Spurlock's film follows a 30-day experiment during which he subsists entirely on food and items purchased from McDonald's. Documented are the effects on Spurlock's physical and psychological well-being. The film also explores the fast food industry's corporate influence -- including how it encourages poor nutrition for its own profit.

During the filming, Spurlock dined at McDonald's restaurants three times per day, sampling every item on the chain's menu at least once. He consumed an average of 5,000 calories (the equivalent of 9.26 Big Macs) per day during the experiment.
http://en.wikipedia.org/wiki/Super_Size_Me