Question: how quickly do you lose weight after gastric bypass surgery?
Answer: At six months, you'll have lost a lot of weight. If you've had gastric bypass surgery, you will have lost about 30% to 40% of excess body weight. With gastric banding surgery, you lose 1 to 2 pounds a week -- so by six months, you'll have lost 25 to 50 pounds. Nine Months Post-Surgery.