This is the most commonly employed Gastric Bypass technique, the small intestine is divided approximately 45 centimetres below the lower stomach and is rearranged in a Y configuration, enabling outflow of food from the small upper stomach pouch. The Y intersection is formed near the upper end of the small intestine. The Roux limb is constructed using 100 to 150 cm of the small intestine, preserving the rest of it for absorbing nutrients. The patient will experience very rapid onset of the stomach feeling full, followed by a growing satiety or indifference to food. Most patients experience about 70% excess weight loss after the Gastric Bypass. It has been shown to be the gold standard bariatric procedure which other procedures are commonly compared with.