Gregor Hasler is a professor of psychiatry and psychotherapy at the University of Freiburg. He is also the head physician at the Center for Psychiatry and, above all, the author of the bestseller "The Gut-Brain Connection" (translated title). The publication summarizes groundbreaking new findings for our mental and physical health in a popular way and makes clear why and how we do not only think with our heads, but also with our gut.