may not detect normal feelings of fullness at the appropriate time while eating, and are prone to eating more calories in a short period of time as a result of this decreased sensitivity.<ref name=Bow2015 /> |
|||
== Types == |
|||
There are two sub-types of bulimia nervosa: purging and non-purging. |
|||
Examining from a neural basis also connects elements of interoception and emotion; notable overlaps occur in the medial [[prefrontal cortex]], anterior and posterior [[Cingulate cortex|cingulate]], and anterior [[Insular cortex|insula cortices]], which are linked to both interoception and emotional eating.<ref name=Barret2015>{{cite journal | vauthors = Barrett LF, Simmons WK | title = Interoceptive predictions in the brain | journal = Nature Reviews. Neuroscience | volume = 16 | issue = 7 | pages = 419–29 | date = July 2015 | pmid = 26016744 | pmc = 4731102 | doi = 10.1038/nrn3950 }}</ref> |
|||
Purging type is the more common type of bulimia, and involves any of self-induced [[vomiting]], [[laxatives]], [[diuretics]], [[enemas]], or [[Syrup of ipecac|Ipecac]], to rapidly extricate the contents from their body.<ref>Durand, Mark, Barlow, David. "Essentials of Abnormal Psychology - Fourth Ed." Thomson Wadsworth, CA 2006, ISBN 0-534-60575-3</ref> |
|||
===Related disorders=== |
|||
Non-purging type occurs in only approximately 6%-8% of bulimia cases, as it is a less effective means of ridding the body of such a large number of calories. It involves doing excessive exercise or fasting after a binge, to counteract the large amount of calories previously ingested. This often occurs in purging-type bulimics, but is a secondary form of weight control.<ref>Durand, Mark, Barlow, David. "Essentials of Abnormal Psychology - Fourth Ed." Thomson Wadsworth, CA 2006, ISBN 0-534-60575-3</ref> |
|||
People with bulimia are at a higher risk to have an affective disorder, such as depression or general anxiety disorder. One study found 70% had depression at some time in their lives (as opposed to 26% for adult females in the general population), rising to 88% for all affective disorders combined.<ref>{{cite journal | vauthors = Walsh BT, Roose SP, Glassman AH, Gladis M, Sadik C | title = Bulimia and depression | journal = Psychosomatic Medicine | volume = 47 | issue = 2 | pages = 123–31 | year = 1985 | pmid = 3863157 | doi = 10.1097/00006842-198503000-00003 | s2cid = 12748691 }}</ref> Another study in the Journal of Affective Disorders found that of the population of patients that were diagnosed with an eating disorder according to the DSM-V guidelines about 27% also suffered from bipolar disorder. Within this article, the majority of the patients were diagnosed with bulimia nervosa, the second most common condition reported was binge-eating disorder.<ref>{{Cite journal |last1=McElroy |first1=Susan L. |last2=Crow |first2=Scott |last3=Blom |first3=Thomas J. |last4=Biernacka |first4=Joanna M. |last5=Winham |first5=Stacey J. |last6=Geske |first6=Jennifer |last7=Cuellar-Barboza |first7=Alfredo B. |last8=Bobo |first8=William V. |last9=Prieto |first9=Miguel L. |last10=Veldic |first10=Marin |last11=Mori |first11=Nicole |last12=Seymour |first12=Lisa R. |last13=Bond |first13=David J. |last14=Frye |first14=Mark A. |date=February 2016 |title=Prevalence and correlates of DSM-5 eating disorders in patients with bipolar disorder |url=https://linkinghub.elsevier.com/retrieve/pii/S016503271530519X |journal=Journal of Affective Disorders |language=en |volume=191 |pages=216–221 |doi=10.1016/j.jad.2015.11.010|pmid=26682490 }}</ref> Some individuals with anorexia nervosa exhibit episodes of bulimic tendencies through purging (either through self-induced vomiting or laxatives) as a way to quickly remove food in their system.<ref>Carlson, N.R., et al. (2007). Psychology: The Science of Behaviour – 4th Canadian ed. Toronto, ON: Pearson Education Canada.{{page needed|date=August 2013}}</ref> There may be an increased risk for [[diabetes mellitus type 2]].<ref>{{cite journal | vauthors = Nieto-Martínez R, González-Rivas JP, Medina-Inojosa JR, Florez H | title = Are Eating Disorders Risk Factors for Type 2 Diabetes? A Systematic Review and Meta-analysis | journal = Current Diabetes Reports | volume = 17 | issue = 12 | pages = 138 | date = November 2017 | pmid = 29168047 | doi = 10.1007/s11892-017-0949-1 | s2cid = 3688434 }}</ref> Bulimia also has negative effects on a person's teeth due to the acid passed through the mouth from frequent vomiting causing acid erosion, mainly on the posterior dental surface. |
|||
Research has shown that there is a relationship between bulimia and [[narcissism]].<ref name="pmid21184981">{{cite journal | vauthors = Maples J, Collins B, Miller JD, Fischer S, Seibert A | title = Differences between grandiose and vulnerable narcissism and bulimic symptoms in young women | journal = Eat Behav | volume = 12 | issue = 1 | pages = 83–5 | date = January 2011 | pmid = 21184981 | doi = 10.1016/j.eatbeh.2010.10.001 }}</ref><ref name="pmid9261656">{{cite journal | vauthors = Steiger H, Jabalpurwala S, Champagne J, Stotland S | title = A controlled study of trait narcissism in anorexia and bulimia nervosa | journal = Int J Eat Disord | volume = 22 | issue = 2 | pages = 173–8 | date = September 1997 | pmid = 9261656 | doi = 10.1002/(sici)1098-108x(199709)22:2<173::aid-eat9>3.0.co;2-c }}</ref><ref name="pmid9347071">{{cite journal | vauthors = Steinberg BE, Shaw RJ | title = Bulimia as a disturbance of narcissism: self-esteem and the capacity to self-soothe | journal = Addict Behav | volume = 22 | issue = 5 | pages = 699–710 | date = 1997 | pmid = 9347071 | doi = 10.1016/s0306-4603(97)00009-9 | s2cid = 25050604 }}</ref> According to a study by the [[Australian National University]], eating disorders are more susceptible among [[Vulnerable narcissism|vulnerable narcissists]]. This can be caused by a childhood in which inner feelings and thoughts were minimized by parents, leading to "a high focus on receiving validation from others to maintain a positive sense of self".<ref name="Sivanathan et al 2019">{{cite journal |vauthors=Sivanathan D, Bizumic B, Rieger E, Huxley E |date=December 2019 |title=Vulnerable narcissism as a mediator of the relationship between perceived parental invalidation and eating disorder pathology |journal=Eat Weight Disord |volume=24 |issue=6 |pages=1071–1077 |doi=10.1007/s40519-019-00647-2 |pmid=30725304 |s2cid=73416090}} |
|||
== Causes == |
|||
Bulimia is related to deep psychological issues and feelings of lack of control. Sufferers often use the destructive eating pattern to feel in control over their lives.<ref>[http://www.bbc.co.uk/health/conditions/mental_health/disorders_eating.shtml BBC - Health - Conditions - Eating disorders<!-- Bot generated title -->]</ref> They may hide or hoard food and overeat when stressed or upset. They may feel a loss of control during a binge, and consume great quantities of food (over 20,000 calories.)<ref>[http://www.at-risk.org/bulimia.html Bulimia<!-- Bot generated title -->]</ref> After a length of time, the sufferer of bulimia will find that they no longer have control over their binging and purging. The binging becomes an addiction that seems impossible to break. Recovery is very hard and often in the early stages of recovery the patient will gain weight as they are still binging but no longer purging, causing anxiety which will in turn cause the patient to revert back to bulimia. |
|||
* {{lay source|template=cite news|url=https://health.anu.edu.au/news-events/news/vulnerable-narcissists-more-susceptible-eating-disorders|title=Vulnerable narcissists more susceptible to eating disorders|website=ANU College of Health & Medicine}}</ref> |
|||
There are higher rates of eating disorders in groups involved in activities that emphasize thinness and body type, such as [[gymnastics]], dance, [[cheerleading]], acting and [[figure skating]].<ref>[http://www.healthsystem.virginia.edu/uvahealth/adult_mentalhealth/edbulim.cfm Bulimia Nervosa<!-- Bot generated title -->]</ref> Bulimia is more prevalent among [[Caucasian race|Caucasian]]s. In one study, diagnosis of bulimia was correlated with high [[testosterone]] and low [[estrogen]] levels, and normalizing these levels with [[combined oral contraceptive pill]]s reduced cravings for fat and sugar.<ref>[http://ki.se/ki/jsp/polopoly.jsp?d=130&a=22684&l=en&newsdep=130 Bulimia May Result from Hormonal Imbalance - Startpage - ki.se<!-- Bot generated title -->]</ref> |
|||
The medical journal ''Borderline Personality Disorder and Emotion Dysregulation'' notes that a "substantial rate of patients with bulimia nervosa" also have [[borderline personality disorder]].<ref name="bpded.biomedcentral.com">{{cite journal |last1=Hessler |first1=Johannes Baltasar |last2=Heuser |first2=Jörg |last3=Schlegl |first3=Sandra |last4=Bauman |first4=Tabea |last5=Greetfeld |first5=Martin |last6=Voderholzer |first6=Ulrich |year=2019 |title=Impact of comorbid borderline personality disorder on inpatient treatment for bulimia nervosa: Analysis of routine data |journal=Borderline Personality Disorder and Emotion Dysregulation |volume=6 |page=1 |doi=10.1186/s40479-018-0098-4 |pmc=6335811 |pmid=30680217 |doi-access=free}}</ref> |
|||
== Consequences == |
|||
Bulimia can cause following health problems: |
|||
* [[Malnutrition]] |
|||
* [[Dehydration]] |
|||
* [[Electrolyte]] imbalance, which can cause [[cardiac arrest]] or brain damage from a [[stroke]] |
|||
* [[Hyponatremia]] |
|||
* Damaging of the voice |
|||
* [[Vitamin]] and mineral deficiencies |
|||
* [[Teeth]] erosion and cavities, [[gum disease]] |
|||
* Salivary gland swelling ([[sialadenosis]]) |
|||
* Potential for [[gastric]] rupture during periods of [[binging]] |
|||
* [[Esophageal reflux]] |
|||
* Irritation, [[inflammation]], and possible rupture of the [[esophagus]] |
|||
* [[Laxative]] dependence |
|||
* [[Peptic ulcer]]s and [[pancreatitis]] |
|||
* [[Emetic]] toxicity due to ipecac abuse |
|||
* Swelling of the face and cheeks, especially the lower eyelids, due to the high pressure of blood in the face during vomiting; for the same reason [[Purpura]] can occur, a rash caused by burst blood vessels. |
|||
* [[Callus]]ed or bruised fingers |
|||
* Dry or brittle skin, hair, and nails, or hair loss |
|||
* [[Lanugo]] |
|||
* [[Edema]] |
|||
* [[Muscle atrophy]] |
|||
* Decreased or increased bowel activity |
|||
* Digestive problems that may be triggered, including [[celiac]] and [[Crohn's disease]] |
|||
* Low blood pressure ([[hypotension]]) |
|||
** [[Orthostatic hypotension]] |
|||
* High blood pressure ([[hypertension]]) |
|||
* [[iron deficiency (medicine)|Iron deficiency]] |
|||
* [[Anemia]] |
|||
* Hormonal imbalances |
|||
* [[Hyperactivity]] |
|||
* [[Depression (mood)|Depression]] |
|||
* [[Insomnia]] |
|||
* [[Amenorrhea]] |
|||
* [[Infertility]] |
|||
* High risk pregnancy, [[miscarriage]], still-born babies |
|||
* [[Diabetes]] |
|||
* High blood sugar ([[hyperglycemia]]) |
|||
* [[Ketoacidosis]] |
|||
* [[Osteoporosis]] |
|||
* [[Arthritis]] |
|||
* [[Russell's sign]] (scarring on the knuckles or back of the hand due to self-induced vomiting over long periods of time) |
|||
* Weakness and fatigue also along with depression |
|||
* Cancer of the throat or cancer of the voice box |
|||
* Liver failure |
|||
* Kidney infection and failure |
|||
* Heart failure, [[cardiac arrhythmia|heart arrhythmia]], angina |
|||
* Seizure |
|||
* Paralysis |
|||
* [[Death]] caused by heart attack or heart failure; lung collapse; internal bleeding, stroke, kidney failure, liver failure; pancreatitis, gastric rupture, perforated ulcer, depression and suicide. |
|||
A study by the Psychopharmacology Research Program of the [[University of Cincinnati College of Medicine]] "leaves little doubt that [[Bipolar disorder|bipolar]] and eating disorders—particularly bulimia nervosa and bipolar II disorder—are related." The research shows that most clinical studies indicate that patients with bipolar disorder have higher rates of eating disorders, and vice versa. There is overlap in phenomenology, course, comorbidity, family history, and pharmacologic treatment response of these disorders. This is especially true of "eating dysregulation, mood dysregulation, impulsivity and compulsivity, craving for activity and/or exercise."<ref name="McElroy et al 2005">{{cite journal |vauthors=McElroy SL, Kotwal R, Keck PE, Akiskal HS |date=June 2005 |title=Comorbidity of bipolar and eating disorders: distinct or related disorders with shared dysregulations? |journal=J Affect Disord |volume=86 |issue=2–3 |pages=107–27 |doi=10.1016/j.jad.2004.11.008 |pmid=15935230}}</ref> |
|||
== Related psychological disorders == |
|||
Many bulimics also have anxiety or mood disorders. One study found anxiety in 75% of bulimic have been previously misdiagnosed with mood disorders. After appropriate treatment for an eating disorder, symptoms once thought be the result of bi-polar disorder, depression or anxiety disorder for examples eventually subside along with the eating disorder itself. Prominent mood disorders include depression and substance abuse. Some experts are finding in some individuals that their depression was caused by the eating disorder itself.<ref>{{cite book |last=Durand |first=Mark |coauthors=Barlow, David |title=Essentials of Abnormal Psychology |edition=Fourth Edition |publisher=Thomson |location=Wadsworth, CA |year=2006 |isbn=0534605753 |oclc=61458584}}</ref> To make patient history, treatment and prognosis even more baffling, many professionals intentionally exaggerate the severity of symptoms, even adding on a mood disorder diagnosis when none is warranted, in order to increase the likelihood of insurance coverage. Most insurance companies will cover inpatient treatment for severe mood disorders but not for eating disorders alone. |
|||
Studies have shown a relationship between bulimia's effect on metabolic rate and caloric intake with [[thyroid dysfunction]].<ref name="pmid8817724">{{cite journal | vauthors = Altemus M, Hetherington M, Kennedy B, Licinio J, Gold PW | title = Thyroid function in bulimia nervosa | journal = Psychoneuroendocrinology | volume = 21 | issue = 3 | pages = 249–61 | date = April 1996 | pmid = 8817724 | doi = 10.1016/0306-4530(96)00002-9 | s2cid=24919021 }}</ref> |
|||
Bulimics are also more likely to attempt suicide and engage in impulsive behaviors. Bulimic females typically have a less favorable opinion of themselves than [[Scientific control|control groups]]. They are more [[pessimistic]], more ambivalent towards others, strive for less recognition in areas that are socially significant or require leadership. Many bulimics, like anorexics, binge eaters and others with eating disorders, at one time were considered over-acheivers, highly intelligent and true rising stars among their peers. Yet, bulimics eventually become so consumed by food and/or weight that they, like anorexics, binge eaters and other individuals with eating disorders, have little time for the normal ambitions they once had. |
|||
Scientific research has shown that people suffering from bulimia have decreased volumes of brain matter, and that the abnormalities are reversible after long-term recovery.<ref>{{Cite journal |last1=Wagner |first1=Angela |last2=Greer |first2=Phil |last3=Bailer |first3=Ursula F. |last4=Frank |first4=Guido K. |last5=Henry |first5=Shannan E. |last6=Putnam |first6=Karen |last7=Meltzer |first7=Carolyn C. |last8=Ziolko |first8=Scott K. |last9=Hoge |first9=Jessica |last10=McConaha |first10=Claire |last11=Kaye |first11=Walter H. |date=2006-02-01 |title=Normal Brain Tissue Volumes after Long-Term Recovery in Anorexia and Bulimia Nervosa |url=https://linkinghub.elsevier.com/retrieve/pii/S0006322305007651 |journal=Biological Psychiatry |language=en |volume=59 |issue=3 |pages=291–293 |doi=10.1016/j.biopsych.2005.06.014|pmid=16139807 }}</ref> |
