During prolonged fasting, first carbohydrates are used up then fats and proteins are used last. Carbohydrate and fat metabolism can produce energy more easily than protein and they follow a more or less simple 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.
During prolonged fastings, in what sequence are the following organic compounds used up by the body ?
NEET UG 2003 — Botany Biomolecules
2003mcqeasy
During prolonged fastings, in what sequence are the following organic compounds used up by the body ?
Official previous-year question
Held on 30 Apr 2003 · Verified 9 Jul 2026.
Options
- 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
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