I don't have any specific food allergies, so the stuff I like that I 'shouldn't eat' is mostly stuff that's bad for anybody; tons of fat, sugar, carbs or what have you.
The only thing I can't handle is having a dish put in front of me where I don't know what it is. I'm not really a picky eater - I'll even eat mushrooms, though I don't much care for the texture - but if I don't know what something is, I won't even try it. Nuh-uh. No mysteries for the Macksteries.