Weight loss results will vary from patient to patient. A weight loss of two to three pounds a week in the first year after the operation is possible, but one pound a week is more likely. Twelve to eighteen months after the operation, weekly weight loss is usually less. But remember that you should lose weight gradually. Losing weight too quickly creates a health risk and can lead to a number of problems. The main goal is to have weight loss that prevents, improves, or resolves health problems connected with severe obesity.