Microbial Diversity in the Human Gut (IMAGE) Arizona State University Caption The four images indicate the degree of microbial diversity in the gut in normal patients as well as in obese patients before and after undergoing two types of weight-loss surgery. The normal human gut has a high degree of microbial diversity, considered important for the maintenance of health. Obese patients have lost much of this diversity and while laparascopic band surgery effectively leads to weight loss, the low microbial diversity condition remains. By contrast, gastric bypass surgery results in the restoration of microbial diversity in the gut, though the composition of microbes is distinct from both normal weight and obese patients. Credit Graphic by Jason Drees for the Biodesign Institute 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.