Morgan Spurlock, the man famous for living on McDonald’s for a month, will speak at NIU on Tuesday about why Americans are so fat.

Spurlock’s speech, scheduled for 7 p.m. at the Holmes Student Center’s Carl Sandburg Auditorium, will be centered around his movie, “Super Size Me,” that chronicles America’s obsession with fast food. Admission is free.

Spurlock spent a month surviving only on McDonald’s food, with the following stipulations: He could only eat what was available over the counter (including water), no supersizing unless it was offered and he had to eat every item on the menu at least once.

In his movie, Spurlock also interviewed people in 20 U.S. cities, asking their opinions on the country’s obesity problem and their need for the fast food fix.

During his presentation, he will spend the first 20 minutes explaining what he did, why he did it and the process he went through, said Tiffany Gonzales, CAB speakers coordinator. Afterward, Spurlock will show his movie, and following the movie will be a question-and-answer session with the audience.

“This is cool because how often do you get the chance to watch a movie and then ask the director and the star of the movie questions?” Gonzales said.

CAB speakers decided that based on surveys conducted at the end of last year, Spurlock was the speaker students wanted to hear.

“Students want people who are independent, not big names,” Gonzales said.