I'm coming to this really late, but I'll throw in my $0.02 anyway.
I think that in almost every case, getting bariatric surgery is a mistake that's, over time (usually far less time than the people who've opted for it could have imagined) doomed to failure.
Most fat people aren't that way because they overeat. Let me clarify; I'm not saying that some fat people don't overeat, but that that isn't the reason for their fat in most cases. After all, plenty of thin people over overeat all the time. The difference between the thin overeater and the fat one is not what they're eating, but the way they're processing it.
Thin overeaters are less efficient at energy (calorie) storage than fat overeaters.
Outside of being extremely diligent about diet and exercise every day of their lives, the key to people who are prone to fatness becoming and maintaining thinness isn't food restriction via surgery, but discovering a way to cause a fat person's body to process food like a thin person's body.
Bariatric surgery flat out doesn't do that; as of yet, nothing does.
It simply doesn't matter how little food you take in after you've been cut, the way the calories are processed will still remain the same as they do with anyone prone to fatness.
This is why practically everyone who gets that surgery ends up regaining most or all of their weight over a long enough time line.
I have a billion other reasons why I think bariatric surgery is unwise, but I'll stop here.
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