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I think that's standard with food. When you first encounter it, the body's normal reaction is "WTF is this?! It's going to kill me!!", then the second time it's more like "Hmmm I don't know about this, but it didn't kil me last time". Then eventually you learn to like the food.
Meanwhile, many allergies are not actually caused by the thing you reacted to, but to something else. Your body just associates the bad effect with something that else alongisde it. For example, a seafood allergy can develop after eating bad seafood - but it doesn't happen until after. The time you eat bad seafood will be largely uneventful, maybe you have a bit of a dodgy poo, but then the next time you eat seafood you will have a bad allergic reaction. Your body detected the harmful substance that came with the bad seafood, then associates the harm with all seafood, such that all seafood is then rejected.