Elvis,
I have not used AVRT with anything except substance addiction, so I can't comment on eating, although they do have an older book on the subject. I did tackle smoking at the same time as drinking though, and I abstain from all mood altering substances, since they all feed the Beast, which only wants synthetic pleasure. Strictly speaking, I am fairly certain that since AVRT refers to drinking and using almost synonymously, that within the AVRT paradigm, there is no difference between alcohol and other drugs.
I did make an exception in my Big Plan for caffeine, though. :-)