Body Weight Changes Microbes (IMAGE) Arizona State University Caption The team's study is the first molecular survey of gut microbial diversity following surgical weight loss (gastric bypass), and has helped solidify the link between methane producing microbes and obesity. This means the drastic anatomical changes created by gastric bypass surgery appear to have profound effects on the microorganisms that inhabit the intestine. This change may be part of the reason that gastric-bypass surgery is the most effective means to treat obesity today. Credit Mayo Clinic Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.