From one of today’s leading experts on the emerging science of microbiome-brain communication comes a groundbreaking book that offers, for the first time, evidence that diet- and lifestyle-induced changes in the gut microbiome play a pivotal role in the health crises of the twenty-first century. "Dr. Mayer will open your eyes not only to the critical importance of the variety of microbes that inhabit your gut but also to the broader picture of how food choices that support biodiversity can save lives, shield us from novel infections, and protect the planet.”—Joel Fuhrman, MD, seven-time New York Times bestselling author “An urgent call to action for everybody concerned about the deteriorating state of our universal health.”—Yvon Chouinard, founder and owner of Patagonia, Inc.