Catholics also have patron saints for nearly everything from infants to ice skaters that they pray to but that are totally not gods because there is only one god. I mean, yeah, their second most important prayer is directed at the Virgin Mary, but that doesn’t mean they worship her or anything.
I don’t think I do know actually. But here’s an attempt at answering this question anyway:
We are usually very quick at relating sickness or even discomfort to the food we ate at the time or slightly before. This is a very valuable trait to avoid food that is unhealthy or even poisonous. But it’s only based on correlation, so it can turn us off food that is not actually causing the sickness but we just happened to eat at the time.