Mrsmurph, I'm having similar "compulsive consumption" problems now that I've stopped drinking. It's an issue I had as a kid, too - food, soda, whatever, I had to have far more of it than was good for me. When I hit college I switched to alcohol, now that I'm not drinking it's right back to food/soda/etc.
Now that I'm aware of it, I can do something about it. Meeting with a therapist, getting treated for OCD, trying to be mindful of my compulsions.