Author of the best-selling Nancy Clarks Sports Nutrition Guidebook, Nancy Clark, MS, RD, based in the Boston area, has been referred to as one of Americas leading sports nutritionists. Clarks private practice is at Healthworks Fitness Center in Chestnut Hill, MA, where she counsels both casual exercisers and competitive athletes. As a registered dietitian with additional training in exercise physiology, Clark is board certified as a specialist in sports dietetics. She is a Fellow of both the American Dietetic Association and the American College of Sports Medicine.