The number of overweight people in industrialized countries is increasing relentlessly. In Germany, over half of the population is now considered overweight, affecting both women and men. The consequences include a rise in cardiovascular diseases as well as an increased risk of diabetes, Alzheimer's, and cancer. Dr. Jason Fung presents an innovative approach to the successful treatment of obesity in this book. The hormone insulin is the key to long-term and healthy weight loss and to managing energy balance. In five steps, Dr. Fung guides the reader through his proven and successful program. He explains how to change and permanently regulate insulin levels through diet. Intermittent fasting plays a particularly important role in this, as it significantly contributes to lasting weight reduction.