 I am Dr. Sumit Alwath. I am the chairman of bariatric surgery at Manipal Hospital Bangalore. That's a very good question. Weight gain after bariatric surgery. Once you have lost the weight, reached a plateau and then you start gaining weight is a problem which is very, very relevant. It's not very common but definitely there are some people who will gain weight after losing weight from bariatric surgery. The causes are twofold. One of the causes is that there is a mechanical problem in the operation. Either the sleeve has dilated or the bypass has dilated. If that is the case, then a repeat surgery may be required. Most of the times, however, the cause is the imbalance in the diet. Again, you have to be careful about the composition of your diet. Low on carbohydrates is very important in maintaining the weight loss and to prevent weight gain after bariatric surgery.