How did 2.3 billion people become overweight? How did heart disease, cancer, and other degenerative diseases become the leading causes of death worldwide? Our ancestors, especially our distant, Paleolithic ancestors, before the advent of agricultural, enjoyed remarkably robust health. What went wrong? During the twentieth century-the Dark Ages of nutrition-flawed nutritional theories gained widespread acceptance, prompting radical departures from traditional foods and time-honored food processing techniques. Sugar consumption skyrocketed; proinflammatory vegetable oils replaced nourishing...