The movie Super Size Me is available for free on YouTube (official release). You just have to see it, if you haven't already.
"Super Size Me is a 2004 documentary film written, produced, directed by, and starring Morgan Spurlock, an American independent filmmaker. Spurlock's film follows a 30-day time period (February to beginning of March 2003) during which he limits himself to only eat McDonald's food. The film documents this lifestyle's drastic effects on Spurlock's physical and psychological well-being."
This is the movie trailer:
Super Size Me, from Wikipedia, the free encyclopedia.