Can't eat: pistachios, pine nuts, acorns, and probably cashews (the last is related to the first in this list). I am worried about chestnuts as they are related to acorns.
Can't eat: White "tuna", aka Escobar. Does the same thing to me as the aforementioned can't-eat tree nuts do.
Can't eat: fiddlehead ferns (sigh).
Hard to eat but they just sit around and knock at my stomach walls: nearly all commercial cookies, pastries, donuts. Most junk-style candy bars. The only commercial cookie I can eat more than one of, is Walker's Shortbread cookie - original type, only. Only ingredients: flour, butter, sugar. My system can handle that.
Won't eat, and possibly can't: hazelnuts in any shape, manner or form. I dislike them to begin with, and now with a somewhat selective tree nut sensitivity, i would severely hate and resent getting painfully sick on a nut I already despise.
Won't eat: Endangered species. Stinky tofu. 100 year old eggs. I will take at least a taste of nearly anything else - which is why I know acorns are off my table. Smoked silkworm cocoons are also a true NO, but I'm not sure whether this was because of the cocoon or the smoking agent. I am picky about how some foods are prepared - I don't mind carrots if the life force is cooked out of them, but I dislike them raw. (Parsnips are okay...) Liver, also, has to be make into a pate or something otherwise tasty. Not interested in milk or white chocolate. Definitely not interested in eating most dried fruits, and I don't want dates in any form or presentation. Cottage cheese needs to be COOKED into something.