Book excerpt: For fifty years, the medical establishment has preached the same rules for losing weight: restrict calories, eat less, and exercise more. Yet in that time, obesity in the United States has skyrocketed. So why has this prescription so clearly failed? Based on twenty years of investigative reporting and interviews with more than a hundred practicing physicians who embrace ketogenic (low-carbohydrate, high-fat) eating as the best formula for health, here bestselling author Gary Taubes puts the keto movement in the necessary historical and scientific perspective. He makes clear the vital misconceptions about obesity and diet (no, people do not become fat simply by eating too much or being sedentary; hormones play the critical role) and uses collected clinical experience from the medical community to provide much-needed practical advice on healthy eating. A groundbreaking manifesto for the fight against obesity and diabetes, in The Case for Keto, Taubes reveals why the established rules about eating healthfully might be the wrong approach to weight loss for most people, and how ketogenic diets can help many of us achieve and maintain a healthy weight for life.