In Fed Up, Daniel Lieberman tackles this confusion head on with his trademark blend of lively storytelling and myth-busting science. Drawing on evolutionary biology, anthropology and physiology, he explains how humans first evolved to eat; how fire, farming and industrialization transformed our diets; and what that history combined with rigorous medical science can - and cannot - tell us about what to eat today to stay healthy and manage our weight. In each chapter, Lieberman explores what different diets - from Paleo to veganism to intermittent fasting - tell us about nutrition and health, even putting these diets to the test himself. His conclusion is liberating: there is no optimal diet. What matters instead is variety, moderation and finding out what works for you.