Leading Harvard Medical School expert Dr. David Ludwig rewrites the rules on weight loss, diet, and health in this guide to retraining your cells and reclaiming your health--for life. Forget everything you've been taught about dieting. In Always Hungry?, renowned endocrinologist Dr. David Ludwig explains why traditional diets don't work and presents a radical new plan to help you lose weight without hunger, improve your health, and feel great. For over two decades, Dr. Ludwig has been at the forefront of research into weight control. His groundbreaking studies show that overeating doesn't make you fat; the process of getting fat makes you overeat. That's because fat cells play a key role in determining how much weight you gain or lose. Low-fat diets work against you by triggering fat cells to hoard more calories for themselves, leaving too few for the rest of the body. This 'hungry fat' sets off a dangerous chain reaction that leaves you feeling ravenous as your metabolism slows down.