I understand at a very basic level that when we lose weight, our bodies burn fat stores for energy. But since we don’t have a little fire actually going on in our bodies, where does this fat go? How do we ‘excrete’ these pounds and pounds of fat and not ever see where it goes? Same thing with atrophied or “lost” muscle – where does it go?
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The body breaks it down and uses its nutrients for creating cells, creating fuel for cells, etc
Human bodies are pretty efficient machines. With muscle atrophy, the body goes “huh, not using this system anymore” so it starts to break the muscles down into base proteins, which it then uses to create cells in other systems that are being used.
The rest that isnt used up by the body is expelled in waste, generally urine
Think of it like taking apart a lego set, so you can use those legos for other creations
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