I can really relate to the hungry ghost thing. As someone pointed out, we are not literally hungry ghosts when we are in the human realm, but I sometimes feel I have recenly (in a past life) been liberated from that realm, or are destined for it if I don't smarten up. At least you have a physiological reason that leads to your suffering in this area, for me there is no excuse but the power of my lobha (greed) and the weakness of wholesome factors that give rise to abstinence from obsessive munching (at work at my language school, where I munch between every lesson I teach, no one else does like me.) According to classical Theravada, people are born with a different preponderance of the 6 roots (greed, aversion and delusion on the unwholesome side, generosity, friendliness and wisdom on the wholesome side.) It is a good way to understand that we are born with certain tendencies, and to change the direction of the tendencies involves the kind of effort that the Buddha refers to as changing the flow of the Ganges to make it go upstream or something like that. It's tough. So let's not be too hard on ourselves and expect the powerful, conditioned flow of our tendencies to change overnight) but let's continue to talk to Dhamma friends when our behaviour has been out of control. They can help encourage us to fight the good fight to weaken the power of our unwholesome tendencies, whether that relates to unwise eating or unwise sex or lying or stealing or whatever...
How about a reward system? For example, if I have behaved in some way that goes against my moral standards, I don't let myself study deep Dhamma teachings the rest of that day, I only touch Dhamma books if I have behaved in a way that shows that I take behaviour seriously. I don't want to use the Dhamma as a feelgood mind candy to justify unwise behaviour by seeing it as anatta, conditioned etc... So at the end of a day when I have behaved in the way I have vowed to, reading a Dhamma book at bedtime feels like I am reading it with due respect to the Buddha, that I have been able to improve my behaviour in the light of his teaching.
Looking at the Buddhist teaching on nutriments could be interesting too. What we "eat" is not just food, according to the Buddha, but all sensory objects, and other factors too... http://www.accesstoinsight.org/lib/auth ... el105.html