"Fat Head" is simultaneously a send-up of Morgan Spurlock's "Supersize Me" and an expose' on the state of nutrition "science". Using humor and Pythonesque cartoons, Tom Naughton does a good job of tipping many sacred cows on the topic of nutrition, showing how the government, media, and special interests combined to yield the current situation: people are eating what's supposedly "healthy", yet are developing metabolic diseases like diabetes at an alarming and increasing rate.
The core premise of the movie is to revisit "Supersize Me", where Spurlock supposedly showed the evils of fast food by eating nothing but McDonald's for a month. Spurlock gained 25 pounds, was issued a variety of dire health warnings by his doctor, etc. Naughton turns this idea on it's head: he also ate only fast food for a month, but used his "functioning brain". Rather than just blindly eating whatever was available, he avoided those foods which science has shown contribute to metabolic problems like obesity, including sodas, french fries, too much bread, etc. The result? Eating nothing but double Big Macs and the like, he lost over 12 pounds in 28 days and his cholesterol went down. The expression on his doctor's face alone is worth the price of the DVD.
"Fat Head" is very funny and discusses the science of fat gain and loss in an manner which is easily understood. My kids (8 and 4) watched it with me, and they "got it". Get a copy and share it with your friends and family.