Matt Damon describes the extra 30 Lbs he had to gain for the making of the movie The Informanti as very very easy and fun.

In the film, set to debut in North America tomorrow, Damon acts an agricultural company's vice president-turned-FBI informant.

It was very, very easy to gain the weight, Damon told reporters at the Venice Film Festival on Monday. It was very, very fun, probably the funnest time I had working because I didn't have to go to the gym after work and I just ate everything I could see.