Gastric sleeve is a highly effective bariatric surgery, but it’s not a cure for weight problems; it’s a tool to help you manage your size and health. Whether your weight loss is permanent is largely up to you. Research shows that patients followed for over five years after their gastric sleeve surgery achieved sustainable weight loss. However, it is possible to regain some or most of the weight if you return to your old eating habits. Eating small portions and physical activity are the best ways to maintain a lower weight.