Research has shown that patients undergoing this surgery lose about 85 percent of their excess weight, on average. Additional weight can be lost if you carefully watch your diet and engage in a regular exercise program. 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 want to 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. One of the challenges you may face is not falling back into unhealthy eating habits.