Chronic diseases are the most costly and deadly health problems but also the most preventable. That's what's so maddening to Berkeley-based functional medicine practitioner Chris Kresser, who runs a popular website, podcast, and health clinic and has authored two books on the functional medicine approach and Paleo nutrition. Inspired by his own past health challenges, Kresser tackles health problems by trying to understand the underlying causes of illness rather than treating symptoms, which is his biggest criticism of conventional medicine. People who've struggled with symptoms that Western doctors don't have answers for have found their way to Kresser's clinic, the California Center for Functional Medicine. But the comprehensive testing doesn't come cheap. That led Kresser to launch a health coach training program in order to make functional medicine more accessible and affordable, and he even created a pilot program to help new recruits in the Berkeley Fire Department adopt healthier lifestyles. Keeping up on the latest scientific research, Kresser is on a mission to get us healthier. All we have to do is pay attention.