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?
Your body burns sugar to make energy, including heat. That’s not just a euphemism: the chemical process of converting sugar to energy is the same in your body as it is if you set it on fire. Sugar breaks down in the presence of oxygen to make carbon dioxide and energy.
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