July 1, 2015 • Everyday we learn more about how the gut microbiome may influence health. Our gut microbial community—a super-organism, with trillions of members—has been associated with obesity, diabetes, cancer, heart disease, and immune disorders, and even moods. These findings have generated enormous enthusiasm among researchers and the lay public, as they suggest a largely untapped area for health-promoting interventions. One mechanism through which the gut microbiome may affect health is through the metabolism of food and nutrients.