|||
==Causes== |
|||
===Biological=== |
|||
As with [[anorexia nervosa]], there is evidence of genetic predispositions contributing to the onset of this eating disorder.<ref>{{cite web|title=Biological Causes of Anorexia Nervosa and Bulimia Nervosa|url=http://serendip.brynmawr.edu/bb/neuro/neuro98/202s98-paper3/Hirst3.html|access-date=July 4, 2016|archive-url=https://web.archive.org/web/20160502145058/http://serendip.brynmawr.edu/bb/neuro/neuro98/202s98-paper3/Hirst3.html|archive-date=May 2, 2016|url-status=dead}}</ref> Abnormal levels of many hormones, notably [[serotonin]], have been shown to be responsible for some disordered eating behaviors. [[Brain-derived neurotrophic factor]] (BDNF) is under investigation as a possible mechanism.<ref>{{cite journal | vauthors = Ribasés M, Gratacòs M, Fernández-Aranda F, Bellodi L, Boni C, Anderluh M, Cavallini MC, Cellini E, Di Bella D, Erzegovesi S, Foulon C, Gabrovsek M, Gorwood P, Hebebrand J, Hinney A, Holliday J, Hu X, Karwautz A, Kipman A, Komel R, Nacmias B, Remschmidt H, Ricca V, Sorbi S, Wagner G, Treasure J, Collier DA, Estivill X | display-authors = 6 | title = Association of BDNF with anorexia, bulimia and age of onset of weight loss in six European populations | journal = Human Molecular Genetics | volume = 13 | issue = 12 | pages = 1205–12 | date = June 2004 | pmid = 15115760 | doi = 10.1093/hmg/ddh137 | doi-access = free }}</ref><ref>{{cite book|title=Annual Review of Eating Disorders – part 2 |year=2018 |veditors = Wonderlich S, Mitchell JE, de Zwaan M, Steiger H|publisher=Radcliffe Publishing|pages=14–15|chapter=Psychobiology of eating disorders |chapter-url=https://books.google.com/books?id=3UxWDwAAQBAJ&pg=PT15 |isbn=978-1-84619-244-9}}</ref> |
|||
There is evidence that sex hormones may influence appetite and eating in women and the onset of bulimia nervosa. Studies have shown that women with [[hyperandrogenism]] and [[polycystic ovary syndrome]] have a dysregulation of appetite, along with carbohydrates and fats. This dysregulation of appetite is also seen in women with bulimia nervosa. In addition, gene knockout studies in mice have shown that mice that have the gene encoding [[estrogen]] receptors have decreased fertility due to ovarian dysfunction and dysregulation of [[androgen]] receptors. In humans, there is evidence that there is an association between polymorphisms in the ERβ ([[estrogen receptor]] β) and bulimia, suggesting there is a correlation between sex hormones and bulimia nervosa.<ref>{{cite journal | vauthors = Hirschberg AL | title = Sex hormones, appetite and eating behaviour in women | journal = Maturitas | volume = 71 | issue = 3 | pages = 248–56 | date = March 2012 | pmid = 22281161 | doi = 10.1016/j.maturitas.2011.12.016 }}</ref> |
|||
Bulimia has been compared to drug addiction, though the empirical support for this characterization is limited.<ref>{{cite journal | vauthors = Broft A, Shingleton R, Kaufman J, Liu F, Kumar D, Slifstein M, Abi-Dargham A, Schebendach J, Van Heertum R, Attia E, Martinez D, Walsh BT | display-authors = 6 | title = Striatal dopamine in bulimia nervosa: a PET imaging study | journal = The International Journal of Eating Disorders | volume = 45 | issue = 5 | pages = 648–56 | date = July 2012 | pmid = 22331810 | pmc = 3640453 | doi = 10.1002/eat.20984 }}</ref> However, people with bulimia nervosa may share dopamine D2 receptor-related vulnerabilities with those with [[substance use disorder]]s.<ref>{{cite journal | vauthors = Kaye WH, Wierenga CE, Bailer UF, Simmons AN, Wagner A, Bischoff-Grethe A | title = Does a shared neurobiology for foods and drugs of abuse contribute to extremes of food ingestion in anorexia and bulimia nervosa? | journal = Biological Psychiatry | volume = 73 | issue = 9 | pages = 836–42 | date = May 2013 | pmid = 23380716 | pmc = 3755487 | doi = 10.1016/j.biopsych.2013.01.002 }}</ref> |
|||
Dieting, a common behaviour in bulimics, is associated with lower plasma tryptophan levels.<ref>{{cite journal | vauthors = Strasser B, Fuchs D | title = Diet Versus Exercise in Weight Loss and Maintenance: Focus on Tryptophan | journal = International Journal of Tryptophan Research | volume = 9 | pages = 9–16 | year = 2016 | pmid = 27199566 | pmc = 4864009 | doi = 10.4137/IJTR.S33385 }}</ref> Decreased tryptophan levels in the brain, and thus the synthesis of serotonin, such as via [[acute tryptophan depletion]], increases bulimic urges in currently and formerly bulimic individuals within hours.<ref>{{cite journal | vauthors = Smith KA, Fairburn CG, Cowen PJ | title = Symptomatic relapse in bulimia nervosa following acute tryptophan depletion | journal = Archives of General Psychiatry | volume = 56 | issue = 2 | pages = 171–6 | date = February 1999 | pmid = 10025442 | doi = 10.1001/archpsyc.56.2.171 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Weltzin TE, Fernstrom MH, Fernstrom JD, Neuberger SK, Kaye WH | title = Acute tryptophan depletion and increased food intake and irritability in bulimia nervosa | journal = The American Journal of Psychiatry | volume = 152 | issue = 11 | pages = 1668–71 | date = November 1995 | pmid = 7485633 | doi = 10.1176/ajp.152.11.1668 }}</ref> |
|||
Abnormal blood levels of peptides important for the regulation of appetite and energy balance are observed in individuals with bulimia nervosa, but it remains unknown if this is a state or trait.<ref>{{cite journal | vauthors = Tortorella A, Brambilla F, Fabrazzo M, Volpe U, Monteleone AM, Mastromo D, Monteleone P | title = Central and peripheral peptides regulating eating behaviour and energy homeostasis in anorexia nervosa and bulimia nervosa: a literature review | journal = European Eating Disorders Review | volume = 22 | issue = 5 | pages = 307–20 | date = September 2014 | pmid = 24942507 | doi = 10.1002/erv.2303 }}</ref> |
|||
In recent years, [[evolutionary psychiatry]] as an emerging scientific discipline has been studying [[mental disorder]]s from an evolutionary perspective. If eating disorders, Bulimia nervosa in particular, have evolutionary functions or if they are new modern "lifestyle" problems is still debated.<ref name="pmid9875960">{{cite journal | vauthors = Abed RT | title = The sexual competition hypothesis for eating disorders | journal = Br J Med Psychol | volume = 71 ( Pt 4) | issue = 4| pages = 525–47 | date = December 1998 | pmid = 9875960 | doi = 10.1111/j.2044-8341.1998.tb01007.x }}</ref><ref name="pmid30429818">{{cite journal | vauthors = Nettersheim J, Gerlach G, Herpertz S, Abed R, Figueredo AJ, Brüne M | title = Evolutionary Psychology of Eating Disorders: An Explorative Study in Patients With Anorexia Nervosa and Bulimia Nervosa | journal = Front Psychol | volume = 9 | issue = | pages = 2122 | date = 2018 | pmid = 30429818 | pmc = 6220092 | doi = 10.3389/fpsyg.2018.02122 | doi-access=free }}</ref><ref>{{cite book |vauthors = Nesse RM |title=Good reasons for bad feelings: insights from the frontier of evolutionary psychiatry |date=2020 |publisher=Penguin Books, Limited |isbn=978-0-14-198491-9 |oclc=1100591660 }}{{page needed|date=July 2021}}</ref> |
|||
===Social=== |
|||
Media portrayals of an 'ideal' body shape are widely considered to be a contributing factor to bulimia.<ref name=Barker03/> In a 1991 study by Weltzin, Hsu, Pollicle, and Kaye, it was stated that 19% of bulimics undereat, 37% of bulimics eat an average or normal amount of food, and 44% of bulimics overeat.<ref>{{cite book |title=Psychology: the science of behaviour |edition=4th Canadian |first1=Neil R. |last1=Carlson |first2=William |last2=Buskist |first3=C. Donald |last3=Heth |first4=Rod |last4=Schmaltz | name-list-style = vanc |year=2010 |publisher=Pearson Education Canada |location=Toronto |isbn=978-0-205-70286-2 |page=415 <!-- Updated info from http://catalogue.pearsoned.ca/product?ISBN=9780205702862 -->}}</ref> A survey of 15- to 18-year-old high school girls in [[Nadroga-Navosa Province|Nadroga]], [[Fiji]], found the self-reported incidence of purging rose from 0% in 1995 (a few weeks after the introduction of television in the province) to 11.3% in 1998.<ref>{{cite journal | vauthors = Becker AE, Burwell RA, Gilman SE, Herzog DB, Hamburg P | title = Eating behaviours and attitudes following prolonged exposure to television among ethnic Fijian adolescent girls | journal = The British Journal of Psychiatry | volume = 180 | issue = 6 | pages = 509–14 | date = June 2002 | pmid = 12042229 | doi = 10.1192/bjp.180.6.509 | doi-access = free }}</ref> In addition, the suicide rate among people with bulimia nervosa is 7.5 times higher than in the general population.<ref>Nolen-Hoeksema, Susan (2014). [http://connect.mheducation.com/connect/hmEBook.do?setTab=sectionTabs "Bulimia Nervosa"] ''Abnormal Psychology''. 6e. pg 344.</ref> |
|||
When attempting to decipher the origin of bulimia nervosa in a cognitive context, [[Christopher Fairburn]] ''et al.''{{'}}s cognitive-behavioral model is often considered the golden standard.<ref>{{cite journal | vauthors = Cooper Z, Fairburn CG | title = The Evolution of "Enhanced" Cognitive Behavior Therapy for Eating Disorders: Learning From Treatment Nonresponse | journal = Cognitive and Behavioral Practice | year=2013 | volume = 18 | issue = 3 | pages = 394–402 | doi = 10.1016/j.cbpra.2010.07.007 | pmid = 23814455| pmc = 3695554 }}</ref> Fairburn et al.'s model discusses the process in which an individual falls into the binge-purge cycle and thus develops bulimia. Fairburn ''et al.'' argue that extreme concern with weight and shape coupled with low self-esteem will result in strict, rigid, and inflexible dietary rules. Accordingly, this would lead to unrealistically restricted eating, which may consequently induce an eventual "slip" where the individual commits a minor infraction of the strict and inflexible dietary rules. Moreover, the cognitive distortion due to [[dichotomy|dichotomous]] thinking leads the individual to binge. The binge subsequently should trigger a perceived loss of control, promoting the individual to purge in hope of counteracting the binge. However, Fairburn ''et al.'' assert the cycle repeats itself, and thus consider the binge-purge cycle to be self-perpetuating.<ref>{{cite journal | vauthors = Fairburn CG, Beglin SJ | title = Studies of the epidemiology of bulimia nervosa | journal = The American Journal of Psychiatry | volume = 147 | issue = 4 | pages = 401–8 | date = April 1990 | pmid = 2180327 | doi = 10.1176/ajp.147.4.401 }}</ref> |
|||
In contrast, Byrne and Mclean's findings differed slightly from Fairburn ''et al.''{{'}}s cognitive-behavioral model of bulimia nervosa in that the drive for thinness was the major cause of purging as a way of controlling weight. In turn, Byrne and Mclean argued that this makes the individual vulnerable to binging, indicating that it is not a binge-purge cycle but rather a purge-binge cycle in that purging comes before bingeing. Similarly, Fairburn ''et al.''{{'}}s cognitive-behavioral model of bulimia nervosa is not necessarily applicable to every individual and is certainly reductionist. Every one differs from another, and taking such a complex behavior like bulimia and applying the same one theory to everyone would certainly be invalid. In addition, the cognitive-behavioral model of bulimia nervosa is very culturally bound in that it may not be necessarily applicable to cultures outside of Western society. To evaluate, Fairburn ''et al.''.'s model and more generally the cognitive explanation of bulimia nervosa is more descriptive than explanatory, as it does not necessarily explain how bulimia arises. Furthermore, it is difficult to ascertain cause and effect, because it may be that distorted eating leads to distorted cognition rather than vice versa.<ref>{{cite book|last=Trull|first=Thimothy| name-list-style = vanc |title=Abnormal Psychology and Life: A Dimensional Approach|publisher=Wadsworth, Cengage Learning|location=Belmont CA|isbn=978-1-111-34376-7|pages=236–8|url=https://books.google.com/books?id=0kEcIFJUk64C&pg=PA236|date=2010-10-08|url-status=live|archive-url=https://web.archive.org/web/20160207044917/https://books.google.com/books?id=0kEcIFJUk64C&pg=PA236|archive-date=2016-02-07}}</ref><ref>{{cite journal | vauthors = Byrne SM, McLean NJ | title = The cognitive-behavioral model of bulimia nervosa: a direct evaluation | journal = The International Journal of Eating Disorders | volume = 31 | issue = 1 | pages = 17–31 | date = January 2002 | pmid = 11835294 | doi = 10.1002/eat.10002 }}</ref> |
|||
A considerable amount of literature has identified a correlation between sexual abuse and the development of bulimia nervosa. The reported incident rate of unwanted sexual contact is higher among those with bulimia nervosa than anorexia nervosa.<ref>{{cite journal | vauthors = Waller G | title = Sexual abuse and the severity of bulimic symptoms | journal = The British Journal of Psychiatry | volume = 161 | pages = 90–3 | date = July 1992 | pmid = 1638336 | doi = 10.1192/bjp.161.1.90 | s2cid = 39739310 }}</ref> |
|||
When exploring the etiology of bulimia through a socio-cultural perspective, the "thin ideal internalization" is significantly responsible. The thin-ideal internalization is the extent to which individuals adapt to the societal ideals of attractiveness. Studies have shown that young women that read fashion magazines tend to have more bulimic symptoms than those women who do not. This further demonstrates the impact of media on the likelihood of developing the disorder.<ref name=Abnormal>{{cite book|last=Nolen-Hoeksema|first=Susan| name-list-style = vanc |title=(Ab)normal Psychology|date=2013|publisher=McGraw Hill|isbn=978-0078035388|page=338}}</ref> Individuals first accept and "buy into" the ideals, and then attempt to transform themselves in order to reflect the societal ideals of attractiveness. J. Kevin Thompson and Eric Stice claim that family, peers, and most evidently media reinforce the thin ideal, which may lead to an individual accepting and "buying into" the thin ideal. In turn, Thompson and Stice assert that if the thin ideal is accepted, one could begin to feel uncomfortable with their body shape or size since it may not necessarily reflect the thin ideal set out by society. Thus, people feeling uncomfortable with their bodies may result in body dissatisfaction and may develop a certain drive for thinness. Consequently, body dissatisfaction coupled with a drive for thinness is thought to promote dieting and negative effects, which could eventually lead to bulimic symptoms such as purging or bingeing. Binges lead to self-disgust which causes purging to prevent weight gain.<ref>{{cite web|last=Zieve|first=David| name-list-style = vanc |title=Bulimia|url=https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001381/|publisher=PubMed Health|access-date=April 18, 2011|url-status=live|archive-url=https://web.archive.org/web/20110211185310/http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001381|archive-date=February 11, 2011}}</ref> |
|||
