I am going to fall-back to my addiction analogy (sorry San)

... because I really believe it has some relevance.
I hear all the time from people that attend 12-step programs, "It's a simple program for non-simple people"... and that is the truth about many things that work.
Addicts can't just quit on their own about 95% of the time, they really do need help. And this help comes in the form of guidance, advice, tricks, counseling... it comes from many things. Same thing with overweight people. Many are caught in the cycle of obese --> weight loss --->obese, just like drug addiction, a cycle.
Again, addicts know they need to simply stop, just give it up, but most cannot. Once they join this 12-step system, many start to realize it's not as hard as it seems. However, this realization didn't come from introspection, it came from a book written by Bill W, co-founder of AA. He gave people a mechanized system, with some wiggle room and suddenly addicts everywhere were seeing the light, and getting clean.
Now, I personally don't really like the 12-step system, but it's really hard to argue with achievement. I don't go around bad-mouthing the 12 steps, because lives have been changed by a book that someone wrote.
Like addiction, Obesity is prevalent throughout the world, and anything, literally
anything that helps someone overcome the burden of being overweight should be celebrated, and dissected to determine what makes it work. Just because we don't like something, doesn't mean that the object of our dislike is a bad thing.