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Believe it or not, it's also largely where the weight exits, as the C part in CO2. Something like 85% of it.

> An adult typically removes approximately 0.8 to 0.9 kilograms (840 to 900 grams) of CO2 from the body each day.

https://biologyinsights.com/how-much-carbon-dioxide-do-we-ex...

Ok, that is way more than the dozen grams per day I thought it was.

It's one of those initially unintuitive things that makes perfect sense when you consider that "burning calories" is... pretty literally burning calories. Of course CO2 is how most of the mass goes away.

Similar to the "trees are mostly made from air" thing.

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