A study dedicated to investigating the thin ideal internalization as a factor of bulimia nervosa is Thompson's and Stice's research. Their study aimed to investigate how and to what degree media affects the thin ideal internalization. Thompson and Stice used randomized experiments (more specifically programs) dedicated to teaching young women how to be more critical when it comes to media, to reduce thin-ideal internalization. The results showed that by creating more awareness of the media's control of the societal ideal of attractiveness, the thin ideal internalization significantly dropped. In other words, less thin ideal images portrayed by the media resulted in less thin-ideal internalization. Therefore, Thompson and Stice concluded that media greatly affected the thin ideal internalization.<ref name="Sage journals online">{{cite journal |doi=10.1111/1467-8721.00144 |title=Thin-Ideal Internalization: Mounting Evidence for a New Risk Factor for Body-Image Disturbance and Eating Pathology |year=2001 |last1=Thompson |first1=J. Kevin |last2=Stice |first2=Eric| name-list-style = vanc |journal=Current Directions in Psychological Science |volume=10 |issue=5 |pages=181–3 |jstor=20182734|s2cid=20401750 }}</ref> Papies showed that it is not the thin ideal itself, but rather the self-association with other persons of a certain weight that decide how someone with bulimia nervosa feels. People that associate themselves with thin models get in a positive attitude when they see thin models and people that associate with overweight get in a negative attitude when they see thin models. Moreover, it can be taught to associate with thinner people.<ref name="Papies">{{cite journal | vauthors = Papies EK, Nicolaije KA | title = Inspiration or deflation? Feeling similar or dissimilar to slim and plus-size models affects self-evaluation of restrained eaters | journal = Body Image | volume = 9 | issue = 1 | pages = 76–85 | date = January 2012 | pmid = 21962524 | doi = 10.1016/j.bodyim.2011.08.004 }}</ref> |
|||
==Diagnosis== |
|||
The onset of bulimia nervosa is often during adolescence, between 13 and 20 years of age, and many cases have previously experienced obesity, with many relapsing in adulthood into episodic bingeing and purging even after initially successful treatment and remission.<ref>{{Cite book|last=Shader |first=Richard I. | name-list-style = vanc |title=Manual of Psychiatric Therapeutics |publisher=Lippincott Williams & Wilkins |location=Hagerstwon, MD |year=2004 |isbn=978-0-7817-4459-1}}{{Page needed|date=September 2010}}</ref> A lifetime [[prevalence]] of 0.5 percent and 0.9 percent for adults and adolescents, respectively, is estimated among the United States population.<ref>[Nolen-Hoeksema, S. (2013)."(Ab)normal Psychology"(6th edition). McGraw-Hill. p.344]</ref> Bulimia nervosa may affect up to 1% of young women and, after 10 years of diagnosis, half will recover fully, a third will recover partially, and 10–20% will still have symptoms.<ref name=Hay2010/> |
|||
Adolescents with bulimia nervosa are more likely to have self-imposed [[Perfectionism (psychology)|perfectionism]] and compulsivity issues in eating compared to their peers. This means that the high expectations and unrealistic goals that these individuals set for themselves are internally motivated rather than by social views or expectations.<ref>{{cite journal | vauthors = Castro-Fornieles J, Gual P, Lahortiga F, Gila A, Casulà V, Fuhrmann C, Imirizaldu M, Saura B, Martínez E, Toro J | display-authors = 6 | title = Self-oriented perfectionism in eating disorders | journal = The International Journal of Eating Disorders | volume = 40 | issue = 6 | pages = 562–8 | date = September 2007 | pmid = 17510925 | doi = 10.1002/eat.20393 }}</ref> |
|||
===Criteria=== |
|||
Bulimia Nervosa is diagnosed using the ''Diagnostic and Statistical Manual of Mental Disorders (DSM-5).'' The diagnostic criteria includes the following:<ref name=":1" /><ref>{{Cite journal |last1=Harrington |first1=Brian C. |last2=Jimerson |first2=Michelle |last3=Haxton |first3=Christina |last4=Jimerson |first4=David C. |date=2015-01-01 |title=Initial Evaluation, Diagnosis, and Treatment of Anorexia Nervosa and Bulimia Nervosa |url=https://www.aafp.org/pubs/afp/issues/2015/0101/p46.html |journal=American Family Physician |language=en-US |volume=91 |issue=1 |pages=46–52|pmid=25591200 }}</ref> |
|||
* Recurrent episodes of binge eating |
|||
* Recurrent inappropriate compensatory behavior to prevent weight gain, like self-induced vomiting, misuse of laxatives or other medications, fasting, or excessive exercise. |
|||
* The binge eating and compensatory behaviors both occur at least once a week for three months |
|||
* Self-evaluation is influenced by body shape and weight. |
|||
Other methods are also used to narrow down the diagnosis, including: |
|||
* Physical exams: May include measuring your height and weight, checking vital signs, checking skin and nails, and listening to the heart and lungs. |
|||
* Lab tests: May include a complete blood count, tests to check electrolytes and protein, or a urinalysis might be performed. |
|||
* Psychological evaluations: A therapist or mental health provider will likely inquire about your thoughts, feelings, and eating habits, as well as asking you to complete a questionnaire. |
|||
==Treatment== |
|||
There are two main types of treatment given to those with bulimia nervosa; psychopharmacological and psychosocial treatments.<ref>{{cite journal |vauthors=Hoste RR, Labuschagne Z, Le Grange D |title=Adolescent bulimia nervosa |journal=Current Psychiatry Reports |volume=14 |issue=4 |pages=391–7 |date=August 2012 |pmid=22614677 |doi=10.1007/s11920-012-0280-0 |s2cid=36665983}}</ref> |
|||
===Psychotherapy=== |
|||
[[Cognitive behavioral therapy]] (CBT) is considered the gold standard for the treatment of bulimia nervosa. This approach focuses on helping patients identify and change distorted thought patterns related to eating, body image, and self worth<ref name=":2">{{Cite journal |last=Hay |first=Phillipia |date=Jul 19, 2010 |title=Bulimia Nervosa |journal=BMJ Clinical Evidence |page=1009 |pmid=21418667 |pmc=3275326 }}</ref><ref name=":3">{{Cite journal |last1=Hagan |first1=Kelsey E. |last2=Walsh |first2=B. Timothy |date=2021-01-01 |title=State of the Art: The Therapeutic Approaches to Bulimia Nervosa |journal=Clinical Therapeutics |volume=43 |issue=1 |pages=40–49 |doi=10.1016/j.clinthera.2020.10.012 |pmid=33358256 |pmc=7902447 |issn=0149-2918}}</ref> |
|||
CBT helps patients identify and challenge the distorted thinking individuals might have about food, weight and body image. It also helps by offering the chance to identify the unhelpful thoughts about food and body image.<ref name=":3" /> |
|||
By using CBT people record how much food they eat and periods of vomiting with the purpose of identifying and avoiding emotional fluctuations that bring on episodes of bulimia on a regular basis, as a component of this therapy is food journaling.<ref name="Psychiatry"/> CBT is necessarily good for those with bulimia as it targets the binge-purge cycle, which is the hallmark of bulimia.<ref name=":0" /><ref>{{cite journal | vauthors = Agras WS, Crow SJ, Halmi KA, Mitchell JE, Wilson GT, Kraemer HC | title = Outcome predictors for the cognitive behavior treatment of bulimia nervosa: data from a multisite study | journal = The American Journal of Psychiatry | volume = 157 | issue = 8 | pages = 1302–8 | date = August 2000 | pmid = 10910795 | doi = 10.1176/appi.ajp.157.8.1302 }}</ref><ref>{{cite journal | vauthors = Wilson GT, Loeb KL, Walsh BT, Labouvie E, [[Eva Petkova|Petkova E]], Liu X, Waternaux C | title = Psychological versus pharmacological treatments of bulimia nervosa: predictors and processes of change | journal = Journal of Consulting and Clinical Psychology | volume = 67 | issue = 4 | pages = 451–9 | date = August 1999 | pmid = 10450615 | doi = 10.1037/0022-006X.67.4.451 | citeseerx = 10.1.1.583.7568 }}</ref> People undergoing CBT who exhibit early behavioral changes are most likely to achieve the best treatment outcomes in the long run.<ref>{{cite journal | vauthors = Trunko ME, Rockwell RE, Curry E, Runfola C, Kaye WH | title = Management of bulimia nervosa | journal = Women's Health | volume = 3 | issue = 2 | pages = 255–65 | date = March 2007 | pmid = 19803857 | doi = 10.2217/17455057.3.2.255 | doi-access = free }}</ref> |
|||
Researchers have also reported some positive outcomes for [[interpersonal psychotherapy]] and [[dialectical behavior therapy]].<ref>{{cite journal | vauthors = Fairburn CG, Agras WS, Walsh BT, Wilson GT, Stice E | title = Prediction of outcome in bulimia nervosa by early change in treatment | journal = The American Journal of Psychiatry | volume = 161 | issue = 12 | pages = 2322–4 | date = December 2004 | pmid = 15569910 | doi = 10.1176/appi.ajp.161.12.2322 }}</ref><ref>{{cite journal | vauthors = Safer DL, Telch CF, Agras WS | title = Dialectical behavior therapy for bulimia nervosa | journal = The American Journal of Psychiatry | volume = 158 | issue = 4 | pages = 632–4 | date = April 2001 | pmid = 11282700 | doi = 10.1176/appi.ajp.158.4.632 }}</ref> These therapies have good outcomes for treating bulimia, especially in patients with emotional regulation difficulties or interpersonal issues. While these therapies are not as extensively research as CBT, they can be beneficial when integrated into a comprehensive treatment plan.<ref name=":2" /> |
|||
For adolescents, Family-Based therapy (FBT) has been identified as an effective treatment. FBT involes the family in the treatment process, where parents are empowered to take an active role in helping their child recover from bulimia nervosa. This approach is particularly helpful in younger patients who are still living with their families<ref name=":2" /> |
|||
The use of CBT has been shown to be quite effective for treating bulimia nervosa (BN) in adults, but little research has been done on effective treatments of BN for adolescents.<ref name="ReferenceB">{{cite journal | vauthors = Keel PK, Haedt A | title = Evidence-based psychosocial treatments for eating problems and eating disorders | journal = Journal of Clinical Child and Adolescent Psychology | volume = 37 | issue = 1 | pages = 39–61 | date = January 2008 | pmid = 18444053 | doi = 10.1080/15374410701817832 | s2cid = 16098576 | citeseerx = 10.1.1.822.6191 }}</ref> Although CBT is seen as more cost-efficient and helps individuals with BN in self-guided care, Family Based Treatment (FBT) might be more helpful to younger adolescents who need more support and guidance from their families.<ref>{{cite journal | vauthors = Nadeau PO, Leichner P | title = Treating Bulimia in Adolescents: A Family-Based Approach | journal = Journal of the Canadian Academy of Child and Adolescent Psychiatry | date= February 2009 | volume = 18 | issue = 1 | pages = 67–68 | pmc = 2651218 }}</ref> Adolescents are at the stage where their brains are still quite malleable and developing gradually.<ref>{{cite journal | vauthors = Le Grange D, Lock J, Dymek M | title = Family-based therapy for adolescents with bulimia nervosa | journal = American Journal of Psychotherapy | volume = 57 | issue = 2 | pages = 237–51 | year = 2003 | pmid = 12817553 | doi = 10.1176/appi.psychotherapy.2003.57.2.237 | doi-access = free}}</ref> Therefore, young adolescents with BN are less likely to realize the detrimental consequences of becoming bulimic and have less motivation to change,<ref>{{cite journal | vauthors = Castro-Fornieles J, Bigorra A, Martinez-Mallen E, Gonzalez L, Moreno E, Font E, Toro J | title = Motivation to change in adolescents with bulimia nervosa mediates clinical change after treatment | journal = European Eating Disorders Review | volume = 19 | issue = 1 | pages = 46–54 | year = 2011 | pmid = 20872926 | doi = 10.1002/erv.1045}}</ref> which is why FBT would be useful to have families intervene and support the teens.<ref name="ReferenceB" /> Working with BN patients and their families in FBT can empower the families by having them involved in their adolescent's food choices and behaviors, taking more control of the situation in the beginning and gradually letting the adolescent become more autonomous when they have learned healthier eating habits.<ref name="ReferenceB" /> |
|||
===Medication=== |
|||
Antidepressants, particularly [[selective serotonin reuptake inhibitor]]s (SSRI), are often prescribed to treat bulimia nervosa, especially when comorbid depression or anxiety disorders are present. However, medications alone are generally not sufficient and are typically used in conjunction with psychotherapy<ref name=":1" /><ref name=":2" /> Compared to placebo, the use of a single antidepressant has been shown to be effective.<ref name="pmid14583971">{{cite journal | vauthors = Bacaltchuk J, Hay P | title = Antidepressants versus placebo for people with bulimia nervosa | journal = Cochrane Database Syst Rev | volume = | issue = 4 | pages = CD003391 | date = 2003 | pmid = 14583971 | doi = 10.1002/14651858.CD003391 | pmc = 6991155}}</ref> Combining medication with counseling can improve outcomes in some circumstances.<ref>{{cite journal | vauthors = Bacaltchuk J, Hay P, Trefiglio R | title = Antidepressants versus psychological treatments and their combination for bulimia nervosa | journal = The Cochrane Database of Systematic Reviews | issue = 4 | pages = CD003385 | date = 2001 | volume = 2001 | pmid = 11687197 | pmc = 6999807 | doi = 10.1002/14651858.CD003385}}</ref> Some positive outcomes of treatments can include: abstinence from binge eating, a decrease in obsessive behaviors to lose weight and in shape preoccupation, less severe psychiatric symptoms, a desire to counter the effects of binge eating, as well as an improvement in social functioning and reduced relapse rates.<ref name=Hay2010/> |
|||
A combination of psychotherapy, especially CBT and pharmacological treatments, such as SSRIs, often lead to better outcomes for individuals with bulimia. Combining both approaches is particularly beneficial in severe or chronic cases, where behavioral modification and mood stabilization are crucial.<ref name=":2" /> |
|||
===Alternative medicine=== |
|||
Some researchers have also claimed positive outcomes in [[hypnotherapy]].<ref>{{cite journal | vauthors = Barabasz M | title = Efficacy of hypnotherapy in the treatment of eating disorders | journal = The International Journal of Clinical and Experimental Hypnosis | volume = 55 | issue = 3 | pages = 318–35 | date = July 2007 | pmid = 17558721 | doi = 10.1080/00207140701338688 | s2cid = 9684032}}</ref> ''The first use of hypnotherapy in Bulimic patients was in 1981. When it comes to hypnotherapy, Bulimic patients are easier to hypnotize than Anorexia Nervosa patients. In Bulimic patients, hypnotherapy focuses on learning self-control when it comes to binging and vomiting, strengthening stimulus control techniques, enhancing ones ego, improving weight control, and helping overweight patients see their body differently (have a different image).''<ref>{{Cite journal |last1=Vanderlinden |first1=Johan |last2=Vandereycken |first2=Walter |date=September 1988 |title=The use of hypnotherapy in the treatment of eating disorders |url=http://dx.doi.org/10.1002/1098-108x(198809)7:5<673::aid-eat2260070511>3.0.co;2-r |journal=International Journal of Eating Disorders |volume=7 |issue=5 |pages=673–679 |doi=10.1002/1098-108x(198809)7:5<673::aid-eat2260070511>3.0.co;2-r |issn=0276-3478}}</ref> |
|||
=== Risk factors === |
