Contrary to common belief, you do not sweat or "poop out" most of your body fat. Based on the calculations of a 2014 research paper, 84% of the fat you lose is turned into carbon dioxide and leaves your body through your lungs by breathing [1].
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The remaining 16% becomes water, which can be lost in many ways like sweat, urine or any other bodily fluid. This basically means that actual "fat loss" primarily occurs when you breathe. So don't hold your breath! 😉