For thirty days, Morgan Spurlock ate nothing but McDonald's as part of an investigation into the effects of fast food on American health. The resulting documentary earned him an Academy Award nomination and broke box-office records worldwide.

But there's more to the story, and in Don't Eat This Book, Spurlock examines everything from school lunch programs and the marketing of fast food to the decline of physical education. He looks at why fast food is so tasty, cheap, and ultimately seductive--and interviews experts from surgeons general and kids to marketing gurus and lawmakers,...