Johann Hari, who was prescribed a new type of obesity treatment, begins to question why humans needed such a drug in the first place. He also asks what the real cause of weight gain is, whether losing weight is just a matter of will, and how we should view our own bodies. To answer these questions, he interviews over 100 life scientists who developed the drug, key figures in the food industry, and world-renowned scholars on the body, and delves into the scientific facts and social implications surrounding the birth of the new drug and the controversies that followed. In the process, he discovers the complex truths we had been missing about obesity, the body, willpower, and shame. - translation of Korean summary