Severe obesity does not respond to diets or drugs. These treatments can be used in mild-moderate levels of obesity, but they are not effective in morbid obesity cases, because they won’t achieve over 10% weight loss at 5 years (and the minimum goal is 50%).
In severe obesity, the only effective treatment at long-term is surgery, which is the only one to achieve an adequate weight loss, which will also be sustained over the years.
Not all surgical treatments offer the same results or have the same consequences. There are three types of interventions: