"I'd run six-and-a-half miles in the morning and six-and-a-half miles at night and I'd eat just chicken breast, egg whites, one baked potato a day, no butter, no salt and a lot of coffee, a lot of cigarettes... It was really stupid." Matt Damon on how he lost 40 pounds (18.14 kilograms) in three months to play a heroin addict in 1996 movie Courage Under Fire.