It is also an effective procedure for resolution of diabetes, sleep apnea and control of hypertension. In this, a small gastric pouch of 15-20ml is created, which leads to reduction of food intake. The intestinal architecture is then changed so that a large portion (175-250cm) of small intestine is bypassed, before the digestion and absorption of food starts. This results in malabsorption of food, and subsequent drastic weight loss. In the end, the integrity of pouch is checked using per-operative gastroscopy. A small abdominal drain is usually left which is taken out after 48-96 hours.