This is not a new procedure. They have been doing the switch for 25 years, but until 2007 they were doing the switch much further down the intestine. This was causing some people to have malabsorption of Vitamins even though they were receiving vitamins. So this newer version does the switch further up allowing for more absorption of vitamins. Weight loss is greater with this procedure, and most have been able to keep it off. Also, unlike gastric bypass, there is really no risk of dumping syndrome. This procedure is also recommended for patients with BMI >50, due to the greater amount of weight that needs to be lost.