I can't eat or stand the smell of bananas. Hubby eats them and I'll buy them for him, but he has to wash his hands afterwards, not expect me to kiss him or come close until the smell has gone, and he has to chop up the skin for the compost heap. Just the smell makes me gag. I can't have them hidden in things either, so a chocolate cake with banana in it is out of the question.
I also can't have pineapple, though thankfully the response isn't the same to the smell and hubby doesn't eat pineapple at home at all.
I grew up able to consume dairy and lived on it because I've never been able to drink squash or soda and various fresh fruit juices. fruitS milk was my main drink. But in my early 20's I developed an allergy (not intolerance) to cows milk. I switched over to goats milk, goats butter, goats cream, goats yoghurt, goats ice cream and so on and was fine for about a decade or so on that and sheep's milk. We were able to buy both, though goats milk was easier to obtain than fresh sheep's milk. Sheep's milk cheese, easy but not so easy sheep's milk.... then 15-17 years ago that allergy got very severe almost overnight after I got ill. Since then any dairy product or component of milk (casein or whey protein, it lactose monohydrate (a filler in medication) now causes me anaphylactic shock and is a complete and utter no go. I've epi-pens, and various other medications to treat the anaphylaxis with, places I frequent know where I keep my epi-pens as do people I'm with routinely, just in case I'm unable to respond or get to them myself.