This book delves into the science behind obesity and weight gain, challenging the conventional wisdom that blames overeating and lack of exercise as the primary culprits. The author, an acclaimed science writer, argues that the problem lies in our carbohydrate consumption, particularly refined grains and sugars. Drawing on extensive research, he explains how these foods trigger insulin production, leading to fat storage in our bodies. The book also criticizes the calorie-in/calorie-out model of weight management, asserting that it oversimplifies the complex biological processes involved in weight regulation. Instead, it proposes a hormonal-regulatory view of obesity, suggesting that understanding and controlling our hormones is the key to managing our weight. The book is a thought-provoking exploration of the science of nutrition, offering a fresh perspective on the obesity epidemic and potential solutions for those struggling with weight issues.