I think you could say that certain types of food are an obsession for me. Whenever a new type of snack, candy, or especially a new type of soft drink comes out, I just HAVE to try it. I'm also more likely to pay attention to packaging and ingredient labels and stuff (and not just because I'm diet-conscious). And I post on the "Salute to Soda" and "BevNet" message boards.
Of course, I also have an insatiable appetite. I used to be pickier about my food (I used to only eat chicken in McNugget form, and only eat cheese on pizza), but not so much anymore. Of course, there are certain foods I love above all - spicy Chinese and Mexican food, certain Hungarian dishes, pasta, etc.