A person who is classified as morbidly obese has a BMI (Body Max Index) greater than 40, or he or she is more than 100 pounds overweight. In addition, people with a BMI of 35 or higher with an existing medical condition such as hypertension or diabetes are also considered morbidly obese. If someone is sufficiently overweight enough where it interferes with normal functioning or health, he or she is classified as morbidly obese.