carbohydrate (redirected from dietary carbohydrate)

carbohydrate /car·bo·hy·drate/ (kahr?bo-hi´drat) any of a class of aldehyde or ketone derivatives of polyhydric alcohols, so named because the hydrogen and oxygen are usually in the proportion of water, Cn(H2O); the most important comprise the starches, sugars, glycogens, celluloses, and gums.

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car·bo·hy·drate (kärb-hdrt)

n.

Any of a group of organic compounds that includes sugars, starches, celluloses, and gums and serves as a major energy source in the diet of animals; they are produced by photosynthetic plants and contain only carbon, hydrogen, and oxygen, usually in the ratio 1:2:1.

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carbohydrate

a compound of carbon, hydrogen and oxygen, the latter two usually in the proportions of water (CH₂O)_n. They are classified into mono-, di-, tri-, poly- and heterosaccharides. Carbohydrates in food are an important and immediate source of energy for the body; 1 gram of carbohydrate yields 3.75 calories (16 kilojoules). They are present, at least in small quantities, in most foods, but the chief sources are the sugars and starches of plants. Herbivores are able to utilize the insoluble polysaccharides (crude fiber) because of bacterial conversion to volatile fatty acids by fermentation in the rumen and cecum.

Carbohydrates may be stored in the body as glycogen for future use. If they are eaten in excessive amounts they are converted to and stored as fat. Rapid ingestion of very large amounts in ruminants and horses causes carbohydrate engorgement.

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complex carbohydrate

polysaccharides containing either a- and ß-type glycosidic bonds. Usually occurring in mixtures in food.

dietary carbohydrate

the carbohydrate components of food.

carbohydrate loading

depletion/repletion means of maximally loading glycogen into type II muscle for increased power of muscle contraction.

carbohydrate loss

glucose loss in urine due to diabetes mellitus or chronic renal disease.

carbohydrate metabolism

series of related enzymic reactions involved in the synthesis and catabolism of carbohydrates.

carbohydrate tolerance test

see glucose tolerance test.

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carbohydrate Nutrition An abundant organic compound, which is one of the 3 main classes of foods and a principal source of energy; ingested carbohydrates are sugars and starches, which are metabolized into glucose, or assembled into glycogen, and stored in the liver and muscle for future use. See Complex. Cf Fats, Protein.