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Question

Biology Question on Digestion and absorption

During prolonged fastings, in what sequence are the following organic compounds used up by the body ?

A

First carbohydrates, next fats and lastly proteins

B

First fats, next carbohydrates and lastly proteins

C

First carbohydrates, next proteins and lastly lipids

D

First proteins, next lipids and lastly carbohydrates

Answer

First carbohydrates, next fats and lastly proteins

Explanation

Solution

During prolonged fasting, first carbohydrates are used up then fats and proteins are used at the last. Carbohydrate and fat metabolism can easily produce energy than protein and they follow a more or less simpler pathway to enter into TCA cycle. When all carbohydrates of the body are used up then fats are converted into carbohydrates and when all fats are used up then ultimately proteins of the body are converted into carbohydrates to be used up by the body.