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I’m sure some people have, but of the half dozen people I know to have gotten a gastric bypass, all of them were about where they started no more than 5 years later.

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Are you sure they got gastric bypass and not lap band? All the people I know that got the bypass has lost significant quantities of weight. The bypass surgery essentially greatly reduces/removes the stomach from the digestion equation and greatly reduces the efficiency of digestion. The lap band is a rubber band around the stomach which makes it harder to consume large quantities of food, but has a higher chance of being ineffective.

I’m overweight myself but it’s not medication related. I’ve been using behavior modification using cbt paired with diet and exercise. The cbt was a recent addition since I’ve regressed several times with just diet and exercise alone.

Weight gain does often happen a few years post treatment. Even then it's beneficial compared to no intervention, which would most likely have them be even worse off five years later. Long term health outcomes are better for those who get treatment than those who don't.

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