On any given day, one out of four Americans opts for a quick and cheap meal at a fast-food restaurant, without giving either its speed or its thriftiness a second thought. Fast food is so ubiquitous that it now seems as American, and harmless, as apple pie. But the industry's drive for consolidation, homogenization, and speed has radically transformed America's diet, landscape, economy, and workforce, often in insidiously destructive ways.