The One Anastomosis Gastric Bypass (OAGB), also known as “mini-gastric bypass”.OAGB is a minimally invasive procedure performed with laparoscopic technique. During an OAGB procedure, the stomach size is reduced by separating a tube-like pouch of the stomach from the rest of the stomach. This tubular gastric pouch is then connected to the intestine, bypassing up to 200cm of the upper part of the intestine. This technique differs from the traditional Roux-en-Y Bypass (RYGB) which requires two connections (anastomoses).

OAGB typically results in 30% – 40 % body weight loss. The most weight loss occurs within 6 months after surgery and then continues at a slower pace up to 18 months. This weight loss is achieved through both restriction and malabsorption. Bypassing a sizable segment of the intestine, the remaining intestine is not enough for normal nutrient absorption leading to malabsorption.