JAMES F. BALCH, M.D., is one of the bestselling health book authors of all time with his coauthored landmark Prescription for Nutritional Healing, which was one of the first major books to show how food and supplements can improve health. He has made numerous appearances on TV and radio and regularly lectures around North America. Dr. Balch writes a monthly newsletter, Prescriptions for Healthy Living, which is read by 50,000 subscribers; he also has a weekly Internet radio program called Prescriptions for Healthy Living on wsradio.com.MARK STENGLER, N.D., is a licensed naturopathic doctor, author, and lecturer with expertise in nutrition, herbal therapy, vitamin therapy, homeopathy, and integrative medicine. He serves on a medical advisory committee for the Yale University Complementary Medicine Outcomes Research Project. An associate clinical professor at the National College of Naturopathic Medicine, Dr. Stengler is in private practice in La Jolla, California.Mark Stengler is the author of 'Prescription for Natural Cures: A Self-Care Guide for Treating Health Problems with Natural Remedies Including Diet and Nutrition, Nutritional Supplements, Bodywork, and More', published 2005 under ISBN 9780471775645 and ISBN 0471775649.