Morgan Spurlock subjects himself to a diet based only on McDonald's fast food three times a day for thirty days without exercising to try to prove why so many Americans are fat or obese. He submits himself to a complete check-up by three doctors, comparing his weight along the way, resulting in a scary conclusion.

Cast: Morgan Spurlock, Daryl Isaacs, Lisa Ganjhu, Stephen Siegel, Bridget Bennett, Eric Rowley