Officially, Western societies are waging a war on obesity. Unofficially, we are waging a war on fat people. Anti-fat sentiment is pervasive, and fat people suffer a host of harms as a result: workforce discrimination, inferior medical care, relentless teasing, and internalized shame. A significant proportion of the population endures such harms. Yet, that is not typically regarded as a serious problem. Most of us aren’t quite sure: Is it really OK to be fat? This book argues that it is.