I'm sadly allergic to alliums. Onions, garlic, shallots: you name it, it wrecks my guts. The massive downside, beyond how they're in everything, is my partner stopped eating them too and couldn't stand them except in small amounts. They lost their tolerance for the flavor, so anything with a normal amount of onions tasted overpowering. I experience the same, so at least I immediately know if something has alliums in it.