Giulia Enders is an MD working at the Israelite Hospital (Israelitisches Krankenhaus, IK) and author of the bestseller ‘Gut: The Inside Story of Our Body’s Most Underrated Organ’. Enders explains how and why she became fascinated by the functions and the importance of the human gastrointestinal tract, including the gut microbiota, in this talk held in TEDxDanubia, Budapest (Hungary), in May 2017.