I just had my gallbladder out last week, in a bit of unplanned surgery, and as of now I can’t even deal with butter. It gets better, right? Right?
A banana on an empty stomach will make me throw up–I’ve been that way since childhood.
Hereditary hemochromitosis, so like Chronos, stay away from high iron stuff.
I am hypoglycemic, which I suppose means pre-diabetic, and have been ordered to take it easy on the carbs.
My gallbladder was removed 20ish years ago. Immediately after surgery, I followed the dietician’s handout religiously. A few weeks later I strayed without dying. Maybe two months postop I was back to a totally normal diet.
Grapefruit is the only thing I can think of. I don’t take cholesterol drugs, but grapefruit interacts with lots of medicines, even Allegra and Claritin!
It does. I had mine out 14 years ago, and fat only bothered me for a short time after.
Yeah.
I love grapefruit, will peel and eat them like an orange (which I can’t have) but during allergy season when I’m on a maintenance regimin I have to forego them 
But it’s not a perma-ban so I didn’t list it.
I am medically contraindicated from eating green leafy vegetables. No lettuce, beet greens, or chard.
Really.
Coumadin (warfarin) is counteracted by vitamin K. Green leafy vegetables are rich in vitamin K, so I am supposed to avoid them.
I miss spinach salads. 
Type II Diabetes, so I limit my intake of some things, but really, nothing is off the table.
However, I am sensitive to Soy, so I do have to watch my intake of that. No tofu for me, which is quite alright since I was never a fan.
Oh thank God.
Raw onions almost never fail to give me indigestion, so I avoid them. That’s about it.
Shellfish
Chocolate. Migraines. (I can have a bite or two now and then, a Hershey’s dark chocolate mini-bar or a piece of cake. But I never know when it will be too much. Chocolate lava cake, death by chocolate anything, fudge pie - it’s ‘iffy’.)
Because of the risk of kuru, I cannot eat other human beings.
Alcohol (which interacts very, very poorly with a medication I require) and artificial sweeteners (which are a migraine trigger for me).
That’s about it though.
The majority of my health concerns are linked to a metabolic disorder, which (through extensive physician-monitored trial and error) I’ve demonstrated are largely unaffected by my diet (either positively or negatively), but can mostly be controlled with a variety pack of medications. Go me.
Grapefruit, also due to meds. Which is a total bummer, because I LOVE grapefruit, particularly Texas ruby red.
Lactose-intolerant since infancy, I can eat limited amounts of cheese, sour cream, or ice cream (separately, not together) with only a few mild side effects (phlegm buildup and coughing, queasiness, bloat), but drinking milk just isn’t worth the severe side effects it causes. I no longer even like the smell of milk.
Peanut butter, root beer, fresh coconut, and sometimes bananas are general offenders. Not sure why they make me feel rotten, but they do. Luckily, those four items are easy to avoid.
I follow a low salt diet in an attempt to keep my inner ear fluid pressure down. When it goes up, my hearing gets worse. Each time it gets worse, there’s a chance the damage will stick permanently. So I’m careful about it.
This restricts most baked goods, soups, chips, and a large random assortment of other items.
Milk upsets my digestion, and always has. I assume its a lactose thing. I can eat yoghurt, though.
Like others said, it gets better. For maybe the first two weeks after, my digestive system was a mess. For about the first six weeks I had to be a little careful, but I was able to eat a fairly normal diet. After that I’ve had no real problems at all (nothing that I could tie to the surgery, at any rate).
I’ve been a type 1 diabetic over half my life now (I’m 41 as I write). So anything involving refined sugar is rather frowned upon. Well, unless I actually have low blood sugar. Then it is the best thing for me.
Carbs.
Thank God for peanut butter.
As I get older my list grows. The lactose intolerance is becoming a real issue, I had no idea there was lactose in so many yummy things
I choose to not eat strawberries. I was eating a big bowl of fresh ones when I had the onset of my first serious MS attack (the diagnostic one) and nobody knows if there’s a connection - but I’d rather not test it. I became firm on that after I heard of another lady in my dad’s circle of friends with MS who also seemed to have reactions to raw strawberries.
Because of my migraines, I have to avoid nitrites and nitrates, so I am very careful about the meat and cold cuts I choose. A hot dog is an almost guaranteed bad day for me.
I can’t have wheat, barley or rye gluten. I’m not celiac ( I was tested), but I have Crohn’s, and my doctor says every Crohn’s patient has trigger foods, and they vary from patient to patient.
Finding a good bread substitute is problematic, as it’s all expensive and lousy. I was lucky to find some decent rice-based pasta noodles. I can even eat pizza, since they have gluten-free pizzas out now. They’re small, expensive, and often not very good, but I can have them occasionally. (UDI’s brand seems decent)
I miss Yuengling Porter.