Usually, the gut isn't well-liked, but the author points out that it is a super organ often neglected due to its “geographical location.” It is both proud and temperamental; it can both sustain and take lives; it can boost the brain's capacity and productivity but also make people manic-depressive. It is no exaggeration to say that a slight movement in the gut may affect the whole body. The book we’ll discuss today was the best-selling book in Germany in 2014 and was named the New York Times bestseller of 2015.