A revealing look at the 300 trillion microorganisms that keep us healthy-and the foods they need to thrive These days, probiotic yogurt and other "gut-friendly" foods line supermarket shelves. But what's the best way to feed our all-important microbiome-and what is a microbiome, anyway? In this engaging and eye-opening book, science journalist Katherine Harmon Courage investigates these questions, presenting a deep dive into the ancient food traditions and the latest research for maintaining a healthy gut. Courage's insights include: Meet your microbiome: What it is, how it works, and why it's essential for our immune system--and overall health Gut-friendly food traditions: A guided tour of artisanal makers of yogurt, kimchi, kefir, kombucha, olives, cocoa, and other vibrant, ancient foods from around the world that feed our microbiome (along with simple recipes for curious at-home cooks) Cutting-edge science: A first-hand look at some of the top lab facilities where microbiolo