|||
Being female and having bulimia nervosa takes a toll on mental health. Women frequently reported an onset of anxiety at the same time of the onset of bulimia nervosa.<ref>{{Cite journal |last1=Bulik |first1=Cynthia M |last2=Sullivan |first2=Patrick F |last3=Carter |first3=Frances A |last4=Joyce |first4=Peter R |date=September 1996 |title=Lifetime anxiety disorders in women with bulimia nervosa |url=http://dx.doi.org/10.1016/s0010-440x(96)90019-x |journal=Comprehensive Psychiatry |volume=37 |issue=5 |pages=368–374 |doi=10.1016/s0010-440x(96)90019-x |pmid=8879912 |issn=0010-440X}}</ref> The approximate female-to-male ratio of diagnosis is 10:1.<ref name="DSM5" /> In addition to cognitive, genetic, and environmental factors, childhood gastrointestinal problems and early pubertal maturation also increase the likelihood of developing bulimia nervosa.<ref>{{Cite journal |last1=Jacobi |first1=Corinna |last2=Hayward |first2=Chris |last3=de Zwaan |first3=Martina |last4=Kraemer |first4=Helena C. |last5=Agras |first5=W. Stewart |date=2004 |title=Coming to Terms With Risk Factors for Eating Disorders: Application of Risk Terminology and Suggestions for a General Taxonomy. |url=https://doi.apa.org/doi/10.1037/0033-2909.130.1.19 |journal=Psychological Bulletin |language=en |volume=130 |issue=1 |pages=19–65 |doi=10.1037/0033-2909.130.1.19 |pmid=14717649 |issn=1939-1455}}</ref> Another concern with eating disorders is developing a coexisting [[substance use disorder]].<ref>{{Cite journal |last1=Carbaugh |first1=Rebecca |last2=Sias |first2=Shari |date=2010-04-01 |title=Comorbidity of Bulimia Nervosa and Substance Abuse: Etiologies, Treatment Issues, and Treatment Approaches |url=http://dx.doi.org/10.17744/mehc.32.2.j72865m4159p1420 |journal=Journal of Mental Health Counseling |volume=32 |issue=2 |pages=125–138 |doi=10.17744/mehc.32.2.j72865m4159p1420 |issn=1040-2861}}</ref> |
|||
==Epidemiology== |
|||
[[File:Eating disorders world map-Deaths per million persons-WHO2012.svg|thumb|upright=1.3|Deaths due to eating disorders per million persons in 2012 {{Div col|small=yes|colwidth=10em}}{{legend|#ffff20|0-0}}{{legend|#ff9a20|1-1}}{{legend|#e06815|2-2}}{{legend|#d85010|3-3}}{{legend|#d02010|4–25}}{{div col end}}]] |
|||
There is little data on the percentage of people with bulimia in general populations.<ref name="DSM5" /> Most studies conducted thus far have been on convenience samples from hospital patients, high school or university students; research on bulimia nervosa among ethnic minorities has also been limited.<ref>{{Cite journal |last1=Ruchkin |first1=Vladislav |last2=Isaksson |first2=Johan |last3=Schwab-Stone |first3=Mary |last4=Stickley |first4=Andrew |date=2021-10-21 |title=Prevalence and early risk factors for bulimia nervosa symptoms in inner-city youth: gender and ethnicity perspectives |journal=Journal of Eating Disorders |language=en |volume=9 |issue=1 |pages=136 |doi=10.1186/s40337-021-00479-5 |doi-access=free |issn=2050-2974 |pmc=8529812 |pmid=34674763}}</ref> Existing studies have yielded a wide range of results: between 0.1% and 1.4% of males, and between 0.3% and 9.4% of females.<ref name="makino">{{cite journal | vauthors = Makino M, Tsuboi K, Dennerstein L | title = Prevalence of eating disorders: a comparison of Western and non-Western countries | journal = MedGenMed | volume = 6 | issue = 3 | pages = 49 | date = September 2004 | pmid = 15520673 | pmc = 1435625}}</ref> Studies on time trends in the prevalence of bulimia nervosa have also yielded inconsistent results.<ref>{{cite journal | vauthors = Hay PJ, Mond J, Buttner P, Darby A | title = Eating disorder behaviors are increasing: findings from two sequential community surveys in South Australia | journal = PLOS ONE | volume = 3 | issue = 2 | pages = e1541 | date = February 2008 | pmid = 18253489 | pmc = 2212110 | doi = 10.1371/journal.pone.0001541 | veditors = Murthy RS | bibcode = 2008PLoSO...3.1541H | doi-access = free}}</ref> According to Gelder, Mayou and Geddes (2005) bulimia nervosa is prevalent between 1 and 2 percent of women aged 15–40 years. Bulimia nervosa occurs more frequently in developed countries<ref name="Psychiatry">{{cite book |first1=Michael Graham |last1=Gelder |first2=Richard |last2=Mayou |first3=John |last3=Geddes | name-list-style = vanc |year=2005 |title=Psychiatry |publisher=Oxford University Press |isbn=978-0-19-852863-0 |url-access=registration |url=https://archive.org/details/psychiatry0000geld}}{{page needed|date=August 2013}}</ref> and in cities, with one study finding that bulimia is five times more prevalent in cities than in rural areas.<ref>{{cite journal | vauthors = van Son GE, van Hoeken D, Bartelds AI, van Furth EF, Hoek HW | title = Urbanisation and the incidence of eating disorders | journal = The British Journal of Psychiatry | volume = 189 | issue = 6 | pages = 562–3 | date = December 2006 | pmid = 17139044 | doi = 10.1192/bjp.bp.106.021378 | doi-access = free}}</ref> There is a perception that bulimia is most prevalent amongst girls from middle-class families;<ref>{{cite web|title=Bulimia |url=http://finddoctorsonline.com/health-topic.aspx/bulimia |archive-url=https://archive.today/20120709083530/http://finddoctorsonline.com/health-topic.aspx/bulimia |url-status=dead |archive-date=2012-07-09 |work=finddoctorsonline.com}}</ref> however, in a 2009 study girls from families in the lowest income bracket studied were 153 percent more likely to be bulimic than girls from the highest income bracket.<ref>{{cite news|vauthors = Grohol J|title=Black Girls At Risk for Bulimia|url=http://psychcentral.com/news/2009/03/19/black-girls-at-risk-for-bulimia/4835.html|date=March 19, 2009|url-status=live|archive-url=https://web.archive.org/web/20120524041711/http://psychcentral.com/news/2009/03/19/black-girls-at-risk-for-bulimia/4835.html|archive-date=May 24, 2012}}</ref> According to a study conducted in 2022 by Silen et al., which conglomerated statistics using various methods such as SCID, MRFS, EDE, SSAGA, and EDDI, the US, Finland, Australia, and the Netherlands had an estimated 2.1%, 2.4%, 1.0%, and 0.8% prevalence of bulimia nervosa among females under 30 years of age.<ref>{{cite journal |doi=10.1097/YCO.0000000000000818 |title=Worldwide prevalence of DSM-5 eating disorders among young people |date=2022 |last1=Silén |first1=Yasmina |last2=Keski-Rahkonen |first2=Anna |journal=Current Opinion in Psychiatry |volume=35 |issue=6 |pages=362–371 |pmid=36125216}}</ref> This demonstrates the prevalence of bulimia nervosa in developed, Western, first-world countries, indicating an urgency in treating adolescent women. Additionally, these statistics may be misrepresentative of the true population affected with bulimia nervosa due to potential underreporting bias. |
|||
There are higher rates of [[eating disorder]]s in groups involved in activities which idealize a slim physique, such as dance,<ref name="Tölgyes" /> gymnastics, modeling, [[cheerleading]], running, acting, swimming, diving, rowing and [[figure skating]]. Bulimia is thought to be more prevalent among [[white Americans|whites]];<ref>{{cite journal | vauthors = Franko DL, Becker AE, Thomas JJ, Herzog DB | title = Cross-ethnic differences in eating disorder symptoms and related distress | journal = The International Journal of Eating Disorders | volume = 40 | issue = 2 | pages = 156–64 | date = March 2007 | pmid = 17080449 | doi = 10.1002/eat.20341}}</ref> however, a more recent study showed that African-American teenage girls were 50 percent more likely than white girls to exhibit bulimic behavior, including both binging and purging.<ref>{{cite web|last=McBride|first=Hugh| name-list-style = vanc |title=Study Reveals Stunning Prevalence of Bulimia Among African-American Girls|url=http://www.teen-eating-disorders.net/teen_eating_disorders/study-reveals-stunning-prevalence-of-bulimia-among-african-american-girls.php|archive-url=https://web.archive.org/web/20120210165357/http://www.teen-eating-disorders.net/teen_eating_disorders/study-reveals-stunning-prevalence-of-bulimia-among-african-american-girls.php|archive-date=February 10, 2012}}</ref> |
|||
{| class="wikitable" style="margin-left: auto; margin-right: auto; border: none;" |
|||
! Country |
|||
! Year |
|||
! Sample size and type |
|||
! colspan="2" | % affected |
|||
|- |
|||
| [[Portugal]] || 2006 || 2,028 high school students || || 0.3% female<ref>{{cite journal | vauthors = Machado PP, Machado BC, Gonçalves S, Hoek HW | title = The prevalence of eating disorders not otherwise specified | journal = The International Journal of Eating Disorders | volume = 40 | issue = 3 | pages = 212–7 | date = April 2007 | pmid = 17173324 | doi = 10.1002/eat.20358 | hdl-access = free | hdl = 1822/5722}}</ref> |
|||
|- |
|||
| [[Brazil]] || 2004 || 1,807 students (ages 7–19) || 0.8% male || 1.3% female<ref>{{cite journal | vauthors = Vilela JE, Lamounier JA, Dellaretti Filho MA, Barros Neto JR, Horta GM | title = [Eating disorders in school children] | language = pt | journal = Jornal de Pediatria | volume = 80 | issue = 1 | pages = 49–54 | year = 2004 | pmid = 14978549 | doi = 10.1590/S0021-75572004000100010 | trans-title = Eating disorders in school children | doi-access = free}}</ref> |
|||
|- |
|||
| Spain || 2004 || 2,509 female adolescents (ages 13–22) || || 1.4% female<ref>{{cite journal | vauthors = Lahortiga-Ramos F, De Irala-Estévez J, Cano-Prous A, Gual-García P, Martínez-González MA, Cervera-Enguix S | title = Incidence of eating disorders in Navarra (Spain) | journal = European Psychiatry | volume = 20 | issue = 2 | pages = 179–85 | date = March 2005 | pmid = 15797704 | doi = 10.1016/j.eurpsy.2004.07.008 | s2cid = 20615315}}</ref> |
|||
|- |
|||
| Hungary || 2003 || 580 [[Budapest]] residents || 0.4% male || 3.6% female<ref name="Tölgyes">{{cite journal | vauthors = Tölgyes T, Nemessury J | title = Epidemiological studies on adverse dieting behaviours and eating disorders among young people in Hungary | journal = Social Psychiatry and Psychiatric Epidemiology | volume = 39 | issue = 8 | pages = 647–54 | date = August 2004 | pmid = 15300375 | doi = 10.1007/s00127-004-0783-z | s2cid = 23275345}}</ref> |
|||
|- |
|||
| Australia || 1998 || 4,200 high school students || align="center" colspan="2" | 0.3% combined<ref>{{cite journal | vauthors = Hay P | title = The epidemiology of eating disorder behaviors: an Australian community-based survey | journal = The International Journal of Eating Disorders | volume = 23 | issue = 4 | pages = 371–82 | date = May 1998 | pmid = 9561427 | doi = 10.1002/(SICI)1098-108X(199805)23:4<371::AID-EAT4>3.0.CO;2-F}}</ref> |
|||
|- |
|||
| United States || 1996 || 1,152 college students || 0.2% male || 1.3% female<ref>{{cite journal | vauthors = Pemberton AR, Vernon SW, Lee ES | title = Prevalence and correlates of bulimia nervosa and bulimic behaviors in a racially diverse sample of undergraduate students in two universities in southeast Texas | journal = American Journal of Epidemiology | volume = 144 | issue = 5 | pages = 450–5 | date = September 1996 | pmid = 8781459 | doi = 10.1093/oxfordjournals.aje.a008950 | doi-access = free}}</ref> |
|||
|- |
|||
| Norway || 1995 || 19,067 psychiatric patients || 0.7% male || 7.3% female<ref>{{cite journal | vauthors = Götestam KG, Eriksen L, Hagen H | title = An epidemiological study of eating disorders in Norwegian psychiatric institutions | journal = The International Journal of Eating Disorders | volume = 18 | issue = 3 | pages = 263–8 | date = November 1995 | pmid = 8556022 | doi = 10.1002/1098-108X(199511)18:3<263::AID-EAT2260180308>3.0.CO;2-O}}</ref> |
|||
|- |
|||
| Canada || 1995 || 8,116 (random sample) || 0.1% male || 1.1% female<ref>{{cite journal | vauthors = Garfinkel PE, Lin E, Goering P, Spegg C, Goldbloom DS, Kennedy S, Kaplan AS, Woodside DB | display-authors = 6 | title = Bulimia nervosa in a Canadian community sample: prevalence and comparison of subgroups | journal = The American Journal of Psychiatry | volume = 152 | issue = 7 | pages = 1052–8 | date = July 1995 | pmid = 7793442 | doi = 10.1176/ajp.152.7.1052}}</ref> |
|||
|- |
|||
| Japan || 1995 || 2,597 high school students || 0.7% male || 1.9% female<ref>{{cite journal | vauthors = Suzuki K, Takeda A, Matsushita S | title = Coprevalence of bulimia with alcohol abuse and smoking among Japanese male and female high school students | journal = Addiction | volume = 90 | issue = 7 | pages = 971–5 | date = July 1995 | pmid = 7663319 | doi = 10.1046/j.1360-0443.1995.90797110.x}}</ref> |
|||
|- |
|||
| United States || 1992 || 799 college students || 0.4% male || 5.1% female<ref>{{cite journal | vauthors = Heatherton TF, Nichols P, Mahamedi F, Keel P | title = Body weight, dieting, and eating disorder symptoms among college students, 1982 to 1992 | journal = The American Journal of Psychiatry | volume = 152 | issue = 11 | pages = 1623–9 | date = November 1995 | pmid = 7485625 | doi = 10.1176/ajp.152.11.1623}}</ref> |
|||
|} |
|||
==History== |
|||
===Etymology=== |
|||
The term ''bulimia'' comes from [[Ancient Greek|Greek]] {{lang|grc|βουλιμία}} ''boulīmia'', "ravenous hunger", a compound of βοῦς ''bous'', "ox" and λιμός, ''līmos'', "hunger".<ref>{{Cite web|title = Online Etymology Dictionary: bulimia|date = November 2001|access-date = 2008-04-06|author = Douglas Harper|work = [[Online Etymology Dictionary]]|url = http://www.etymonline.com/index.php?search=bulimia&searchmode=none|url-status = live|archive-url = https://web.archive.org/web/20080617205424/http://www.etymonline.com/index.php?search=bulimia&searchmode=none|archive-date = 2008-06-17}}</ref> Literally, the scientific name of the disorder, ''bulimia nervosa'', translates to "nervous ravenous hunger". |
|||
===Before the 20th century=== |
|||
Although diagnostic criteria for bulimia nervosa did not appear until 1979, evidence suggests that binging and purging were popular in certain ancient cultures. The first documented account of behavior resembling bulimia nervosa was recorded in [[Anabasis (Xenophon)|Xenophon's Anabasis]] around 370 B.C, in which Greek soldiers purged themselves in the mountains of [[Asia Minor]]. It is unclear whether this purging was preceded by binging.<ref name="Reference 1">Giannini, A. J. (1993). "A history of bulimia". In ''The Eating disorders'' (pp. 18–21). Springer New York.</ref> In ancient Egypt, physicians recommended purging once a month for three days to preserve health.<ref name= "Reference 2">Russell, G. (1997). ''The history of bulimia nervosa''. D. Garner & P. Garfinkel (Eds.), Handbook of Treatment for Eating Disorders (2nd ed., pp. 11–24). New York, NY: The Guilford Press.</ref> This practice stemmed from the belief that human diseases were caused by the food itself. In ancient Rome, elite society members would vomit to "make room" in their stomachs for more food at all-day banquets.<ref name="Reference 2" /> Emperors [[Claudius]] and [[Vitellius]] both were gluttonous and obese, and they often resorted to habitual purging.<ref name="Reference 2" /> |
|||
Historical records also suggest that some saints who developed [[Anorexia nervosa|anorexia]] (as a result of a life of asceticism) may also have displayed bulimic behaviors.<ref name="Reference 2"/> [[Magdalena de Pazzi|Saint Mary Magdalen de Pazzi]] (1566–1607) and [[Veronica Giuliani|Saint Veronica Giuliani]] (1660–1727) were both observed binge eating—giving in, as they believed, to the temptations of the devil.<ref name="Reference 2"/> [[Catherine of Siena|Saint Catherine of Siena]] (1347–1380) is known to have supplemented her strict abstinence from food by purging as reparation for her sins. Catherine died from starvation at age thirty-three.<ref name="Reference 2" /> |
