Energy is the currency of life; without it, we die. And yet we continue to misunderstand how our metabolism works, and therefore we develop diets, exercise programs and strategies that end up failing in our attempts to lose weight. Drawing on his fieldwork with the Hadza of Tanzania and his study of primate evolution, Herman Pontzer explains how our bodies developed a great capacity to store energy to protect against periods of scarcity and famine. This book dives into how diet and physical activity affect our weight, and how our modern sedentary, overeating lifestyles have had disastrous consequences for our health. You'll never think about food and exercise the same way again.