Preservation of Fat-free Mass after Bariatric Surgery: A Comparison of Malabsorptive and Restrictive Procedures.

The Roux-en-Y gastric bypass (RYGB) has been shown to cause significant weight loss. However, fat-free mass (FFM) is often lost with this rapid weight change. It is suggested that the loss of FFM is minimized with restrictive-only procedures, such as the vertical sleeve gastrectomy (VSG), when compared with malabsorptive surgery.