Euclid Market, a corner store in East Los Angeles, recently got a makeover to promote healthier eating. It not only sells more fruits and vegetables, but also offers cooking classes and nutrition education. Courtesy of Margaret Molloy/UCLA Fielding School of Public Health hide caption

itoggle caption Courtesy of Margaret Molloy/UCLA Fielding School of Public Health

Bacteroides species are some of the most common bacteria in the human gut. Enviornmental Health Perspectives hide caption

itoggle caption Enviornmental Health Perspectives