The book "Why We Get Fat" by Gary Taubes challenges conventional wisdom about weight gain. It argues that the widely accepted 'calories in, calories out' model is flawed. Taubes, an investigative science journalist, presents compelling evidence that carbohydrates, particularly refined sugars and starches, are the primary drivers of fat storage and obesity, not simply overeating or lack of exercise. He delves into the hormonal mechanisms that regulate fat cells, providing a detailed scientific explanation of how diet impacts our body's metabolism and weight. This book offers a radical new perspective on diet and health, encouraging readers to rethink their approach to food and weight management.