My apologies in advance if my reply does not fit in with the current path of discussion on this thread, but I have a comment to make and I'm at work so I don't have time to read (but I will later!).
My mom had lap-band surgery about 6 years ago and she has had nothing but problems. She still throws up and has lost almost all of the enamel on her teeth, has been "conditioned" not to eat certain foods (so she eats a very poor diet) because she did not have health eating habits to begin with , and, in my opinion, is generally more depressed than she normally is since the surgery. She lost about 90 pounds, but has gained most of it back. No, she not only has the original shame of being over weight, but blames herself for the surgery failing and gaining the weight back.
I wish she'd never gotten it because it has probably taken years off her life.