Two recent research studies contribute to the growing body of evidence that the population of microbes residing in our intestines plays vital roles in our health. One is a meta-analysis of studies done to determine if taking probiotics alongside antibiotics can alleviate antibiotic associated diarrhea; results are reported in the Journal of the American Medical Association [1]. The other evaluated the effects of red wine on the different species of bacteria in the gut; it appears in the American Journal of Clinical Nutrition [2].