I’ve heard you literally poo and wee it out
In: Biology
You’ve heard wrong. Almost none of the fat leaves your body through urine or feces.
You breathe it out.
Your body converts stuff into energy by reacting it with the oxygen you breathe. The stuff we eat is almost entirely made out of carbon and hydrogen, with a bunch of other elements thrown in the mix in low amounts. Your body gets energy from the carbon and hydrogen by extracting energy from them as they react with oxygen to turn into carbon dioxide and water.
That description is very simplified, but it does accurately describe the end results of metabolizing the food you eat or fat that was already present in your body.
You may have noticed that taking a fuel that has a bunch of carbon and hydrogen and lighting it on fire does the same thing. The fuel turns into carbon dioxide and water and releases the energy that you see and feel as heat. When people talk about burning calories or burning fat, that’s a metaphor, of course, but it actually isn’t that far from the truth.
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