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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 Sleeve Weight Loss Timeline, Chart â Excess Weight Loss After 3, 6, 12, & 18 Months. Gastric sleeve surgery is a two-step process that is used to help patients lose a large amount of excess weight in a short period (sometimes as less as just 18 months). Typically, expected weight loss for patients can be expected to reach about 60% to 72% of their excess weight in a year.