Changing habits. If you're considering weight loss surgery, know this: Surgery is not a cure for obesity. In fact, many people do regain weight despite their surgery. They may start eating in ways that evade the restriction on their stomach size. The body itself can learn to adapt to surgeries that interfere with the absorption of food; so, over time, your digestive tract might begin to take in more calories again. The size of a surgically reduced stomach can gradually expand. So remember: weight loss surgery won't solve your problem. To keep off weight, you need to work at it.