system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we get sick from eating/drinking unfit products (infected/poisonous/rotting) when our stomachs are full of an acid that can break down most organic substances?
gpt
People get the wrong idea about stomach acid. It's not strong enough to dissolve most things, it's more like the the bottle of dilute HCl in the school chemistry lab than something like battery acid which will cause burns.You don't get burns in your mouth if you throw up, for instance, just a foul taste and maybe some reddening and irritation.

 The acidity does mostly kill organisms in the food but those bacteria will have produced toxins while they were alive. The toxic effects trigger the body to try and get rid of whatever was causing it by emptying out the digestive system as quickly as possible, from both ends usually!