Well, I inherited Coelic's Disease from my mothers side of my family (Quite recently too) and now can't have anything with wheat in (A lot of things) so, bread, pizza, pie, most crisps, cake, cookies, muffins, sugarpaper (It IS a food), pasta, most junk food, some ice creams and most things with a thick sauce like gravy or bolognse sauce.
So yeah lots of stuff and Gluten free stuff is like 4x the price of normal stuff. :'(