|||
While the psychological disorder "bulimia nervosa" is relatively new, the word "bulimia", signifying overeating, has been present for centuries.<ref name="Reference 2"/> The Babylon [[Talmud]] referenced practices of "bulimia", yet scholars believe that this simply referred to overeating without the purging or the psychological implications bulimia nervosa.<ref name="Reference 2" /> In fact, a search for evidence of bulimia nervosa from the 17th to late 19th century revealed that only a quarter of the overeating cases they examined actually vomited after the binges. There was no evidence of deliberate vomiting or an attempt to control weight.<ref name="Reference 2" /> |
|||
===20th century=== |
|||
Globally, bulimia was estimated to affect 3.6 million people in 2015.<ref name="GBD2015Pre">{{cite journal |vauthors=Vos T, Allen C, Arora M, Barber RM, Bhutta ZA, Brown A, etal |date=October 2016 |title=Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015 |journal=Lancet |volume=388 |issue=10053 |pages=1545–1602 |doi=10.1016/S0140-6736(16)31678-6 |pmc=5055577 |pmid=27733282 |collaboration=GBD 2015 Disease and Injury Incidence and Prevalence Collaborators}}</ref> About 1% of young women have bulimia at a given point in time and about 2% to 3% of women have the condition at some point in their lives.<ref name="Sm2012">{{cite journal |vauthors=Smink FR, van Hoeken D, Hoek HW |date=August 2012 |title=Epidemiology of eating disorders: incidence, prevalence and mortality rates |journal=Current Psychiatry Reports |volume=14 |issue=4 |pages=406–14 |doi=10.1007/s11920-012-0282-y |pmc=3409365 |pmid=22644309}}</ref> The condition is less common in the developing world.<ref name="Hay2010" /> Bulimia is about nine times more likely to occur in women than men.<ref name="DSM5" /> Among women, rates are highest in young adults.<ref name="DSM5" /> Bulimia was named and first described by the British psychiatrist [[Gerald Russell]] in 1979.<ref name="Russell1979">{{cite journal |vauthors=Russell G |date=August 1979 |title=Bulimia nervosa: an ominous variant of anorexia nervosa |journal=Psychological Medicine |volume=9 |issue=3 |pages=429–48 |doi=10.1017/S0033291700031974 |pmid=482466 |s2cid=23973384}}</ref><ref>{{cite journal |vauthors=Palmer R |date=December 2004 |title=Bulimia nervosa: 25 years on |journal=The British Journal of Psychiatry |volume=185 |issue=6 |pages=447–8 |doi=10.1192/bjp.185.6.447 |pmid=15572732 |doi-access=free}}</ref> |
|||
At the turn of the century, bulimia (overeating) was described as a clinical symptom, but rarely in the context of weight control.<ref name="Reference 3">{{cite journal | last1 = Casper | first1 = Regina C. | name-list-style = vanc | title = On the emergence of bulimia nervosa as a syndrome a historical view | journal = International Journal of Eating Disorders | volume = 2 | issue = 3 | pages = 3–16 | year = 1983 | doi = 10.1002/1098-108X(198321)2:3<3::AID-EAT2260020302>3.0.CO;2-D }}</ref> Purging, however, was seen in anorexic patients and attributed to gastric pain rather than another method of weight control.<ref name="Reference 3" /> |
|||
In 1930, admissions of anorexia nervosa patients to the [[Mayo Clinic]] from 1917 to 1929 were compiled. Fifty-five to sixty-five percent of these patients were reported to be voluntarily vomiting to relieve weight anxiety.<ref name="Reference 3"/> Records show that purging for weight control continued throughout the mid-1900s. Several case studies from this era reveal patients with the modern description of bulimia nervosa.<ref name="Reference 3"/> In 1939, Rahman and Richardson reported that out of their six anorexic patients, one had periods of overeating, and another practiced self-induced vomiting.<ref name="Reference 3"/> Wulff, in 1932, treated "Patient D", who would have periods of intense cravings for food and overeat for weeks, which often resulted in frequent vomiting.<ref name="Reference 2"/> Patient D, who grew up with a tyrannical father, was repulsed by her weight and would fast for a few days, rapidly losing weight. [[Ellen West]], a patient described by [[Ludwig Binswanger]] in 1958, was teased by friends for being fat and excessively took thyroid pills to lose weight, later using laxatives and vomiting.<ref name="Reference 2"/> She reportedly consumed dozens of oranges and several pounds of tomatoes each day, yet would skip meals. After being admitted to a psychiatric facility for depression, Ellen ate ravenously yet lost weight, presumably due to self-induced vomiting.<ref name="Reference 2"/> However, while these patients may have met modern criteria for bulimia nervosa, they cannot technically be diagnosed with the disorder, as it had not yet appeared in the [[Diagnostic and Statistical Manual of Mental Disorders]] at the time of their treatment.<ref name="Reference 2" /> |
|||
An explanation for the increased instances of bulimic symptoms may be due to the 20th century's new ideals of thinness.<ref name="Reference 3"/> The shame of being fat emerged in the 1940s when teasing remarks about weight became more common. The 1950s, however, truly introduced the trend of aspiration for thinness.<ref name="Reference 3" /> |
|||
In 1979, [[Gerald Russell]] first published a description of bulimia nervosa, in which he studied patients with a "morbid fear of becoming fat" who overate and purged afterward.<ref name=Russell1979 /> He specified treatment options and indicated the seriousness of the disease, which can be accompanied by depression and suicide.<ref name=Russell1979 /> In 1980, bulimia nervosa first appeared in the [[DSM-III]].<ref name=Russell1979 /> |
|||
After its appearance in the DSM-III, there was a sudden rise in the documented incidents of bulimia nervosa.<ref name="Reference 2" /> In the early 1980s, incidents of the disorder rose to about 40 in every 100,000 people.<ref name="Reference 2" /> This decreased to about 27 in every 100,000 people at the end of the 1980s/early 1990s.<ref name="Reference 2" /> However, bulimia nervosa's prevalence was still much higher than anorexia nervosa's, which at the time occurred in about 14 people per 100,000.<ref name="Reference 2" /> |
|||
In 1991, Kendler et al. documented the cumulative risk for bulimia nervosa for those born before 1950, from 1950 to 1959, and after 1959.<ref name="Reference 5">{{cite journal | vauthors = Kendler KS, MacLean C, Neale M, Kessler R, Heath A, Eaves L | title = The genetic epidemiology of bulimia nervosa | journal = The American Journal of Psychiatry | volume = 148 | issue = 12 | pages = 1627–37 | date = December 1991 | pmid = 1842216 | doi = 10.1176/ajp.148.12.1627 }}</ref> The risk for those born after 1959 is much higher than those in either of the other cohorts.<ref name="Reference 5" /> |
|||
== See also == |
== See also == |
||
* [[Anorectic Behavior Observation Scale]] |
|||
* [[Anorexia nervosa]] |
|||
* [[ |
* [[Eating recovery]] |
||
* [[ |
* [[Evolutionary psychiatry]] |
||
* [[Binge eating disorder]] |
* [[Binge eating disorder]] |
||
* [[List of people with bulimia nervosa]] |
|||
* [[Cachexia]] |
|||
* [[Calorie restriction]] |
|||
* [[Defensive vomiting]] |
|||
* [[Eating disorder]] |
|||
* [[Eating disorder not otherwise specified]] |
|||
* [[Fasting girls]] for a historical perspective on anorexia nervosa |
|||
* [[Female body shape]] |
|||
* [[Malnutrition]] |
|||
* [[Muscle dysmorphia]] ('reverse' anorexia nervosa) |
|||
* [[Orthorexia nervosa]] |
|||
* [[Pro-ana]] |
|||
* [[Purging disorder]] |
|||
* [[Refeeding syndrome]] |
|||
== References == |
== References == |
||
{{Reflist}} |
|||
== External links == |
|||
{{Reflist|2}} |
|||
{{Commons category|Bulimia nervosa}} |
|||
{{Wikiquote}} |
|||
{{Medical resources |
|||
| DiseasesDB = 1770 |
|||
| ICD10 = {{ICD10|F|50|2|f|50}} |
|||
| ICD9 = {{ICD9|307.51}} |
|||
| MedlinePlus = 000341 |
|||
| OMIM = 607499 |
|||
| eMedicineSubj = emerg |
|||
| eMedicineTopic = 810 |
|||
| eMedicine_mult = {{eMedicine2|med|255}} |
|||
| MeshID = D052018 |
|||
}} |
|||
{{Mental and behavioural disorders|selected = physical}} |
|||
{{Authority control}} |
|||
[[Category:Eating disorders]] |
[[Category:Eating disorders]] |
||
[[Category: |
[[Category:Vomiting]] |
||
[[Category:Self-harm]] |
|||
[[Category:Wikipedia medicine articles ready to translate]] |
|||
{{Mental and behavioural disorders}} |
|||
[[Category:Wikipedia neurology articles ready to translate]] |
|||
[[ca:Bulímia]] |
|||
[[cs:Bulimie]] |
|||
[[da:Bulimi]] |
|||
[[de:Bulimie]] |
|||
[[eo:Bulimio]] |
|||
[[es:Bulimia]] |
|||
[[et:Buliimia]] |
|||
[[fi:Bulimia]] |
|||
[[fr:Boulimie]] |
|||
[[he:בולימיה]] |
|||
[[hr:Bulimija]] |
|||
[[is:Lotugræðgi]] |
|||
[[it:Bulimia]] |
|||
[[ja:神経性大食症]] |
|||
[[ka:ბულიმია]] |
|||
[[ko:폭식증]] |
|||
[[lmo:Bülimía]] |
|||
[[lt:Bulimija]] |
|||
[[no:Spiseforstyrrelse]] |
|||
[[nl:Boulimia]] |
|||
[[pl:Bulimia]] |
|||
[[pt:Bulimia nervosa]] |
|||
[[ru:Булимия]] |
|||
[[simple:Bulimia nervosa]] |
|||
[[sl:Bulimija]] |
|||
[[sr:Булимија]] |
|||
[[sv:Bulimia nervosa]] |
|||
[[zh:神經性暴食症]] |
Latest revision as of 16:40, 13 December 2024
This article needs to be updated.(September 2024) |
Bulimia nervosa | |
---|---|
Other names | Bulimia |
Loss of enamel (acid erosion) from the inside of the upper front teeth as a result of bulimia | |
Specialty | Psychiatry, clinical psychology |
Symptoms | Eating a large amount of food in a short amount of time followed by vomiting or the use of laxatives, often normal weight[1][2] |
Complications | Breakdown of the teeth, depression, anxiety, substance use disorders, suicide[2][3] |
Causes | Genetic and environmental factors[2][4] |
Diagnostic method | Based on person's medical history[5] |
Differential diagnosis | Anorexia, binge eating disorder, Kleine-Levin syndrome, borderline personality disorder[5] |
Treatment | Cognitive behavioral therapy[2][6] |
Medication | Selective serotonin reuptake inhibitors, tricyclic antidepressant[4][7] |
Prognosis | Half recover over 10 years with treatment[4] |
Frequency | 3.6 million (2015)[8] |
Bulimia nervosa, also known simply as bulimia, is an eating disorder characterized by binge eating (eating large quantities of food in a short period of time, often feeling out of control) followed by compensatory behaviors, such as vomiting, excessive exercise, or fasting to prevent weight gain.[9]
Other efforts to lose weight may include the use of diuretics, stimulants, water fasting, or excessive exercise.[2] Most people with bulimia are at normal weight and have higher risk for other mental disorders, such as depression, anxiety, borderline personality disorder, bipolar disorder, and problems with drugs to alcohol. There is also a higher risk of suicide and self-harm.
Bulimia is more common among those who have a close relative with the condition.[2] The percentage risk that is estimated to be due to genetics is between 30% and 80%.[4] Other risk factors for the disease include psychological stress, cultural pressure to attain a certain body type, poor self-esteem, and obesity.[2][4] Living in a culture that commercializes or glamorizes dieting, and having parental figures who fixate on weight are also risks.[4]
Diagnosis is based on a person's medical history;[5] however, this is difficult, as people are usually secretive about their binge eating and purging habits.[4] Further, the diagnosis of anorexia nervosa takes precedence over that of bulimia.[4] Other similar disorders include binge eating disorder, Kleine–Levin syndrome, and borderline personality disorder.[5]
Signs and symptoms
Bulimia typically involves rapid and out-of-control eating, which is followed by self-induced vomiting or other forms of purging.[11][9] This cycle may be repeated several times a week or, in more serious cases, several times a day[12] and may directly cause:
- Dehydration
- Electrolyte imbalance can lead to abnormal heart rhythms, cardiac arrest, and even death
- Oral trauma, lacerations to the lining of the mouth or throat due to forced throwing up movements.[13]
- Russell's sign: calluses on knuckles and back of hands due to repeated trauma from incisors[14][15]
- Swollen salivary glands (in the neck, under the jawline)[16][17]
- Gastrointestinal problems, like constipation and acid reflux[13]
- Constipation or diarrhea
- Hypotension
- Infertility and/or irregular menstrual cycles
- Weight Fluctuations
These are some of the many signs that may indicate whether someone has bulimia nervosa:[18]
- A fixation on the number of calories consumed
- A fixation on an extreme consciousness of one's weight
- Low self-esteem and/or self-harming
- Suicidal tendencies
- An irregular menstrual cycle in women
- Regular trips to the bathroom, especially soon after eating
- Depression, anxiety disorders, and sleep disorders
- Frequent occurrences involving the consumption of abnormally large portions of food[19]
- The use of laxatives, diuretics, and diet pills
- Compulsive or excessive exercise
- Unhealthy/dry skin, hair, nails, and lips
- Fatigue, or exhaustion
As with many psychiatric illnesses, delusions can occur, in conjunction with other signs and symptoms, leaving the person with a false belief that is not ordinarily accepted by others.[20]
People with bulimia nervosa may also exercise to a point that excludes other activities.[20]
Interoceptive
[edit]People with bulimia exhibit several interoceptive deficits, in which one experiences impairment in recognizing and discriminating between internal sensations, feelings, and emotions.[21] People with bulimia may also react negatively to somatic and affective states.[22] Regarding interoceptive sensation, hyposensitive individuals may not detect normal feelings of fullness at the appropriate time while eating, and are prone to eating more calories in a short period of time as a result of this decreased sensitivity.[21]
Examining from a neural basis also connects elements of interoception and emotion; notable overlaps occur in the medial prefrontal cortex, anterior and posterior cingulate, and anterior insula cortices, which are linked to both interoception and emotional eating.[23]
Related disorders
[edit]People with bulimia are at a higher risk to have an affective disorder, such as depression or general anxiety disorder. One study found 70% had depression at some time in their lives (as opposed to 26% for adult females in the general population), rising to 88% for all affective disorders combined.[24] Another study in the Journal of Affective Disorders found that of the population of patients that were diagnosed with an eating disorder according to the DSM-V guidelines about 27% also suffered from bipolar disorder. Within this article, the majority of the patients were diagnosed with bulimia nervosa, the second most common condition reported was binge-eating disorder.[25] Some individuals with anorexia nervosa exhibit episodes of bulimic tendencies through purging (either through self-induced vomiting or laxatives) as a way to quickly remove food in their system.[26] There may be an increased risk for diabetes mellitus type 2.[27] Bulimia also has negative effects on a person's teeth due to the acid passed through the mouth from frequent vomiting causing acid erosion, mainly on the posterior dental surface.
