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@Totalanimefan: I can't eat fish, for one. Shellfish or normal fish. Red, white. Doesn't matter, I get sick all the same. Even the smell makes me dizzy. I'm lactose intolerant, and get stomach troubles if I ingest eggs or honey. I also physically cannot stand the taste/texture of raw or large chunks of tomatoes, asparagus, brussel sprouts, bell peppers, zucchini... Honestly, the list could go on if I included everything that triggered a texture or taste response.
By which I mean, physically gagging and/or spitting out the food on reflex, not just wrinkling my nose and going "bleh". If I force myself to eat something with a taste/texture trigger I'll get violently ill. It's very unpleasant.
I have a delicate sense of smell which makes sneaking food past me very difficult as well. Growing up, my mother would try to sneak foods into my meals to get me 'used to it', and even if it was the tiniest amount I'd always get sick.
Like the Princess and the Pea, but... With food.