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

1. First proteins, next lipids and lastly carbohydrates
2. First carbohydrates, next fats and lastly proteins
3. First fats, next carbohydrates and lastly proteins
4. First carbohydrates, next proteins and lastly lipids

Correct answer: First carbohydrates, next fats and lastly proteins

Solution

In prolonged fasting, the body first uses readily available carbohydrates, mainly glycogen. Once those are depleted, it shifts to fat stores for energy, and proteins are broken down last because they are essential structural and functional molecules.

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