MARK A. MOYAD, MD, MPH, is the Jenkins/Pokemper director of complementary and alternative medicine at the University of Michigan Medical Center. He is the primary author of more than 130 medical journal articles on the subjects of lifestyle changes and supplements (more than any other expert) and has given more than 5,000 medical lectures to consumers and health care professionals. He lives in Ann Arbor, Michigan.

JANET LEE, LAc, has been writing about fitness, health, and nutrition for the last 20 years. She is also a licensed acupuncturist with a private practice in Los Angeles.