Potatoes. Egg yolks that have been cooked hard (love them soft though). Uncooked cheese. Liver other than calves' or chicken. Cinnamon by itself (okay in a spice mix). I can force most of these down for politeness other than potatoes and raw cheese, but I'd much rather not.
One of the low points of my life was when, as a nicely behaved and eager to please ten year old, I was sent to stay with a friend of my mother's when mum was having a hysterectomy. The whole family gathered round to watch me eat the evening meal - omelette topped with grated cheese, and chips. Had mum forgotten to tell them what I wouldn't eat? Or had she told them and they'd forgotten, or deliberately chosen to ignore? I ate - or rather, swallowed without chewing - a bit, claimed I was full, and went to bed very hungry.