system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does your mouth water before you throw up?

I recently had food poisoning, and every time I threw up, I had the obvious I'm-about-to-throw-up-and-I-know-it feeling, my mouth started to water an extreme amount about a minute before I threw up. It was an easy giveaway to get to the trash can, but why does it happen?
gpt
The stomach acid that is about to pass through your mouth could damage your teeth. Your body knows it's about to throw up. So in order to protect your teeth, your mouth produces some saliva to help protect your teeth. It will help dilute the acid, and cover your teeth to make sure the acid doesn't stick to it.