If you have a body mass index (BMI) of 40 or more -- which is about 100 pounds overweight for men and about 80 pounds for women -- you are considered severely obese and therefore a candidate for weight loss surgery.
Obesity surgery may also be an option for people with a BMI between 35 and 40 who suffer from obesity-related problems (for example, severe sleep apnea, obesity-related heart disease, or diabetes). For these people, the risk of death from not having the surgery may be greater than the risks from the possible complications from undergoing the procedures.