They have Overeaters Anonymous here but it sure as shit doesn't have the stigma nor attendance that NA or AA do. And mostly it's used by people who have bulimia, not the obese - I believe, because, the first step is to admit one actually has a problem.  That's the main problem, is that they don't realise they have a problem, or rather, they won't accept they have a problem, they don't seem to want to come to terms with the fact that obesity and overeating is destructive and dangerous and unhealthy, the way that drug abuse and alcoholism are. (Don't take this as sympathy - I more mean, I believe this is why they don't use the service.)