What is the origin of our gut microbiota? How is it formed in newborns? How is it affected by breastfeeding? How does it evolve throughout our lifetime? You must have asked yourself these questions more than once… Well, during the 4th Gut Microbiota for Health World Summit 2015, we had the opportunity to interview Professor Brent Polk, Chair of the Pediatrics Department at Children’s Hospital Los Angeles, who answered our questions and revealed some more secrets about our much-loved gut bacteria.