ANDREW WEIL, M.D., a graduate of Harvard College and Harvard Medical School, is Clinical Professor of Medicine at the University of Arizona and director of the Program in Integrative Medicine at that institution. He is also the founder of the Foundation for Integrative Medicine in Tucson, Arizona, and editorial director of the "Ask Dr. Weil" Web site (www.drweil.com). Dr. Weil is the author of eight books, including most recently Spontaneous Healing and Eight Weeks to Optimum Health.