First, it depends on a calculation known as the body mass index, or BMI. To be eligible for bariatric surgery, you must have a BMI greater than 40, which generally equates to being 100 pounds or more overweight if you're male, and 80 pounds or more overweight if you're female.
You may also be eligible for bariatric surgery if your BMI is between 35 and 40 and you have significant comorbid conditions such as Type 2 Diabetes or hypertension.
Whatever you're BMI, there's another condition you must meet to be eligible for bariatric surgery: You must have tried other medically managed weight loss methods. Other methods are very good and many people achieve success with them. But those methods aren't the right solution for everyone, and if they haven't worked for you—in spite of your best efforts—bariatric surgery may be your best chance to lose weight, improve your health, and create a new start for yourself.