Research has shown that there is a relationship between bulimia and narcissism.[28][29][30] According to a study by the Australian National University, eating disorders are more susceptible among vulnerable narcissists. This can be caused by a childhood in which inner feelings and thoughts were minimized by parents, leading to "a high focus on receiving validation from others to maintain a positive sense of self".[31]
The medical journal Borderline Personality Disorder and Emotion Dysregulation notes that a "substantial rate of patients with bulimia nervosa" also have borderline personality disorder.[32]
A study by the Psychopharmacology Research Program of the University of Cincinnati College of Medicine "leaves little doubt that bipolar and eating disorders—particularly bulimia nervosa and bipolar II disorder—are related." The research shows that most clinical studies indicate that patients with bipolar disorder have higher rates of eating disorders, and vice versa. There is overlap in phenomenology, course, comorbidity, family history, and pharmacologic treatment response of these disorders. This is especially true of "eating dysregulation, mood dysregulation, impulsivity and compulsivity, craving for activity and/or exercise."[33]
Studies have shown a relationship between bulimia's effect on metabolic rate and caloric intake with thyroid dysfunction.[34]
Scientific research has shown that people suffering from bulimia have decreased volumes of brain matter, and that the abnormalities are reversible after long-term recovery.[35]
Causes
[edit]Biological
[edit]As with anorexia nervosa, there is evidence of genetic predispositions contributing to the onset of this eating disorder.[36] Abnormal levels of many hormones, notably serotonin, have been shown to be responsible for some disordered eating behaviors. Brain-derived neurotrophic factor (BDNF) is under investigation as a possible mechanism.[37][38]
There is evidence that sex hormones may influence appetite and eating in women and the onset of bulimia nervosa. Studies have shown that women with hyperandrogenism and polycystic ovary syndrome have a dysregulation of appetite, along with carbohydrates and fats. This dysregulation of appetite is also seen in women with bulimia nervosa. In addition, gene knockout studies in mice have shown that mice that have the gene encoding estrogen receptors have decreased fertility due to ovarian dysfunction and dysregulation of androgen receptors. In humans, there is evidence that there is an association between polymorphisms in the ERβ (estrogen receptor β) and bulimia, suggesting there is a correlation between sex hormones and bulimia nervosa.[39]
Bulimia has been compared to drug addiction, though the empirical support for this characterization is limited.[40] However, people with bulimia nervosa may share dopamine D2 receptor-related vulnerabilities with those with substance use disorders.[41]
Dieting, a common behaviour in bulimics, is associated with lower plasma tryptophan levels.[42] Decreased tryptophan levels in the brain, and thus the synthesis of serotonin, such as via acute tryptophan depletion, increases bulimic urges in currently and formerly bulimic individuals within hours.[43][44]
Abnormal blood levels of peptides important for the regulation of appetite and energy balance are observed in individuals with bulimia nervosa, but it remains unknown if this is a state or trait.[45]
In recent years, evolutionary psychiatry as an emerging scientific discipline has been studying mental disorders from an evolutionary perspective. If eating disorders, Bulimia nervosa in particular, have evolutionary functions or if they are new modern "lifestyle" problems is still debated.[46][47][48]
Social
[edit]Media portrayals of an 'ideal' body shape are widely considered to be a contributing factor to bulimia.[20] In a 1991 study by Weltzin, Hsu, Pollicle, and Kaye, it was stated that 19% of bulimics undereat, 37% of bulimics eat an average or normal amount of food, and 44% of bulimics overeat.[49] A survey of 15- to 18-year-old high school girls in Nadroga, Fiji, found the self-reported incidence of purging rose from 0% in 1995 (a few weeks after the introduction of television in the province) to 11.3% in 1998.[50] In addition, the suicide rate among people with bulimia nervosa is 7.5 times higher than in the general population.[51]
When attempting to decipher the origin of bulimia nervosa in a cognitive context, Christopher Fairburn et al.'s cognitive-behavioral model is often considered the golden standard.[52] Fairburn et al.'s model discusses the process in which an individual falls into the binge-purge cycle and thus develops bulimia. Fairburn et al. argue that extreme concern with weight and shape coupled with low self-esteem will result in strict, rigid, and inflexible dietary rules. Accordingly, this would lead to unrealistically restricted eating, which may consequently induce an eventual "slip" where the individual commits a minor infraction of the strict and inflexible dietary rules. Moreover, the cognitive distortion due to dichotomous thinking leads the individual to binge. The binge subsequently should trigger a perceived loss of control, promoting the individual to purge in hope of counteracting the binge. However, Fairburn et al. assert the cycle repeats itself, and thus consider the binge-purge cycle to be self-perpetuating.[53]
In contrast, Byrne and Mclean's findings differed slightly from Fairburn et al.'s cognitive-behavioral model of bulimia nervosa in that the drive for thinness was the major cause of purging as a way of controlling weight. In turn, Byrne and Mclean argued that this makes the individual vulnerable to binging, indicating that it is not a binge-purge cycle but rather a purge-binge cycle in that purging comes before bingeing. Similarly, Fairburn et al.'s cognitive-behavioral model of bulimia nervosa is not necessarily applicable to every individual and is certainly reductionist. Every one differs from another, and taking such a complex behavior like bulimia and applying the same one theory to everyone would certainly be invalid. In addition, the cognitive-behavioral model of bulimia nervosa is very culturally bound in that it may not be necessarily applicable to cultures outside of Western society. To evaluate, Fairburn et al..'s model and more generally the cognitive explanation of bulimia nervosa is more descriptive than explanatory, as it does not necessarily explain how bulimia arises. Furthermore, it is difficult to ascertain cause and effect, because it may be that distorted eating leads to distorted cognition rather than vice versa.[54][55]
A considerable amount of literature has identified a correlation between sexual abuse and the development of bulimia nervosa. The reported incident rate of unwanted sexual contact is higher among those with bulimia nervosa than anorexia nervosa.[56]
When exploring the etiology of bulimia through a socio-cultural perspective, the "thin ideal internalization" is significantly responsible. The thin-ideal internalization is the extent to which individuals adapt to the societal ideals of attractiveness. Studies have shown that young women that read fashion magazines tend to have more bulimic symptoms than those women who do not. This further demonstrates the impact of media on the likelihood of developing the disorder.[57] Individuals first accept and "buy into" the ideals, and then attempt to transform themselves in order to reflect the societal ideals of attractiveness. J. Kevin Thompson and Eric Stice claim that family, peers, and most evidently media reinforce the thin ideal, which may lead to an individual accepting and "buying into" the thin ideal. In turn, Thompson and Stice assert that if the thin ideal is accepted, one could begin to feel uncomfortable with their body shape or size since it may not necessarily reflect the thin ideal set out by society. Thus, people feeling uncomfortable with their bodies may result in body dissatisfaction and may develop a certain drive for thinness. Consequently, body dissatisfaction coupled with a drive for thinness is thought to promote dieting and negative effects, which could eventually lead to bulimic symptoms such as purging or bingeing. Binges lead to self-disgust which causes purging to prevent weight gain.[58]
A study dedicated to investigating the thin ideal internalization as a factor of bulimia nervosa is Thompson's and Stice's research. Their study aimed to investigate how and to what degree media affects the thin ideal internalization. Thompson and Stice used randomized experiments (more specifically programs) dedicated to teaching young women how to be more critical when it comes to media, to reduce thin-ideal internalization. The results showed that by creating more awareness of the media's control of the societal ideal of attractiveness, the thin ideal internalization significantly dropped. In other words, less thin ideal images portrayed by the media resulted in less thin-ideal internalization. Therefore, Thompson and Stice concluded that media greatly affected the thin ideal internalization.[59] Papies showed that it is not the thin ideal itself, but rather the self-association with other persons of a certain weight that decide how someone with bulimia nervosa feels. People that associate themselves with thin models get in a positive attitude when they see thin models and people that associate with overweight get in a negative attitude when they see thin models. Moreover, it can be taught to associate with thinner people.[60]
Diagnosis
[edit]The onset of bulimia nervosa is often during adolescence, between 13 and 20 years of age, and many cases have previously experienced obesity, with many relapsing in adulthood into episodic bingeing and purging even after initially successful treatment and remission.[61] A lifetime prevalence of 0.5 percent and 0.9 percent for adults and adolescents, respectively, is estimated among the United States population.[62] Bulimia nervosa may affect up to 1% of young women and, after 10 years of diagnosis, half will recover fully, a third will recover partially, and 10–20% will still have symptoms.[4]
Adolescents with bulimia nervosa are more likely to have self-imposed perfectionism and compulsivity issues in eating compared to their peers. This means that the high expectations and unrealistic goals that these individuals set for themselves are internally motivated rather than by social views or expectations.[63]
Criteria
[edit]Bulimia Nervosa is diagnosed using the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). The diagnostic criteria includes the following:[13][64]
- Recurrent episodes of binge eating
- Recurrent inappropriate compensatory behavior to prevent weight gain, like self-induced vomiting, misuse of laxatives or other medications, fasting, or excessive exercise.
- The binge eating and compensatory behaviors both occur at least once a week for three months
- Self-evaluation is influenced by body shape and weight.
Other methods are also used to narrow down the diagnosis, including:
- Physical exams: May include measuring your height and weight, checking vital signs, checking skin and nails, and listening to the heart and lungs.
- Lab tests: May include a complete blood count, tests to check electrolytes and protein, or a urinalysis might be performed.
- Psychological evaluations: A therapist or mental health provider will likely inquire about your thoughts, feelings, and eating habits, as well as asking you to complete a questionnaire.
Treatment
[edit]There are two main types of treatment given to those with bulimia nervosa; psychopharmacological and psychosocial treatments.[65]
Psychotherapy
[edit]Cognitive behavioral therapy (CBT) is considered the gold standard for the treatment of bulimia nervosa. This approach focuses on helping patients identify and change distorted thought patterns related to eating, body image, and self worth[66][67]
CBT helps patients identify and challenge the distorted thinking individuals might have about food, weight and body image. It also helps by offering the chance to identify the unhelpful thoughts about food and body image.[67]
By using CBT people record how much food they eat and periods of vomiting with the purpose of identifying and avoiding emotional fluctuations that bring on episodes of bulimia on a regular basis, as a component of this therapy is food journaling.[68] CBT is necessarily good for those with bulimia as it targets the binge-purge cycle, which is the hallmark of bulimia.[9][69][70] People undergoing CBT who exhibit early behavioral changes are most likely to achieve the best treatment outcomes in the long run.[71]
Researchers have also reported some positive outcomes for interpersonal psychotherapy and dialectical behavior therapy.[72][73] These therapies have good outcomes for treating bulimia, especially in patients with emotional regulation difficulties or interpersonal issues. While these therapies are not as extensively research as CBT, they can be beneficial when integrated into a comprehensive treatment plan.[66]
For adolescents, Family-Based therapy (FBT) has been identified as an effective treatment. FBT involes the family in the treatment process, where parents are empowered to take an active role in helping their child recover from bulimia nervosa. This approach is particularly helpful in younger patients who are still living with their families[66]
The use of CBT has been shown to be quite effective for treating bulimia nervosa (BN) in adults, but little research has been done on effective treatments of BN for adolescents.[74] Although CBT is seen as more cost-efficient and helps individuals with BN in self-guided care, Family Based Treatment (FBT) might be more helpful to younger adolescents who need more support and guidance from their families.[75] Adolescents are at the stage where their brains are still quite malleable and developing gradually.[76] Therefore, young adolescents with BN are less likely to realize the detrimental consequences of becoming bulimic and have less motivation to change,[77] which is why FBT would be useful to have families intervene and support the teens.[74] Working with BN patients and their families in FBT can empower the families by having them involved in their adolescent's food choices and behaviors, taking more control of the situation in the beginning and gradually letting the adolescent become more autonomous when they have learned healthier eating habits.[74]
Medication
[edit]Antidepressants, particularly selective serotonin reuptake inhibitors (SSRI), are often prescribed to treat bulimia nervosa, especially when comorbid depression or anxiety disorders are present. However, medications alone are generally not sufficient and are typically used in conjunction with psychotherapy[13][66] Compared to placebo, the use of a single antidepressant has been shown to be effective.[78] Combining medication with counseling can improve outcomes in some circumstances.[79] Some positive outcomes of treatments can include: abstinence from binge eating, a decrease in obsessive behaviors to lose weight and in shape preoccupation, less severe psychiatric symptoms, a desire to counter the effects of binge eating, as well as an improvement in social functioning and reduced relapse rates.[4]
A combination of psychotherapy, especially CBT and pharmacological treatments, such as SSRIs, often lead to better outcomes for individuals with bulimia. Combining both approaches is particularly beneficial in severe or chronic cases, where behavioral modification and mood stabilization are crucial.[66]
Alternative medicine
[edit]Some researchers have also claimed positive outcomes in hypnotherapy.[80] The first use of hypnotherapy in Bulimic patients was in 1981. When it comes to hypnotherapy, Bulimic patients are easier to hypnotize than Anorexia Nervosa patients. In Bulimic patients, hypnotherapy focuses on learning self-control when it comes to binging and vomiting, strengthening stimulus control techniques, enhancing ones ego, improving weight control, and helping overweight patients see their body differently (have a different image).[81]
Risk factors
[edit]Being female and having bulimia nervosa takes a toll on mental health. Women frequently reported an onset of anxiety at the same time of the onset of bulimia nervosa.[82] The approximate female-to-male ratio of diagnosis is 10:1.[5] In addition to cognitive, genetic, and environmental factors, childhood gastrointestinal problems and early pubertal maturation also increase the likelihood of developing bulimia nervosa.[83] Another concern with eating disorders is developing a coexisting substance use disorder.[84]
Epidemiology
[edit]There is little data on the percentage of people with bulimia in general populations.[5] Most studies conducted thus far have been on convenience samples from hospital patients, high school or university students; research on bulimia nervosa among ethnic minorities has also been limited.[85] Existing studies have yielded a wide range of results: between 0.1% and 1.4% of males, and between 0.3% and 9.4% of females.[86] Studies on time trends in the prevalence of bulimia nervosa have also yielded inconsistent results.[87] According to Gelder, Mayou and Geddes (2005) bulimia nervosa is prevalent between 1 and 2 percent of women aged 15–40 years. Bulimia nervosa occurs more frequently in developed countries[68] and in cities, with one study finding that bulimia is five times more prevalent in cities than in rural areas.[88] There is a perception that bulimia is most prevalent amongst girls from middle-class families;[89] however, in a 2009 study girls from families in the lowest income bracket studied were 153 percent more likely to be bulimic than girls from the highest income bracket.[90] According to a study conducted in 2022 by Silen et al., which conglomerated statistics using various methods such as SCID, MRFS, EDE, SSAGA, and EDDI, the US, Finland, Australia, and the Netherlands had an estimated 2.1%, 2.4%, 1.0%, and 0.8% prevalence of bulimia nervosa among females under 30 years of age.[91] This demonstrates the prevalence of bulimia nervosa in developed, Western, first-world countries, indicating an urgency in treating adolescent women. Additionally, these statistics may be misrepresentative of the true population affected with bulimia nervosa due to potential underreporting bias.
There are higher rates of eating disorders in groups involved in activities which idealize a slim physique, such as dance,[92] gymnastics, modeling, cheerleading, running, acting, swimming, diving, rowing and figure skating. Bulimia is thought to be more prevalent among whites;[93] however, a more recent study showed that African-American teenage girls were 50 percent more likely than white girls to exhibit bulimic behavior, including both binging and purging.[94]
Country | Year | Sample size and type | % affected | |
---|---|---|---|---|
Portugal | 2006 | 2,028 high school students | 0.3% female[95] | |
Brazil | 2004 | 1,807 students (ages 7–19) | 0.8% male | 1.3% female[96] |
Spain | 2004 | 2,509 female adolescents (ages 13–22) | 1.4% female[97] | |
Hungary | 2003 | 580 Budapest residents | 0.4% male | 3.6% female[92] |
Australia | 1998 | 4,200 high school students | 0.3% combined[98] | |
United States | 1996 | 1,152 college students | 0.2% male | 1.3% female[99] |
Norway | 1995 | 19,067 psychiatric patients | 0.7% male | 7.3% female[100] |
Canada | 1995 | 8,116 (random sample) | 0.1% male | 1.1% female[101] |
Japan | 1995 | 2,597 high school students | 0.7% male | 1.9% female[102] |
United States | 1992 | 799 college students | 0.4% male | 5.1% female[103] |
History
[edit]Etymology
[edit]The term bulimia comes from Greek βουλιμία boulīmia, "ravenous hunger", a compound of βοῦς bous, "ox" and λιμός, līmos, "hunger".[104] Literally, the scientific name of the disorder, bulimia nervosa, translates to "nervous ravenous hunger".
