Ideally, you should be at or close to your goal weight before having tummy tuck. When your abdominal skin is tightened, it will fit over your existing contours, so if you expect to gain or lose significant weight in the future, this will undo some of the positive effects of the surgery. Dr. Goggin encourages his patients to be at a steady weight for several months prior to having abdominoplasty to ensure that it is a realistic weight they can maintain.