The groundbreaking science behind the surprising source of good health Stanford University’s Justin and Erica Sonnenburg are pioneers in the most exciting and potentially transformative field in the entire realm of human health and wellness, the study of the relationship between our bodies and the trillions of organisms representing thousands of species to which our bodies play host, the microbes that we collectively call the microbiota. The microbiota interacts with our bodies in a number of powerful ways; the Sonnenburgs argue that it determines in no small part whether we’re sick or healthy, fit or obese, sunny or moody. The microbiota has always been with us, and in fact has coevolved with humans, entwining its functions with ours so deeply, the Sonnenburgs show us, humans are really composite organisms having both microbial and human parts. But now, they argue, because of changes to diet, antibiotic over-use, and over-sterilization, our gut microbiota is facing a “mass extinction event,” which is causing our bodies to go haywire, and may be behind the mysterious spike in some of our most troubling modern afflictions, from food allergies to autism, cancer to depression. It doesn’t have to be this way. The Good Gut offers a new plan for health that focuses on how to nourish your microbiota, including recipes and a menu plan. In this groundbreaking work, the Sonnenburgs show how we can keep our microbiota off the endangered species list and how we can strengthen the community that inhabits our gut and thereby improve our own health. The answer is unique for each of us, and it changes as you age. In this important and timely investigation, the Sonnenburgs look at safe alternatives to antibiotics; dietary and lifestyle choices to encourage microbial health; the management of the aging microbiota; and the nourishment of your own individual microbiome. Caring for our gut microbes may be the most important health choice we can make.