Orchid,
I'm glad you brought this subject up. I am where I am because of a combination of both factors. I went on lowfat~high carb diets in between my yo-yoing and bingeing. I ate enormous quantities!
I'm especially happy you mentioned some of the things you did for food because it helps me admit things I could never tell the outside world. I recently came off an extended 2 month binge and one of the most bizarre things I did was to call up and order a pizza and a few other things. No one was home that night but while I was talking to the guy at the pizzeria, I pretended to be having a conversation with someone so he wouldn't come to the door and think I was eating it all by myself. And I've gone into fast food places and delis and carry-out joints with a list of what 'everyone' else was having.
Feels good to get that off my chest. Thanks!