Combined surgeries, such as Roux-en-Y gastric bypass, long limb Roux-en-Y gastric bypass, and biliopancreatic diversion with duodenal switch "combine" malabsorptive and restrictive methods.  The procedure restricts how much the stomach can hold while reducing how much the intestine can absorb.  The combination of these two methods has proven to be a great formula for long term weight loss.