Before the 20th century
[edit]Although diagnostic criteria for bulimia nervosa did not appear until 1979, evidence suggests that binging and purging were popular in certain ancient cultures. The first documented account of behavior resembling bulimia nervosa was recorded in Xenophon's Anabasis around 370 B.C, in which Greek soldiers purged themselves in the mountains of Asia Minor. It is unclear whether this purging was preceded by binging.[105] In ancient Egypt, physicians recommended purging once a month for three days to preserve health.[106] This practice stemmed from the belief that human diseases were caused by the food itself. In ancient Rome, elite society members would vomit to "make room" in their stomachs for more food at all-day banquets.[106] Emperors Claudius and Vitellius both were gluttonous and obese, and they often resorted to habitual purging.[106]
Historical records also suggest that some saints who developed anorexia (as a result of a life of asceticism) may also have displayed bulimic behaviors.[106] Saint Mary Magdalen de Pazzi (1566–1607) and Saint Veronica Giuliani (1660–1727) were both observed binge eating—giving in, as they believed, to the temptations of the devil.[106] Saint Catherine of Siena (1347–1380) is known to have supplemented her strict abstinence from food by purging as reparation for her sins. Catherine died from starvation at age thirty-three.[106]
While the psychological disorder "bulimia nervosa" is relatively new, the word "bulimia", signifying overeating, has been present for centuries.[106] The Babylon Talmud referenced practices of "bulimia", yet scholars believe that this simply referred to overeating without the purging or the psychological implications bulimia nervosa.[106] In fact, a search for evidence of bulimia nervosa from the 17th to late 19th century revealed that only a quarter of the overeating cases they examined actually vomited after the binges. There was no evidence of deliberate vomiting or an attempt to control weight.[106]
20th century
[edit]Globally, bulimia was estimated to affect 3.6 million people in 2015.[8] About 1% of young women have bulimia at a given point in time and about 2% to 3% of women have the condition at some point in their lives.[3] The condition is less common in the developing world.[4] Bulimia is about nine times more likely to occur in women than men.[5] Among women, rates are highest in young adults.[5] Bulimia was named and first described by the British psychiatrist Gerald Russell in 1979.[107][108]
At the turn of the century, bulimia (overeating) was described as a clinical symptom, but rarely in the context of weight control.[109] Purging, however, was seen in anorexic patients and attributed to gastric pain rather than another method of weight control.[109]
In 1930, admissions of anorexia nervosa patients to the Mayo Clinic from 1917 to 1929 were compiled. Fifty-five to sixty-five percent of these patients were reported to be voluntarily vomiting to relieve weight anxiety.[109] Records show that purging for weight control continued throughout the mid-1900s. Several case studies from this era reveal patients with the modern description of bulimia nervosa.[109] In 1939, Rahman and Richardson reported that out of their six anorexic patients, one had periods of overeating, and another practiced self-induced vomiting.[109] Wulff, in 1932, treated "Patient D", who would have periods of intense cravings for food and overeat for weeks, which often resulted in frequent vomiting.[106] Patient D, who grew up with a tyrannical father, was repulsed by her weight and would fast for a few days, rapidly losing weight. Ellen West, a patient described by Ludwig Binswanger in 1958, was teased by friends for being fat and excessively took thyroid pills to lose weight, later using laxatives and vomiting.[106] She reportedly consumed dozens of oranges and several pounds of tomatoes each day, yet would skip meals. After being admitted to a psychiatric facility for depression, Ellen ate ravenously yet lost weight, presumably due to self-induced vomiting.[106] However, while these patients may have met modern criteria for bulimia nervosa, they cannot technically be diagnosed with the disorder, as it had not yet appeared in the Diagnostic and Statistical Manual of Mental Disorders at the time of their treatment.[106]
An explanation for the increased instances of bulimic symptoms may be due to the 20th century's new ideals of thinness.[109] The shame of being fat emerged in the 1940s when teasing remarks about weight became more common. The 1950s, however, truly introduced the trend of aspiration for thinness.[109]
In 1979, Gerald Russell first published a description of bulimia nervosa, in which he studied patients with a "morbid fear of becoming fat" who overate and purged afterward.[107] He specified treatment options and indicated the seriousness of the disease, which can be accompanied by depression and suicide.[107] In 1980, bulimia nervosa first appeared in the DSM-III.[107]
After its appearance in the DSM-III, there was a sudden rise in the documented incidents of bulimia nervosa.[106] In the early 1980s, incidents of the disorder rose to about 40 in every 100,000 people.[106] This decreased to about 27 in every 100,000 people at the end of the 1980s/early 1990s.[106] However, bulimia nervosa's prevalence was still much higher than anorexia nervosa's, which at the time occurred in about 14 people per 100,000.[106]
In 1991, Kendler et al. documented the cumulative risk for bulimia nervosa for those born before 1950, from 1950 to 1959, and after 1959.[110] The risk for those born after 1959 is much higher than those in either of the other cohorts.[110]
See also
[edit]- Anorectic Behavior Observation Scale
- Eating recovery
- Evolutionary psychiatry
- Binge eating disorder
- List of people with bulimia nervosa
References
[edit]- ^ Bulik CM, Marcus MD, Zerwas S, Levine MD, La Via M (October 2012). "The changing "weightscape" of bulimia nervosa". The American Journal of Psychiatry. 169 (10): 1031–6. doi:10.1176/appi.ajp.2012.12010147. PMC 4038540. PMID 23032383.
- ^ a b c d e f g "Bulimia nervosa fact sheet". Office on Women's Health. July 16, 2012. Archived from the original on June 19, 2015. Retrieved June 27, 2015.
- ^ a b Smink FR, van Hoeken D, Hoek HW (August 2012). "Epidemiology of eating disorders: incidence, prevalence and mortality rates". Current Psychiatry Reports. 14 (4): 406–14. doi:10.1007/s11920-012-0282-y. PMC 3409365. PMID 22644309.
- ^ a b c d e f g h i j k Hay PJ, Claudino AM (July 2010). "Bulimia nervosa". BMJ Clinical Evidence. 2010: 1009. PMC 3275326. PMID 21418667.
- ^ a b c d e f g h American Psychiatric Association (2013). Diagnostic and Statistical Manual of Mental Disorders (Fifth ed.). Arlington, VA: American Psychiatric Publishing. pp. 345–349. ISBN 978-0-89042-555-8.
- ^ Hay P (July 2013). "A systematic review of evidence for psychological treatments in eating disorders: 2005-2012". The International Journal of Eating Disorders. 46 (5): 462–9. doi:10.1002/eat.22103. PMID 23658093.
- ^ McElroy SL, Guerdjikova AI, Mori N, O'Melia AM (October 2012). "Current pharmacotherapy options for bulimia nervosa and binge eating disorder". Expert Opinion on Pharmacotherapy. 13 (14): 2015–26. doi:10.1517/14656566.2012.721781. PMID 22946772. S2CID 1747393.
- ^ a b Vos T, Allen C, Arora M, Barber RM, Bhutta ZA, Brown A, et al. (GBD 2015 Disease and Injury Incidence and Prevalence Collaborators) (October 2016). "Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1545–1602. doi:10.1016/S0140-6736(16)31678-6. PMC 5055577. PMID 27733282.
- ^ a b c "Bulimia nervosa - Symptoms and causes". Mayo Clinic. Retrieved 2024-12-05.
- ^ Dorfman J, The Center for Special Dentistry Archived February 11, 2015, at the Wayback Machine.
- ^ Steinhausen, Hans-Christoph; Weber, Sandy (December 2009). "The Outcome of Bulimia Nervosa: Findings From One-Quarter Century of Research". American Journal of Psychiatry. 166 (12): 1331–1341. doi:10.1176/appi.ajp.2009.09040582. ISSN 0002-953X. PMID 19884225.
- ^ "Bulimia Nervosa" (PDF). Let's Talk Facts: 1. 2005. Archived from the original (PDF) on March 19, 2015. Retrieved September 13, 2013.
- ^ a b c d Clinic, Cleavland (May 15, 2022). "Bulimia Nervosa".
- ^ Joseph AB, Herr B (May 1985). "Finger calluses in bulimia". The American Journal of Psychiatry. 142 (5): 655a–655. doi:10.1176/ajp.142.5.655a. PMID 3857013.
- ^ Wynn DR, Martin MJ (October 1984). "A physical sign of bulimia". Mayo Clinic Proceedings. 59 (10): 722. doi:10.1016/s0025-6196(12)62063-1. PMID 6592415.
- ^ "Eating Disorders". Oral Health Topics A–Z. American Dental Association. Archived from the original on February 3, 2009.
- ^ Mcgilley BM, Pryor TL (June 1998). "Assessment and treatment of bulimia nervosa". American Family Physician. 57 (11): 2743–50. PMID 9636337.
- ^ "Symptoms Of Bulimia Nervosa". Illawarra Mercury. February 23, 2001. Archived from the original on February 21, 2016.
- ^ "Bulimia Nervosa". Proud2BME. The National Eating Disorders Association. Archived from the original on December 10, 2014. Retrieved December 5, 2014.
- ^ a b c Barker P (2003). Psychiatric and Mental Health Nursing: The Craft of Caring. Great Britain: Arnold. ISBN 978-0340810262.[page needed]
- ^ a b Boswell JF, Anderson LM, Anderson DA (June 2015). "Integration of Interoceptive Exposure in Eating Disorder Treatment". Clinical Psychology: Science and Practice. 22 (2): 194–210. doi:10.1111/cpsp.12103.
- ^ Badoud D, Tsakiris M (June 2017). "From the body's viscera to the body's image: Is there a link between interoception and body image concerns?". Neuroscience and Biobehavioral Reviews. 77: 237–246. doi:10.1016/j.neubiorev.2017.03.017. PMID 28377099. S2CID 768206.
- ^ Barrett LF, Simmons WK (July 2015). "Interoceptive predictions in the brain". Nature Reviews. Neuroscience. 16 (7): 419–29. doi:10.1038/nrn3950. PMC 4731102. PMID 26016744.
- ^ Walsh BT, Roose SP, Glassman AH, Gladis M, Sadik C (1985). "Bulimia and depression". Psychosomatic Medicine. 47 (2): 123–31. doi:10.1097/00006842-198503000-00003. PMID 3863157. S2CID 12748691.
- ^ McElroy, Susan L.; Crow, Scott; Blom, Thomas J.; Biernacka, Joanna M.; Winham, Stacey J.; Geske, Jennifer; Cuellar-Barboza, Alfredo B.; Bobo, William V.; Prieto, Miguel L.; Veldic, Marin; Mori, Nicole; Seymour, Lisa R.; Bond, David J.; Frye, Mark A. (February 2016). "Prevalence and correlates of DSM-5 eating disorders in patients with bipolar disorder". Journal of Affective Disorders. 191: 216–221. doi:10.1016/j.jad.2015.11.010. PMID 26682490.
- ^ Carlson, N.R., et al. (2007). Psychology: The Science of Behaviour – 4th Canadian ed. Toronto, ON: Pearson Education Canada.[page needed]
- ^ Nieto-Martínez R, González-Rivas JP, Medina-Inojosa JR, Florez H (November 2017). "Are Eating Disorders Risk Factors for Type 2 Diabetes? A Systematic Review and Meta-analysis". Current Diabetes Reports. 17 (12): 138. doi:10.1007/s11892-017-0949-1. PMID 29168047. S2CID 3688434.
- ^ Maples J, Collins B, Miller JD, Fischer S, Seibert A (January 2011). "Differences between grandiose and vulnerable narcissism and bulimic symptoms in young women". Eat Behav. 12 (1): 83–5. doi:10.1016/j.eatbeh.2010.10.001. PMID 21184981.
- ^ Steiger H, Jabalpurwala S, Champagne J, Stotland S (September 1997). "A controlled study of trait narcissism in anorexia and bulimia nervosa". Int J Eat Disord. 22 (2): 173–8. doi:10.1002/(sici)1098-108x(199709)22:2<173::aid-eat9>3.0.co;2-c. PMID 9261656.
- ^ Steinberg BE, Shaw RJ (1997). "Bulimia as a disturbance of narcissism: self-esteem and the capacity to self-soothe". Addict Behav. 22 (5): 699–710. doi:10.1016/s0306-4603(97)00009-9. PMID 9347071. S2CID 25050604.
- ^ Sivanathan D, Bizumic B, Rieger E, Huxley E (December 2019). "Vulnerable narcissism as a mediator of the relationship between perceived parental invalidation and eating disorder pathology". Eat Weight Disord. 24 (6): 1071–1077. doi:10.1007/s40519-019-00647-2. PMID 30725304. S2CID 73416090.
- Lay summary in: "Vulnerable narcissists more susceptible to eating disorders". ANU College of Health & Medicine.
- ^ Hessler, Johannes Baltasar; Heuser, Jörg; Schlegl, Sandra; Bauman, Tabea; Greetfeld, Martin; Voderholzer, Ulrich (2019). "Impact of comorbid borderline personality disorder on inpatient treatment for bulimia nervosa: Analysis of routine data". Borderline Personality Disorder and Emotion Dysregulation. 6: 1. doi:10.1186/s40479-018-0098-4. PMC 6335811. PMID 30680217.
- ^ McElroy SL, Kotwal R, Keck PE, Akiskal HS (June 2005). "Comorbidity of bipolar and eating disorders: distinct or related disorders with shared dysregulations?". J Affect Disord. 86 (2–3): 107–27. doi:10.1016/j.jad.2004.11.008. PMID 15935230.
- ^ Altemus M, Hetherington M, Kennedy B, Licinio J, Gold PW (April 1996). "Thyroid function in bulimia nervosa". Psychoneuroendocrinology. 21 (3): 249–61. doi:10.1016/0306-4530(96)00002-9. PMID 8817724. S2CID 24919021.
- ^ Wagner, Angela; Greer, Phil; Bailer, Ursula F.; Frank, Guido K.; Henry, Shannan E.; Putnam, Karen; Meltzer, Carolyn C.; Ziolko, Scott K.; Hoge, Jessica; McConaha, Claire; Kaye, Walter H. (2006-02-01). "Normal Brain Tissue Volumes after Long-Term Recovery in Anorexia and Bulimia Nervosa". Biological Psychiatry. 59 (3): 291–293. doi:10.1016/j.biopsych.2005.06.014. PMID 16139807.
- ^ "Biological Causes of Anorexia Nervosa and Bulimia Nervosa". Archived from the original on May 2, 2016. Retrieved July 4, 2016.
- ^ Ribasés M, Gratacòs M, Fernández-Aranda F, Bellodi L, Boni C, Anderluh M, et al. (June 2004). "Association of BDNF with anorexia, bulimia and age of onset of weight loss in six European populations". Human Molecular Genetics. 13 (12): 1205–12. doi:10.1093/hmg/ddh137. PMID 15115760.
- ^ Wonderlich S, Mitchell JE, de Zwaan M, Steiger H, eds. (2018). "Psychobiology of eating disorders". Annual Review of Eating Disorders – part 2. Radcliffe Publishing. pp. 14–15. ISBN 978-1-84619-244-9.
- ^ Hirschberg AL (March 2012). "Sex hormones, appetite and eating behaviour in women". Maturitas. 71 (3): 248–56. doi:10.1016/j.maturitas.2011.12.016. PMID 22281161.
- ^ Broft A, Shingleton R, Kaufman J, Liu F, Kumar D, Slifstein M, et al. (July 2012). "Striatal dopamine in bulimia nervosa: a PET imaging study". The International Journal of Eating Disorders. 45 (5): 648–56. doi:10.1002/eat.20984. PMC 3640453. PMID 22331810.
- ^ Kaye WH, Wierenga CE, Bailer UF, Simmons AN, Wagner A, Bischoff-Grethe A (May 2013). "Does a shared neurobiology for foods and drugs of abuse contribute to extremes of food ingestion in anorexia and bulimia nervosa?". Biological Psychiatry. 73 (9): 836–42. doi:10.1016/j.biopsych.2013.01.002. PMC 3755487. PMID 23380716.
- ^ Strasser B, Fuchs D (2016). "Diet Versus Exercise in Weight Loss and Maintenance: Focus on Tryptophan". International Journal of Tryptophan Research. 9: 9–16. doi:10.4137/IJTR.S33385. PMC 4864009. PMID 27199566.
- ^ Smith KA, Fairburn CG, Cowen PJ (February 1999). "Symptomatic relapse in bulimia nervosa following acute tryptophan depletion". Archives of General Psychiatry. 56 (2): 171–6. doi:10.1001/archpsyc.56.2.171. PMID 10025442.
- ^ Weltzin TE, Fernstrom MH, Fernstrom JD, Neuberger SK, Kaye WH (November 1995). "Acute tryptophan depletion and increased food intake and irritability in bulimia nervosa". The American Journal of Psychiatry. 152 (11): 1668–71. doi:10.1176/ajp.152.11.1668. PMID 7485633.
- ^ Tortorella A, Brambilla F, Fabrazzo M, Volpe U, Monteleone AM, Mastromo D, Monteleone P (September 2014). "Central and peripheral peptides regulating eating behaviour and energy homeostasis in anorexia nervosa and bulimia nervosa: a literature review". European Eating Disorders Review. 22 (5): 307–20. doi:10.1002/erv.2303. PMID 24942507.
- ^ Abed RT (December 1998). "The sexual competition hypothesis for eating disorders". Br J Med Psychol. 71 ( Pt 4) (4): 525–47. doi:10.1111/j.2044-8341.1998.tb01007.x. PMID 9875960.
- ^ Nettersheim J, Gerlach G, Herpertz S, Abed R, Figueredo AJ, Brüne M (2018). "Evolutionary Psychology of Eating Disorders: An Explorative Study in Patients With Anorexia Nervosa and Bulimia Nervosa". Front Psychol. 9: 2122. doi:10.3389/fpsyg.2018.02122. PMC 6220092. PMID 30429818.
- ^ Nesse RM (2020). Good reasons for bad feelings: insights from the frontier of evolutionary psychiatry. Penguin Books, Limited. ISBN 978-0-14-198491-9. OCLC 1100591660.[page needed]
- ^ Carlson NR, Buskist W, Heth CD, Schmaltz R (2010). Psychology: the science of behaviour (4th Canadian ed.). Toronto: Pearson Education Canada. p. 415. ISBN 978-0-205-70286-2.
