Eli5; How do smells make us nauseous?

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Other than ‘just because it smells bad’ how does a putrid smell make somebody throw up? I could understand someone tasting something that’s gone rotten, because the body’s response would be to purge. But smelling it makes no sense. Please help me to understand.

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Anonymous 0 Comments

Negative sensations is essentially your body’s defense system in a nutshell. Putrid smells indicate substances that will make us ill if consumed. For your example, it’s probably because the body knows how it will react after tasting it, so you feel the initial effects from the smell alone.

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