TRICIA CUNNINGHAM devised the Reverse Diet, lost over 150 pounds on the plan, and has maintained her weight loss for more than six years. A successful motivational speaker, she has appeared on "Good Morning America" and in numerous national magazines. Her popular Web site is www.reversedietsolution.com.

HEIDI SKOLNIK, MS, CDN, FACSM, runs a private nutrition practice and is the nutritionist for the New York Giants and the American School of Ballet. She is the weight-loss columnist for "Men's Health" magazine and appears frequently on national television programs, including CNN's "American Morning," "Good Morning America," and many others.