Adults with obesity experienced substantial reductions in fat mass, total body weight and total lean mass a year after undergoing Roux-en-Y gastric bypass surgery, as well as a 32% increase in relative muscle strength, but a 9% decline in mean absolute grip strength, according to a study published in The Journal of Clinical Endocrinology & Metabolism. Researchers examined 47 adults with a mean age of 45 and found that the RYGB procedure also led to statistically and clinically significant improvements in physical performance measures, including gait speed and walk time.