The way your body uses energy is converting things like carbohydrates, fats, and proteins into forms usable by the body. It’s a bit complicated and depends on an understanding of some biology/chemistry topics to get everything, but the “waste product” of the major form of energy generation is carbon dioxide and water, both of which leave the body via exhalation, with water also leaving as sweat and urine.
Fat is mainly made of different structures and configurations of carbon, hydrogen, and oxygen. It gets broken down into pieces usable for the body in a process that generates carbon dioxide, which gets exhaled out.
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