In general, gastric bypass and other weight-loss surgeries may be an option for you if: A body mass index (BMI) is 40 or higher. Your BMI is between 35 and 39.9, and you have serious weight-related health problems, such as  Type 2 diabetes High blood pressure Severe sleep apnea.  In some cases, you may qualify for certain types of weight-loss surgery if your BMI is 30 to 34 and you have serious weight-related health problems.