In my area, they recently aired a commercial on Overeaters Anonymous (oa.org). So, you know, I decided to see just how AA-inspired they were. I found this on their Twelve Traditions page (these are items #2 and #3). Note the highlighted #2.
2.For our group purpose there is but one ultimate authority — a loving God as He may express Himself in our group conscience. Our leaders are but trusted servants; they do not govern.
3.The only requirement for OA membership is a desire to stop eating compulsively.
These two statements are, of course, completely contradictory. If a belief in god is required, then wanting to stop eating compulsively really isn't their only requirement for membership. And putting up with that obsequiously bit about them "only being trusted servants" might really be too much to tolerate for someone who otherwise really needs their help.
This theme of course is repeated elsewhere on their site. I'm sure they help a lot of people, but they certainly aren't as open to everyone as they claim, and they should stop pretending they are.