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CARBOHYDRATES: The bulk energy provider

Carbohydrates are available commonly in the form of starch,
glucose, cane sugar, milk, etc. Grains, roots, and tubers are
composed of starch which is a complex carbohydrate. Wheat and corn
form the chief sources of this food group...More
FATS: The concentrated energy source

Weight, more than twice the energy provided by either protein
or carbohydrate, imparts palatability to the diet and retards
stomach emptying time. Fats are important for the absorption of
vitamin A and ß-carotene in the diet. Fats derived from vegetable
sources provide essential fatty acids which have vitamin-like
functions in the body and are important for the structure &
function of cells and tissues...More
PROTEINS: The body building foods

Protein content is a measure of adequacy & quality of a diet. The
proteins are broken down into amino acids and partly absorbed as
such. These amino acids and proteins are needed for various body
functions like tissue building, replacement of depleted proteins,
& synthesis of functional molecules like enzymes, hormones, and
antibodies...More
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