Chipotle is sponsoring free screenings of the movie at the Kendall Square Cinema on July 15 and the Coolidge Corner Theatre July 16, both at 7:30 p.m. It's first come, first served, so you might want to get there early.

"Food, Inc." is an expose of the nation's food industry and the degree to which it is controlled by corporate interests. If you've read the works of Eric Schlosser and Michael Pollan, there may not be much here that's new to you, but the footage is often powerful. It's a film worth seeing -- especially when it's free. More than that, it's a film worth taking others to: friends, parents, older kids (be prepared to cook vegetarian for a while).

Scenes involving meat production are particularly chilling -- early on, we watch a factory worker dispose of baby chick after baby chick as if they're widgets rather than living creatures. It's a small taste of what's to come, and that's where the Chipotle sponsorship comes in. The chain uses only naturally raised pork and chicken in the US, and more than 50 percent naturally raised beef; according to the company, it's the largest restaurant buyer of naturally raised meat in the country. It also uses rGBH-free cheese and sour cream. The sponsorship is a good business move -- after you see "Food, Inc.," you'll be thinking hard about what you, and all of us, eat.

Here's my recent interview with "Food, Inc." director Robert Kenner.