Weight regain after bariatric surgery can have devastating psychological effects. How Sustainable Is the Weight Loss After Bariatric Surgery? I explore that issue in my video of the same name. Most gastric bypass patients end up regaining some of the fat they lose by the third year after surgery, but after seven years, 75% of patients followed at 10 U.S. hospitals maintained at least a 20% weight loss. The typical trajectory for someone who starts out obese at 285 pounds, for example, would be to drop to an overweight 178 pounds two years after bariatric surgery, but then regain weight up to a...

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