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A clear definition of morbid obesity is very important because this definition is used to guide doctors in the selection of treatment options for people who are overweight. Individuals are usually considered morbidly obese if their weight is more than 80 to 100 pounds above their ideal body weight.
A more widely accepted and more exact way to define morbid obesity is with the body mass index (BMI). The BMI is calculated as follows:
BMI = weight (kg)/height (m2)
A BMI above 40 indicates that a person is morbidly obese and therefore a candidate for bariatric surgery. Bariatric surgery may also be an option for people with a BMI between 35 and 40 who suffer from life-threatening cardiopulmonary problems, diabetes, or other medical problems listed below. However, as in other treatments for obesity, successful results can be affected by motivation and behavior.
People who are obese have higher rates of medical problems. The chance of problems such as heart disease, high blood pressure, diabetes, and premature death increases dramatically as weight increases. Morbidly obese men between the ages of 25 and 35 have a 12-fold greater risk of dying prematurely compared to people of the same age who are of normal weight.