In the past decade, obesity has emerged as a major public health concern in the United States  and abroad. At the federal, state, and local level, policy makers have begun drafting a range of policies to fight a war against fat, including body-mass index (BMI) report cards, ";snack taxes,"; and laws to control how fast food companies market to children. As an epidemic, obesity threatens to weaken the health, economy, and might of the most powerful nation in the world.            In Killer Fat, Natalie Boero examines how and why obesity emerged as a major public health concern and national obsession in recent years. Using primary sources and in-depth interviews, Boero enters the world of bariatric surgeries, Weight Watchers, and Overeaters Anonymous to show how common expectations