The energy to generate heat has to come from somewhere. Is it the friction of the blood pumping through the veins and tissues in your body? Is there some kind of chemical heat generation at the cellular level? Where does the heat come from?
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We use the expression to “burn calories” for a reason: your cells are harnessing the very same combustion process as fire to turn the food you eat into energy. In addition to the chemical energy created by your cells in this reaction, thermal (heat) energy is also released.
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