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LIZ VACCARIELLO is the vice president and editor-in-chief of Prevention, the #1 healthy lifestyle brand and the tenth largest magazine in the nation, with nearly 11 million readers. She resides in New Jersey. CYNTHIA SASS, MPH, RD, is Prevention's nutrition director. With master's degrees in nutrition science and public health, Sass has more than 10 years of experience in helping women lose weight. She lives in New York City.