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Answers to your seven most pressing questions about poop
6. What’s with the smell?
Poop stinks. There’s no denying that. The reason partly goes back to the whole evolutionary thing I mentioned before. But it’s also related to certain chemicals in our food.
Chemicals called methyl sulfides from foods like cabbage make our poop particularly rank. So does hydrogen sulfide, a chemical best known for creating that rotten egg smell you catch wind of every time you pass a garbage dump. When your body breaks down tryptophan, it creates an especially stinky chemical called skatole (so keep a candle handy in your bathroom after Thanksgiving). The bacteria in your gut can make your poop stink more too. Some bacteria produce a compound called indole, which also gives coal tar its pleasant scent.