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Weight loss happens fast after gastric sleeve surgery: 1  Month 3: About 1/3 of excess weight is gone. 2  Month 6: About half of excess weight is gone.  Month 12: Up to 70% of excess weight is gone.
With gastric bypass, patients generally lose 60 to 75 percent of their excess weight within the first 6 to 9 months after surgery. After that, weight loss continues until about 18 months post-surgery when the patient usually achieves his/her goal weight. With lap band, the rate of weight loss can be much slower.