Side effects you've experienced with food?

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What are some horrible side-effects you've experienced with food?

For example, every time I eat PB & J, I drink LOTS of water for days on end. Or if I have milk, it makes me fall asleep like clockwork. What are some of your least-favorite side effects that aren't necessarily allergies, but more of an inconvenience?
Side effects you've experienced with food?
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