Eli5: Why do we puke when we *see* something disgusting, although there’s no sign it has actually entered or interfered with our body?
In: Biology
Well why is someone puking? Perhaps they ate spoiled food, or drank bad water. Now if you’re a human living thousands of years ago, there’s a pretty good chance that you ate the same food and drank the same water as your puking friend. *Maybe* you’d be fine, but evolution has decided that it’s better to play things safe. Worst case, you need to hunter-gather a new meal.
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