How are obesity and morbid obesity defined?
Body mass index (BMI) is a measure of body fat based on height and weight. Obesity is defined as a BMI of greater than or equal to 30 kilos per meter squared. Morbid obesity is defined as a BMI greater than or equal to 40 kilos per meter squared. Among Americans 20 years and older, 28% are obese and 5% are morbidly obese.