Mostly exhalation. You generally breathe it out.
There is excrement (poo) and urination (pee) and sweat that passes a lot of liquid and solids out of your body, but stored fat doesn’t move back into your digestive tract to leave through the anus or urethra (butt or front genitalia).
Fat is broken down and, at least partially, exhaled through your breath. Probably small numbers of molecules are passed through sweat, but most of the actual “weight” (or mass) is exhaled.
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