If you are addicted to drugs, you can stop taking drugs and survive. If you are addicted to alcohol, you can stop drinking alcohol entirely, and survive. If you are addicted to eating, however, you cannot completely give up food - you still need to take in nourishment. That, I imagine, is what makes this type of addiction so difficult to overcome.
No, but substituting a big plate of veggies for your thrice-daily Bucket O' Lard is a good start.