Question

mention the site of complete digestion of Carbohydrate protein and fats in the human beings

Answer 1

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here is your answer:
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The site of complete digestion of carbohydrates, proteins and fats in human beings is $\bf{Small\: Intestine}$
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Answer 2

These are all supply as 90% of the dry weight of the diet and 100% of its energy.

4 calories in a gram of carbohydrate or protein.

9 calories in a gram of fat

These nutrients also differ in how quickly they supply energy. Carbohydrates are the quickest, and fats are the slowest.

Carbohydrates, proteins, and fats are digested in the intestine, where they are broken down into their basic units:

Carbohydrates into sugars

Proteins into amino acids

Fats into fatty acids and glycerol

The body uses these basic units to build substances it needs for growth.