A 300-pound fat person burns more calories than does a 150-pound thin person because he requires more energy to move his body weight around, pump blood, and perform other functions. Don't conclude, however, that this fat person needs twice as many calories. On a pound-per-pound basis, the average fat person burns fewer calories than the average thin person, for three reasons.
First, he has a thick adipose fat layer, which insulates the body, reducing heat loss and therefore reducing the number of calories needed to regulate body temperature. Second, a fat person is typically less active than a thin person. Third, a fat person has a higher fat-to-muscle ration. This means he needs fewer calories because fat cells require fewer calories than protein-rich muscle tissue to function and survive.
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