What happens if you gain back weight after gastric bypass surgery?

Answers from Katherine Zeratsky, R.D., L.D.

If you begin to regain weight after gastric bypass surgery, talk to your doctor. You may need a thorough evaluation to determine what factors — medical, psychological, lifestyle — could be involved in the weight gain.

You may have gained weight after gastric bypass surgery because of unexpected but natural changes in your stomach and intestine that allow you to eat more and absorb more calories. But it's also possible that your diet and exercise habits have slipped, in which case you must typically lose the regained weight the old-fashioned way — both by reducing your calorie intake and increasing your physical activity.

In some cases, a second surgery to repair — or redo — a gastric bypass may be appropriate. However, a second surgery has an increased risk of complications, including infection, bleeding and leaks in the gastrointestinal tract. Because of these risks, gastric bypass surgery usually isn't redone if you regain weight because of poor diet or exercise habits.

Gastric bypass surgery can be an effective treatment for obesity, and most people do lose weight after the procedure. But you'll always be at risk of regaining weight, even years later. To help reach your weight-loss goal and prevent weight regain, it's crucial to make lifestyle changes along with having gastric bypass surgery.

Jun. 16, 2012