"The author of Gutbliss and one of today's preeminent gastroenterologists distills the latest research on the microbiome into a practical program for boosting overall health. Michael Pollan's widely discussed New York Times article, "Some of My Best Friends Are Germs," was just the tip of the iceberg. The microbiome--the collective name for the trillions of bacteria that live in our gut--is today's hottest medical news topic. Synthesizing the latest...