At the global forum in Davos, Arianna spoke with Mark Hyman, MD, about the U.S. epidemic of chronic disease and what inspired him to develop "functional medicine."
Hyman, who is a medical editor at The Huffington Post, explained his thinking around how to define illness changed when he developed chronic fatigue syndrome. "I began to realize our paradigm of medicine is wrong," he said. "There is a fundamental flaw in how we think about disease."
Watch the whole video above.