Sharts and puking excluded from this question, I mean warm gaseous emissions only, do we gain or lose weight?

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I guess warm breath rises, you can see it in winter when your breath is visible.

However, co2 is not present as a gas in your body, but bound to hemoglobin, so I think it only becomes a gas again in your lungs. Same as farts only forming "outside" your body in your intestines.

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