- ^ Becker AE, Burwell RA, Gilman SE, Herzog DB, Hamburg P (June 2002). "Eating behaviours and attitudes following prolonged exposure to television among ethnic Fijian adolescent girls". The British Journal of Psychiatry. 180 (6): 509–14. doi:10.1192/bjp.180.6.509. PMID 12042229.
- ^ Nolen-Hoeksema, Susan (2014). "Bulimia Nervosa" Abnormal Psychology. 6e. pg 344.
- ^ Cooper Z, Fairburn CG (2013). "The Evolution of "Enhanced" Cognitive Behavior Therapy for Eating Disorders: Learning From Treatment Nonresponse". Cognitive and Behavioral Practice. 18 (3): 394–402. doi:10.1016/j.cbpra.2010.07.007. PMC 3695554. PMID 23814455.
- ^ Fairburn CG, Beglin SJ (April 1990). "Studies of the epidemiology of bulimia nervosa". The American Journal of Psychiatry. 147 (4): 401–8. doi:10.1176/ajp.147.4.401. PMID 2180327.
- ^ Trull T (2010-10-08). Abnormal Psychology and Life: A Dimensional Approach. Belmont CA: Wadsworth, Cengage Learning. pp. 236–8. ISBN 978-1-111-34376-7. Archived from the original on 2016-02-07.
- ^ Byrne SM, McLean NJ (January 2002). "The cognitive-behavioral model of bulimia nervosa: a direct evaluation". The International Journal of Eating Disorders. 31 (1): 17–31. doi:10.1002/eat.10002. PMID 11835294.
- ^ Waller G (July 1992). "Sexual abuse and the severity of bulimic symptoms". The British Journal of Psychiatry. 161: 90–3. doi:10.1192/bjp.161.1.90. PMID 1638336. S2CID 39739310.
- ^ Nolen-Hoeksema S (2013). (Ab)normal Psychology. McGraw Hill. p. 338. ISBN 978-0078035388.
- ^ Zieve D. "Bulimia". PubMed Health. Archived from the original on February 11, 2011. Retrieved April 18, 2011.
- ^ Thompson JK, Stice E (2001). "Thin-Ideal Internalization: Mounting Evidence for a New Risk Factor for Body-Image Disturbance and Eating Pathology". Current Directions in Psychological Science. 10 (5): 181–3. doi:10.1111/1467-8721.00144. JSTOR 20182734. S2CID 20401750.
- ^ Papies EK, Nicolaije KA (January 2012). "Inspiration or deflation? Feeling similar or dissimilar to slim and plus-size models affects self-evaluation of restrained eaters". Body Image. 9 (1): 76–85. doi:10.1016/j.bodyim.2011.08.004. PMID 21962524.
- ^ Shader RI (2004). Manual of Psychiatric Therapeutics. Hagerstwon, MD: Lippincott Williams & Wilkins. ISBN 978-0-7817-4459-1.[page needed]
- ^ [Nolen-Hoeksema, S. (2013)."(Ab)normal Psychology"(6th edition). McGraw-Hill. p.344]
- ^ Castro-Fornieles J, Gual P, Lahortiga F, Gila A, Casulà V, Fuhrmann C, et al. (September 2007). "Self-oriented perfectionism in eating disorders". The International Journal of Eating Disorders. 40 (6): 562–8. doi:10.1002/eat.20393. PMID 17510925.
- ^ Harrington, Brian C.; Jimerson, Michelle; Haxton, Christina; Jimerson, David C. (2015-01-01). "Initial Evaluation, Diagnosis, and Treatment of Anorexia Nervosa and Bulimia Nervosa". American Family Physician. 91 (1): 46–52. PMID 25591200.
- ^ Hoste RR, Labuschagne Z, Le Grange D (August 2012). "Adolescent bulimia nervosa". Current Psychiatry Reports. 14 (4): 391–7. doi:10.1007/s11920-012-0280-0. PMID 22614677. S2CID 36665983.
- ^ a b c d e Hay, Phillipia (Jul 19, 2010). "Bulimia Nervosa". BMJ Clinical Evidence: 1009. PMC 3275326. PMID 21418667.
- ^ a b Hagan, Kelsey E.; Walsh, B. Timothy (2021-01-01). "State of the Art: The Therapeutic Approaches to Bulimia Nervosa". Clinical Therapeutics. 43 (1): 40–49. doi:10.1016/j.clinthera.2020.10.012. ISSN 0149-2918. PMC 7902447. PMID 33358256.
- ^ a b Gelder MG, Mayou R, Geddes J (2005). Psychiatry. Oxford University Press. ISBN 978-0-19-852863-0.[page needed]
- ^ Agras WS, Crow SJ, Halmi KA, Mitchell JE, Wilson GT, Kraemer HC (August 2000). "Outcome predictors for the cognitive behavior treatment of bulimia nervosa: data from a multisite study". The American Journal of Psychiatry. 157 (8): 1302–8. doi:10.1176/appi.ajp.157.8.1302. PMID 10910795.
- ^ Wilson GT, Loeb KL, Walsh BT, Labouvie E, Petkova E, Liu X, Waternaux C (August 1999). "Psychological versus pharmacological treatments of bulimia nervosa: predictors and processes of change". Journal of Consulting and Clinical Psychology. 67 (4): 451–9. CiteSeerX 10.1.1.583.7568. doi:10.1037/0022-006X.67.4.451. PMID 10450615.
- ^ Trunko ME, Rockwell RE, Curry E, Runfola C, Kaye WH (March 2007). "Management of bulimia nervosa". Women's Health. 3 (2): 255–65. doi:10.2217/17455057.3.2.255. PMID 19803857.
- ^ Fairburn CG, Agras WS, Walsh BT, Wilson GT, Stice E (December 2004). "Prediction of outcome in bulimia nervosa by early change in treatment". The American Journal of Psychiatry. 161 (12): 2322–4. doi:10.1176/appi.ajp.161.12.2322. PMID 15569910.
- ^ Safer DL, Telch CF, Agras WS (April 2001). "Dialectical behavior therapy for bulimia nervosa". The American Journal of Psychiatry. 158 (4): 632–4. doi:10.1176/appi.ajp.158.4.632. PMID 11282700.
- ^ a b c Keel PK, Haedt A (January 2008). "Evidence-based psychosocial treatments for eating problems and eating disorders". Journal of Clinical Child and Adolescent Psychology. 37 (1): 39–61. CiteSeerX 10.1.1.822.6191. doi:10.1080/15374410701817832. PMID 18444053. S2CID 16098576.
- ^ Nadeau PO, Leichner P (February 2009). "Treating Bulimia in Adolescents: A Family-Based Approach". Journal of the Canadian Academy of Child and Adolescent Psychiatry. 18 (1): 67–68. PMC 2651218.
- ^ Le Grange D, Lock J, Dymek M (2003). "Family-based therapy for adolescents with bulimia nervosa". American Journal of Psychotherapy. 57 (2): 237–51. doi:10.1176/appi.psychotherapy.2003.57.2.237. PMID 12817553.
- ^ Castro-Fornieles J, Bigorra A, Martinez-Mallen E, Gonzalez L, Moreno E, Font E, Toro J (2011). "Motivation to change in adolescents with bulimia nervosa mediates clinical change after treatment". European Eating Disorders Review. 19 (1): 46–54. doi:10.1002/erv.1045. PMID 20872926.
- ^ Bacaltchuk J, Hay P (2003). "Antidepressants versus placebo for people with bulimia nervosa". Cochrane Database Syst Rev (4): CD003391. doi:10.1002/14651858.CD003391. PMC 6991155. PMID 14583971.
- ^ Bacaltchuk J, Hay P, Trefiglio R (2001). "Antidepressants versus psychological treatments and their combination for bulimia nervosa". The Cochrane Database of Systematic Reviews. 2001 (4): CD003385. doi:10.1002/14651858.CD003385. PMC 6999807. PMID 11687197.
- ^ Barabasz M (July 2007). "Efficacy of hypnotherapy in the treatment of eating disorders". The International Journal of Clinical and Experimental Hypnosis. 55 (3): 318–35. doi:10.1080/00207140701338688. PMID 17558721. S2CID 9684032.
- ^ Vanderlinden, Johan; Vandereycken, Walter (September 1988). <673::aid-eat2260070511>3.0.co;2-r "The use of hypnotherapy in the treatment of eating disorders". International Journal of Eating Disorders. 7 (5): 673–679. doi:10.1002/1098-108x(198809)7:5<673::aid-eat2260070511>3.0.co;2-r. ISSN 0276-3478.
- ^ Bulik, Cynthia M; Sullivan, Patrick F; Carter, Frances A; Joyce, Peter R (September 1996). "Lifetime anxiety disorders in women with bulimia nervosa". Comprehensive Psychiatry. 37 (5): 368–374. doi:10.1016/s0010-440x(96)90019-x. ISSN 0010-440X. PMID 8879912.
- ^ Jacobi, Corinna; Hayward, Chris; de Zwaan, Martina; Kraemer, Helena C.; Agras, W. Stewart (2004). "Coming to Terms With Risk Factors for Eating Disorders: Application of Risk Terminology and Suggestions for a General Taxonomy". Psychological Bulletin. 130 (1): 19–65. doi:10.1037/0033-2909.130.1.19. ISSN 1939-1455. PMID 14717649.
- ^ Carbaugh, Rebecca; Sias, Shari (2010-04-01). "Comorbidity of Bulimia Nervosa and Substance Abuse: Etiologies, Treatment Issues, and Treatment Approaches". Journal of Mental Health Counseling. 32 (2): 125–138. doi:10.17744/mehc.32.2.j72865m4159p1420. ISSN 1040-2861.
- ^ Ruchkin, Vladislav; Isaksson, Johan; Schwab-Stone, Mary; Stickley, Andrew (2021-10-21). "Prevalence and early risk factors for bulimia nervosa symptoms in inner-city youth: gender and ethnicity perspectives". Journal of Eating Disorders. 9 (1): 136. doi:10.1186/s40337-021-00479-5. ISSN 2050-2974. PMC 8529812. PMID 34674763.
- ^ Makino M, Tsuboi K, Dennerstein L (September 2004). "Prevalence of eating disorders: a comparison of Western and non-Western countries". MedGenMed. 6 (3): 49. PMC 1435625. PMID 15520673.
- ^ Hay PJ, Mond J, Buttner P, Darby A (February 2008). Murthy RS (ed.). "Eating disorder behaviors are increasing: findings from two sequential community surveys in South Australia". PLOS ONE. 3 (2): e1541. Bibcode:2008PLoSO...3.1541H. doi:10.1371/journal.pone.0001541. PMC 2212110. PMID 18253489.
- ^ van Son GE, van Hoeken D, Bartelds AI, van Furth EF, Hoek HW (December 2006). "Urbanisation and the incidence of eating disorders". The British Journal of Psychiatry. 189 (6): 562–3. doi:10.1192/bjp.bp.106.021378. PMID 17139044.
- ^ "Bulimia". finddoctorsonline.com. Archived from the original on 2012-07-09.
- ^ Grohol J (March 19, 2009). "Black Girls At Risk for Bulimia". Archived from the original on May 24, 2012.
- ^ Silén, Yasmina; Keski-Rahkonen, Anna (2022). "Worldwide prevalence of DSM-5 eating disorders among young people". Current Opinion in Psychiatry. 35 (6): 362–371. doi:10.1097/YCO.0000000000000818. PMID 36125216.
- ^ a b Tölgyes T, Nemessury J (August 2004). "Epidemiological studies on adverse dieting behaviours and eating disorders among young people in Hungary". Social Psychiatry and Psychiatric Epidemiology. 39 (8): 647–54. doi:10.1007/s00127-004-0783-z. PMID 15300375. S2CID 23275345.
- ^ Franko DL, Becker AE, Thomas JJ, Herzog DB (March 2007). "Cross-ethnic differences in eating disorder symptoms and related distress". The International Journal of Eating Disorders. 40 (2): 156–64. doi:10.1002/eat.20341. PMID 17080449.
- ^ McBride H. "Study Reveals Stunning Prevalence of Bulimia Among African-American Girls". Archived from the original on February 10, 2012.
- ^ Machado PP, Machado BC, Gonçalves S, Hoek HW (April 2007). "The prevalence of eating disorders not otherwise specified". The International Journal of Eating Disorders. 40 (3): 212–7. doi:10.1002/eat.20358. hdl:1822/5722. PMID 17173324.
- ^ Vilela JE, Lamounier JA, Dellaretti Filho MA, Barros Neto JR, Horta GM (2004). "[Eating disorders in school children]" [Eating disorders in school children]. Jornal de Pediatria (in Portuguese). 80 (1): 49–54. doi:10.1590/S0021-75572004000100010. PMID 14978549.
- ^ Lahortiga-Ramos F, De Irala-Estévez J, Cano-Prous A, Gual-García P, Martínez-González MA, Cervera-Enguix S (March 2005). "Incidence of eating disorders in Navarra (Spain)". European Psychiatry. 20 (2): 179–85. doi:10.1016/j.eurpsy.2004.07.008. PMID 15797704. S2CID 20615315.
- ^ Hay P (May 1998). "The epidemiology of eating disorder behaviors: an Australian community-based survey". The International Journal of Eating Disorders. 23 (4): 371–82. doi:10.1002/(SICI)1098-108X(199805)23:4<371::AID-EAT4>3.0.CO;2-F. PMID 9561427.
- ^ Pemberton AR, Vernon SW, Lee ES (September 1996). "Prevalence and correlates of bulimia nervosa and bulimic behaviors in a racially diverse sample of undergraduate students in two universities in southeast Texas". American Journal of Epidemiology. 144 (5): 450–5. doi:10.1093/oxfordjournals.aje.a008950. PMID 8781459.
- ^ Götestam KG, Eriksen L, Hagen H (November 1995). "An epidemiological study of eating disorders in Norwegian psychiatric institutions". The International Journal of Eating Disorders. 18 (3): 263–8. doi:10.1002/1098-108X(199511)18:3<263::AID-EAT2260180308>3.0.CO;2-O. PMID 8556022.
- ^ Garfinkel PE, Lin E, Goering P, Spegg C, Goldbloom DS, Kennedy S, et al. (July 1995). "Bulimia nervosa in a Canadian community sample: prevalence and comparison of subgroups". The American Journal of Psychiatry. 152 (7): 1052–8. doi:10.1176/ajp.152.7.1052. PMID 7793442.
- ^ Suzuki K, Takeda A, Matsushita S (July 1995). "Coprevalence of bulimia with alcohol abuse and smoking among Japanese male and female high school students". Addiction. 90 (7): 971–5. doi:10.1046/j.1360-0443.1995.90797110.x. PMID 7663319.
- ^ Heatherton TF, Nichols P, Mahamedi F, Keel P (November 1995). "Body weight, dieting, and eating disorder symptoms among college students, 1982 to 1992". The American Journal of Psychiatry. 152 (11): 1623–9. doi:10.1176/ajp.152.11.1623. PMID 7485625.
- ^ Douglas Harper (November 2001). "Online Etymology Dictionary: bulimia". Online Etymology Dictionary. Archived from the original on 2008-06-17. Retrieved 2008-04-06.
- ^ Giannini, A. J. (1993). "A history of bulimia". In The Eating disorders (pp. 18–21). Springer New York.
- ^ a b c d e f g h i j k l m n o p q Russell, G. (1997). The history of bulimia nervosa. D. Garner & P. Garfinkel (Eds.), Handbook of Treatment for Eating Disorders (2nd ed., pp. 11–24). New York, NY: The Guilford Press.
- ^ a b c d Russell G (August 1979). "Bulimia nervosa: an ominous variant of anorexia nervosa". Psychological Medicine. 9 (3): 429–48. doi:10.1017/S0033291700031974. PMID 482466. S2CID 23973384.
- ^ Palmer R (December 2004). "Bulimia nervosa: 25 years on". The British Journal of Psychiatry. 185 (6): 447–8. doi:10.1192/bjp.185.6.447. PMID 15572732.
- ^ a b c d e f g Casper RC (1983). "On the emergence of bulimia nervosa as a syndrome a historical view". International Journal of Eating Disorders. 2 (3): 3–16. doi:10.1002/1098-108X(198321)2:3<3::AID-EAT2260020302>3.0.CO;2-D.
- ^ a b Kendler KS, MacLean C, Neale M, Kessler R, Heath A, Eaves L (December 1991). "The genetic epidemiology of bulimia nervosa". The American Journal of Psychiatry. 148 (12): 1627–37. doi:10.1176/ajp.148.12.1627. PMID 1842216.