I wanted to just jump in and say to DominoRose that I understand exactly what you are saying when wondering how to apply AVRT to eating disorders. The way I figured it out is to believe that it is not [I]eating[I] you are trying to abstain from, since this is obviously, as you stated, impossible, but that you are abstaining from the DISORDER I would say that "i will not purge, I will not binge, ever" It is only the disorder you want to be rid of, not food altogether. The way I did this is to learn about healthy eating and exactly follow those rules. It is and it isn't just as hard as it sounds. So, daily, I eat healthy food in healthy amounts, I do not purge (even if I feel I ate too much - this is your AV because if you are following a precise, healthy eating plan, you KNOW you are not actually eating too much, but your AV will convince you that you are) and therefore, I also never binge.
I hope this helps a bit. I hope you are doing well