Now for me, it is any meat but I used to have problems eating fish prior to giving up meat completely.
And... spaghetti shaped noodles. I used to get a gag reflex from trying to eat them but now, I get a gag reflex from even looking at them or a picture of them. My husband loves spaghetti so my mother in law will give him boxes of it and I refuse to cook it. Instead, I make other pasta for him.
You can't out-exercise poor eating habits.