London: Actor Matt Damon says he was always grumpy on the set of "Elysium" because he was on a strict diet to stay in shape.
The 42-year-old actor underwent a tough fitness regime and said giving up treats left him angry and unapproachable.
"I was grumpy on this set, because I was on a diet for the whole movie. I think I shut up a little bit and keep to myself.
"It`s not even that it was as extreme as diets I`ve done before, but it`s like, at my age, I want to eat everything in my path, you know what I mean? I think I`ve become more of a glutton. It was really hard because I love to eat and I love to drink," he said.
Damon, who raises four daughters Alexia, 14 , Isabella, six, Gia, four and Stella, two, said his wife does not mind when he changes shape for movies because she likes the variety.
"I`m at the point in my life where somebody was silly enough to marry me and won`t leave me if I put on a few pounds. I think my wife likes the variety. When I did `The Informant`, I put on 40 pounds. I was like, `You like this guy, too, don`t you?` I`m trying to talk her into that guy. That`s the guy I`m most comfortable being."