A portion of the stomach is removed and a tube-shaped stomach is left in this method. After the operation, patients feel full with small amounts of food and being full turns into loss of appetite over time. In addition, as the part of the stomach that secretes hunger hormone is removed, patients does not feel hunger. This is a very simple method and its complication rates are very low. Approximately 60-70% of the excess weight is expected to be lost within a few years following the operation.

If the patient gains weight in the long term after the operation, suitable gastric bypass surgical methods can be applied as well. Sleeve gastrectomy can be the first method to use in patients with very high BMI in order to avoid unwanted complications of gastric bypass operations. As this surgery only limits the amount of food consumption, no external vitamin or mineral supplement is required.