A lot of junk foods and convenience foods that just don't taste that great anymore.
Peanut butter and jelly sandwiches. To be fair, I couldn't eat them often as a child either (sweet things make me ill, so I'd have lots of bad experiences with them that would put me off them for a couple months) but now I feel sick every time I try one. I also used to eat toast with peanut butter, or sometimes peanut butter and jelly, but now the only thing I will put on my toast is margarine and cinnamon sugar.
...I can't think of much that isn't meat (or doesn't fit under the convenience food category above). I was a very picky child and I was constantly eating the same things over and over, getting sick of them, and then eating them again a year or two later. PB&J is one of the only things I can think of that I'm still sick of.