Research has shown that patients undergoing this surgery lose about 60 percent of their excess weight, on average. Even more weight can be lost if you carefully watch your diet and engage in a regular exercise program. As the stomach tissue is naturally stretchy, it is important that you do not overeat after your surgery. You will have lost a significant quantity of weight, very quickly, and will then "plateau." Making it through this period is one of the most critical points in maintaining weight loss. You may add more exercise to your weight loss regimen to continue to lose weight. What you consume makes a difference – it is advised that you track what you consume and avoid sugary, fatty foods as a lifestyle change.