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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.
Average Weight Loss With Gastric Sleeve Surgery Before we make any calculations, letâs look at the average weight loss from gastric sleeve surgery. Because different people have different heights and weights and therefore different body mass indexâs, we cannot use pounds alone to measure expected weight loss.