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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.
Gastric Bypass. Initial weight loss with the gastric bypass is approximately 3 lbs. to 5 lbs. per week for the first 3 to 6 months. Over 18 months, a gastric bypass can result in the loss of about 65 percent to 75 percent of excess weight.astric Bypass. Initial weight loss with the gastric bypass is approximately 3 lbs. to 5 lbs. per week for the first 3 to 6 months. Over 18 months, a gastric bypass can result in the loss of about 65 percent to 75 percent of excess weight.