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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.
1. Gastric Band Surgery Positives. Weight loss is usually better than gastric balloon or vBloc Therapy (but less than gastric sleeve, gastric bypass, or duodenal switch). However, weight loss after gastric band surgery is highly variable. It ranges from 20% (similar to gastric balloon and vBloc) to 80% (similar to duodenal switch).