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Heat is generated in the body as a byproduct of metabolism. No process is 100% efficient, and heat is generated as a waste product. Muscle contraction uses ATP, and a portion of the energy is wasted as heat. All biochemical reactions in the body generate heat as a byproduct. Some people have a higher metabolic rate, because they have a futile cycle. One reaction synthesizes a product, and another reaction breaks it down. And so energy is wasted without accomplishing anything. The wasted energy is released as heat.

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