Calories per gram in proteins

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Multiple Choice

Calories per gram in proteins

Explanation:
Proteins provide about 4 kilocalories per gram. This is the amount of energy you get when the body fully oxidizes amino acids. It’s the same general energy value used for labeling, with fat giving about 9 kcal/g and carbohydrates about 4 kcal/g. The reason protein isn’t a higher energy source is that part of the energy must be used to process and excrete the nitrogen from amino acids (deamination), so the usable energy ends up near 4 kcal/g. In practice, proteins are mainly for building and repairing tissues, but they can supply energy when needed.

Proteins provide about 4 kilocalories per gram. This is the amount of energy you get when the body fully oxidizes amino acids. It’s the same general energy value used for labeling, with fat giving about 9 kcal/g and carbohydrates about 4 kcal/g. The reason protein isn’t a higher energy source is that part of the energy must be used to process and excrete the nitrogen from amino acids (deamination), so the usable energy ends up near 4 kcal/g. In practice, proteins are mainly for building and repairing tissues, but they can supply energy when needed.

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