According to the World Health Organization, people with a body mass index of 20-25 are considered normal weight. Between 25 and 30 is considered overweight. But when we go over 30, obesity begins. Between 30 and 35 is 1st degree obesity and here we still have time to lose weight by other non-surgical methods, but when we go above 35, especially if an obesity-related metabolic condition has arisen, for example an insulin resistance, hypertension, sleep apnea or hyperlipidemia If an additional discomfort has occurred, the World Health Organization, local health organizations and European health organizations also state that an operation will be more beneficial. Overweight patients with a body mass index of 35-40 are interpreted as 2nd degree obesity. Those with a body mass index over 40 are called morbid obesity. Morbid literally means deadly. In other words, it means being overweight enough to cause diseases that will cause death and trigger death. And in those over 40, the criteria for the onset of an additional disease are not sought. It is accepted by the World Health Organization that surgery would be much more beneficial for these people.