The 2004 documentary by Morgan Spurlock that follows 30 days of eating only McDonald’s food is Super Size Me.
Spurlock conducted the experiment in 2003, eating three McDonald’s meals a day and agreeing to accept a supersized meal whenever staff offered one. He also tried to limit his walking to roughly the average American’s activity level. The film tracks his physical and psychological changes through medical checkups.
By the end of the month, Spurlock reported gaining about 24.5 pounds, with elevated cholesterol, mood changes, and liver problems. The experiment became a highly visible criticism of fast-food culture and portion sizes, although reviewers and later commentators questioned the film’s scientific controls and his failure to publish a complete food log.
Super Size Me premiered at the 2004 Sundance Film Festival, where Spurlock won the directing award for documentaries. It was later nominated for the Academy Award for Best Documentary Feature. A common mix-up is confusing it with Fat Head, a later documentary that challenged some of Spurlock’s conclusions.