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Digestion and Absorption
Use of Food Reserves
1 question from 1 paper, each with its answer.
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Concepts tested
- Order of utilisation of energy reserves
All Questions
2003 AIPMT 1 question
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During prolonged fasting, in what sequence are the following organic compounds used up by the body : -Carbohydrates are the first source of energy. The small glycogen reserve of the liver and muscles is used up within about a day of fasting.
Next, the body uses fats stored in adipose tissue; fats are the main long-term energy reserve and can last for weeks.
Proteins are used last, since they are structural and functional components (muscles, enzymes). When proteins are broken down in large amounts, muscles waste away; this happens in the final stage of starvation.
So the sequence is: first carbohydrates, next fats and lastly proteins.