How exactly does food poisoning work? How does the body know that the food is contaminated and which way to expel it out? How does it know when things are safe again?

Question

How exactly does food poisoning work? How does the body know that the food is contaminated and which way to expel it out? How does it know when things are safe again?

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Answer 1

The symptoms associated with a condition called “food poisoning” like vomiting, diarrhea, and fever are probably something like sneezing where there’s a reflex mechanism built into the nervous system triggered by your immune system’s response. The immune system is constantly active, so it’s not that your body “knows” it’s safe again, really a matter of “when is the stuff causing you to feel sick (an allergen/pathogen/etc.) out of your body?” and “when do you feel well again enough to eat/go outside/etc?”