Harley Pasternak, M.Sc., is the New York Times bestselling author of The Body Reset Diet, 5 Pounds, The 5-Factor Diet, 5-Factor Fitness, and The 5-Factor World Diet. He holds a master of science degree in exercise physiology and nutritional sciences from the University of Western Ontario, and is certified by the American College of Sports Medicine and the Canadian Society of Exercise Physiology. He lives in Los Angeles.