JAMES M. RIPPE, M.D., is Associate Professor of Medicine at the Tufts University School of Medicine in Boston. He is the Founder and Director of the Rippe Lifestyle Institute in Shrewsbury, Mass., one of the largest nutrition, exercise, and lifestyle medicine research organizations in the United States. He has written or edited more than 25 books, ranging from Heart Disease For Dummies® to the world's leading textbook on intensive care medicine. His work has been featured on the Today show, CNN, and the CBS Evening News, as well as in the New York Times and the Wall Street Journal.

KAREN MILLER-KOVACH is Chief Scientific Officer of Weight Watchers International, Inc. With its mission of helping people reach and maintain a healthy weight through a comprehensive weight- management program that is based on the latest science, Weight Watchers meetings provide the coaching and tools to help people make positive changes for lasting weight loss.