In this authoritative, easy - to - read book, Glenn Gaesser, an exercise physiologist, challenges the conventional wisdom that excess body fat poses a danger to health. He explains that it is the fat in your diet - not your weight - that is harmful, and presents scientific evidence of the benefits of body fat. In addition, Gaesser presents a ''20/20 program'' for achieving optimal health and metabolic fitness through 20 minutes of daily moderate exercise and a complex - carbohydrate eating plan. This edition includes a new introduction and updated research. ''Challenges the common beliefs that 'thin is best' and 'weight loss improves health.' '' - Pat Lyons, author of Great Shape