For me an example would be black tea - no sugar, cream or milk.
I would say there are many foods I refused to try as a child that I love now. I don't think I could say I "despised" them, but probably said "ewww...no!" many times before I actually ate them. This would be many vegetables, fruits, and seafood.
mushrooms
water
I used to despise French kisses (as a teenager mostly). Now I love them (because the conditions are better).
Old age.
Perfectly me.