About 50 surgeons in the world do the Duodenal Switch process. This procedure facilitates weight loss by limiting the amount of food that can be eaten and by restricting the volume of food that is absorbed into the body.

The stomach is limited by separating it perpendicularly and taking away over 85% of it making this part of the procedure irreversible. The part of the stomach that is left in place is shaped like a banana and measures from 4-7 ounces. The nerves to the stomach and the pylorus are left in place that allows the stomach to function probably while decreasing the volume. Compared to the Roux-en-Y gastric bypass where the stomach is divided, not removed, and the pylorus is expelled. And the Roux-en-Y gastric bypass procedure can also be reversed.