Why do some people regain weight after bariatric surgery?Bariatric surgery is a lifesaving surgery for those suffering from life-threatening conditions due to obesity. There are 2 ways Bariatric surgery achieves weight loss, i.e. by reducing calories consumed or minimizing the absorption of calories or both (depending on the type of surgery). The former is known as restrictive surgeries, where the stomach size is reduced. The latter are malabsorption surgeries, which force lower calorie absorption..bariatricsurgeonindia.com/why-do-some-people-regain-weight-after-bariatric-surgery/-Dr Venugopal Pareek, Bariatric Surgeon