Honey mustard pretzels. I haven’t been able to pinpoint whatever ingredient is responsible–I’m able to tolerate plain pretzels, plain honey, and plain mustard with no problems, so I’m assuming it’s a processing additive. But honey mustard pretzels, for whatever reason and without exception, cause nausea and vomiting. Which sucks, because I really like them. It happened 4 times in a row after progressively fewer pretzels before I finally admitted to myself that I couldn’t eat them any more whether I liked them or not.
I had terrible trouble with IBS when I was younger and eventually eliminated tomatoes, citrus fruits, onions, chilli and capsicum from my diet. After a couple of years of that it seemed to right itself and now I am able to eat all those foods again. Yay 
Cannot eat, cannot touch, even a teeny tiny amount of basil. Anywhere my flesh comes in contact with it sprouts hives. Since I haven’t ingested any basil in 15 years (apparently itchy tongue and throat is a bad sign) I mostly only need to dread when people order pizza at work since touching surfaces that people touched without washing their hands first is typically how I end up welted up these days. As you can imagine I’m as excited about pizza parties as most people would be if I gleefully suggested we all do arts and crafts with poison ivy 
I keep very low sodium because of BP issues, and it makes a difference with me.
Yeah, I regard pizza parties in a similar matter, but due to a tomato allergy. I’m with ya on that one, what say you we go out for something like ice cream or something?
Carrageenan. It’s a thickener in dairy products manufacturers wants to cheap out on or make low fat. So almost all ice creams and many sour creams, yogurts, and salad dressings contain it. It’s also injected into deli turkey so that it doesn’t shred when it’s sliced. A couple non-definitive studies have linked it to irritable bowl disease. I have ulcerative colitis and was continuously having symptoms and also consuming carrageenan daily when I read about a possible link. I cut it out of my diet several years ago and have been much improved. It could be a coincidence, of course, but I’m not willing to test that out.
At 55 yrs old (37 of which have been in food service) thankfully I can, and do eat ANYTHING.
I do have a few, very few, items that I prefer not to eat.
OK, Mithras gets the (carrageenan free) pizza and **elfkin477 **and I will go out for ice cream.
Gluten. I was diagnosed with IBS that was getting worse and worse, to the point that I could basically not eat any fruits or vegetables other than the occasional apple and small amounts of cooked carrots without having some serious digestive issues. Also, nothing greasy, nothing spicy, and nothing with a lot of fiber.
New doctor suspected gluten issues, even though I didn’t think it possible since I always seemed okay to eat bread, crackers, etc. But at her suggestion I went gluten free, and the IBS disappeared. It’s been 3 years and it hasn’t come back.
Spinach, broccoli, liver, and alcohol.
Avoiding liver is not a problem.
Agreed. Unfortunately, my doctor decided it’s time I had a colonoscopy (I’m 65, and never did it), so at the end of this month I’ll be spending a few days on a non-food diet: no dairy (cheese!), no nuts (peanut butter!), no whole grains (bread! crackers! oatmeal!), and more! Looking at the list, it seems all I can have for that final day is coffee and beer. (And the laxative, but I don’t want to think about that too much.)
I’m slightly allergic to wheat. If I have too much shredded wheat cereal or Grape-Nuts, my asthma will kick up and I’ll notice that I’m wheezing a bit.
I can’t eat bacon because the nitrites in it give me a headache that will last for a couple of days. Some “country-cured” sliced ham that I bought at the deli department in a local grocery must’ve also used nitrites because it too gave me those headaches, but I didn’t make the connection with the ham until I’d eaten it it a number of times.
Theoretically, there’s a limit to how much fat I can have in one sitting, due to my gallbladder having been removed. However, I can eat a half-chicken from KFC with no ill effects, so I have no idea where that limit is.
No alcohol and keep the fats down because of pancreatitis, and keep the carbs under control because of diabetes. Luckily metformin works for me pretty well. Occasionally I’ll go a little bonkers and eat too much fat, the others are easier for me to keep under control.
Sensitive to mustard, mussels, beer, cod; they trigger asthma. Those are the big ones by ingestion, there are other foods I can have so long as it’s in small amounts and not too often.
I like cod a lot, but I like being able to breathe even more. The beer isn’t so much of a problem; the mustard is a problem with people who apparently think that sauces made from mustard do not contain mustard; the mussels can be a problem when people make “seafood dishes” (paella, seafood salad…).
Also lactose intolerance, but relatively minor. One of my brothers could drink the whole barn with no ill effects, the other one has very high intolerance.
Sorry, but I can (and do) eat any and everything.
I’ve got an intolerance to falafel (but not, oddly enough, chick peas), quinoa and pineapple, which have all come on pretty recently (past 1-2 years). Bugger of it is that I don’t eat meat and 2 of those are pretty much the standard vegie options at most places around. I assume it’s an intolerance or allergy given the digestive effect of even a small amount (cramps and feeling of nausea) but never checked with the doctor.
Most deli/cured meats include sodium nitrite and/or sodium nitrate. I forgot to include these in my earlier post, but I have a sensitivity to them and an unpleasant reaction (faster heartbeat/heart pounding). I don’t seem to have the same issue with the nitrate-free products (that still have naturally occurring nitrates from celery juice and the like). Pepperoni was what identified the cause of the reaction for me - I was moving, got to the new city, ordered a pizza and had the reaction for the first time since before the move. So, I quit eating any products with them.
Oh heavens, what CAN I eat?
Thanks to kidney failure, I had to switch to low-sodium, watch potassium, no phosphates.
I can no longer have milk products, nut products, many fruits, a fair amount of vegetables. I have to watch what kind of meats I eat (deli meats, in particular, tend to use phosphates as preservatives). The only sodas I can have are ginger ale, SOME root beers, and some orange sodas. No beer or wine. Bread has to be white, yeast raised, enriched - no more yummy wheat breads.
And people wondered why I lost 20 pounds so fast…
I eat and drink whatever I want, although I sort of avoid grapefruit for the statin issue (do grapefruit shandy beers count?).
After my first gout episode I tried avoiding gout triggers, but they are all things I love and am willing to suffer for, if need be.