By Madeline Kennedy (Reuters Health) – Many people worry about regaining weight after getting gastric bypass surgery, a weight-loss procedure for very obese patients, but a new study suggests that most patients remain lighter 10 years later. Looking at patients four years and 10 years after weight-loss surgery, and comparing them to obese peers who didn’t have surgery, researchers found that most surgery patients lost significant amounts of body weight and kept it off. People undergoing Roux-en-Y gastric bypass (RYGB) had the best weight loss results, losing 21 percent more than people who didn’t have surgery, and 10 percent to 17 percent more than those who had weight-loss procedures known as sleeve gastrectomy and gastric banding.