Synthesizing the latest findings, Dr. Robynne Chutkan explains how the standard Western diet and lifestyle are starving our microbiome, depleting the "good bugs" that keep us healthy and encouraging overgrowth of exactly the wrong type of bacteria. The resulting imbalance makes us more prone to disease and obesity and negatively affects our metabolism, our hormones, our cravings, our immunity, and even our genes. But beyond the science, what sets this book apart is Dr. Chutkan's powerful three-level program for optimizing your gut bacteria for good health. Dr. Chutkan shares: Why hand-sanitizing gels and antibiotics are stripping our bodies of their natural protective systems Essential prebiotics and probiotics Recipes with ingredients that replenish the microbiome for each rehab level Cutting-edge research on the connection between the microbiome and the brain An intro to the stool transplant, the superfix for a severely troubled microbiome. This is the first book to distill the research into a practical, effective plan for replenishing our microbiomes.