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Carbohydrates are primarily utilised at the time of respiration. Its because they are a rich source of energy liberating 4kCal/g. Proteins also liberate the same amount of energy but they are used as the last source of energy considering their role as building blocks of the body. Fats liberate 9kCal/g but are used as reserve food in times of starvation since their utilisation is a slightly more complex process.

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16y ago

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