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There are three principal classes of [[nutrient|macronutrients]]: [[carbohydrate]], [[Protein (nutrient)|protein]], and [[lipids|fat]].<ref>{{cite journal |last1=Prentice |first1=Andrew M |title=Macronutrients as sources of food energy |journal=Public Health Nutrition |date=October 2005 |volume=8 |issue=7a |pages=932–939 |doi=10.1079/PHN2005779 |pmid=16277812 |doi-access=free }}</ref> Macronutrients are defined as a class of [[chemical compounds]] which humans consume in relatively large quantities compared to vitamins and minerals, and which provide humans with [[food energy|energy]]. Fat has a [[food energy]] content of {{convert|9|kcal/g|kJ/g|order=flip|abbr=off}} and proteins and carbohydrates {{convert|4|kcal/g|kJ/g|order=flip|abbr=on}}.<ref>{{cite web|url=http://www.fao.org/docrep/006/Y5022E/y5022e04.htm|title=Chapter 3: Calculation Of The Energy Content Of Foods – Energy Conversion Factors|publisher=Food and Agriculture Organization of the United Nations|accessdate=30 March 2017}}</ref>
There are three principal classes of [[nutrient|macronutrients]]: [[carbohydrate]], [[Protein (nutrient)|protein]], and [[lipids|fat]].<ref>{{cite journal |last1=Prentice |first1=Andrew M |title=Macronutrients as sources of food energy |journal=Public Health Nutrition |date=October 2005 |volume=8 |issue=7a |pages=932–939 |doi=10.1079/PHN2005779 |pmid=16277812 |doi-access=free }}</ref> Macronutrients are defined as a class of [[chemical compounds]] which humans consume in relatively large quantities compared to vitamins and minerals, and which provide humans with [[food energy|energy]]. Fat has a [[food energy]] content of {{convert|9|kcal/g|kJ/g|order=flip|abbr=off}} and proteins and carbohydrates {{convert|4|kcal/g|kJ/g|order=flip|abbr=on}}.<ref>{{cite web|url=http://www.fao.org/docrep/006/Y5022E/y5022e04.htm|title=Chapter 3: Calculation Of The Energy Content Of Foods – Energy Conversion Factors|publisher=Food and Agriculture Organization of the United Nations|accessdate=30 March 2017}}</ref>


Water makes up a large proportion of the total mass ingested as part of a normal diet, but it does not provide any nutritional value. [[Alcoholic drink#Food energy|Ethanol]] provides calories, but there is no requirement as an essential nutrient.
Water makes up a large proportion of the total mass ingested as part of a normal diet, but it does not provide any nutritional value. [[Alcoholic drink#Food energy|Ethanol]] provides calories, but there is no requirement for ethanol as an essential nutrient.


===Carbohydrates===
===Carbohydrates===

Revision as of 07:09, 8 August 2022

This list is a categorization of the most common food components based on their macronutrients. Macronutrients can refer to the chemical substances that humans consume in the largest quantities (See Nutrient)

Macronutrients that provide energy

There are three principal classes of macronutrients: carbohydrate, protein, and fat.[1] Macronutrients are defined as a class of chemical compounds which humans consume in relatively large quantities compared to vitamins and minerals, and which provide humans with energy. Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per gram) and proteins and carbohydrates 17 kJ/g (4 kcal/g).[2]

Water makes up a large proportion of the total mass ingested as part of a normal diet, but it does not provide any nutritional value. Ethanol provides calories, but there is no requirement for ethanol as an essential nutrient.

Carbohydrates

Protein

Essential and non-essential amino acids

Fats

Saturated (i.e., stable)[3] fatty acids

Monounsaturated (i.e., semi-stable) fatty acids

Polyunsaturated (i.e., unstable) fatty acids

Essential fatty acids

Alcohol

Macronutrients that do not provide energy

Water

Water is essential for life. It provides the medium in which all metabolic processes proceed. It is necessary for the absorption of macronutrients and micronutrients, but it provides no nutritional energy.

Fiber

Dietary fiber from fruits, vegetables and grain foods. Insoluble dietary fiber is not absorbed in the human digestive tract, but is important in maintaining the bulk of a bowel movement to avoid constipation.[4] Soluble fiber can be metabolized by bacteria residing in the large intestine.[5][6][7] Soluble fiber is marketed as serving a prebiotic function with claims for promoting "healthy" intestinal bacteria.[8] Bacterial metabolism of soluble fiber also produces short-chain fatty acids like butyric acid, which may be absorbed into intestinal cells as a source of food energy.[5][6][7]

See also

References

  1. ^ Prentice, Andrew M (October 2005). "Macronutrients as sources of food energy". Public Health Nutrition. 8 (7a): 932–939. doi:10.1079/PHN2005779. PMID 16277812.
  2. ^ "Chapter 3: Calculation Of The Energy Content Of Foods – Energy Conversion Factors". Food and Agriculture Organization of the United Nations. Retrieved 30 March 2017.
  3. ^ "Nutrition in Preventative Medicine". Health Science Center, University of Texas. Retrieved 29 December 2021.
  4. ^ "High-Fiber Diet - Colon & Rectal Surgery Associates". www.colonrectal.org. Retrieved 2020-08-16.
  5. ^ a b Vital M, Howe AC, Tiedje JM (April 2014). "Revealing the bacterial butyrate synthesis pathways by analyzing (meta)genomic data". mBio. 5 (2): e00889. doi:10.1128/mBio.00889-14. PMC 3994512. PMID 24757212.
  6. ^ a b Lupton JR (February 2004). "Microbial degradation products influence colon cancer risk: the butyrate controversy". The Journal of Nutrition. 134 (2): 479–82. doi:10.1093/jn/134.2.479. PMID 14747692.
  7. ^ a b Cummings JH, Macfarlane GT, Englyst HN (February 2001). "Prebiotic digestion and fermentation". The American Journal of Clinical Nutrition. 73 (2 Suppl): 415S–420S. doi:10.1093/ajcn/73.2.415s. PMID 11157351.
  8. ^ Brownawell AM, Caers W, Gibson GR, Kendall CW, Lewis KD, Ringel Y, Slavin JL (May 2012). "Prebiotics and the health benefits of fiber: current regulatory status, future research, and goals". The Journal of Nutrition. 142 (5): 962–74. doi:10.3945/jn.112.158147. PMID 22457389.
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