Matt Damon kept telling Josh Harnett he'd regret gaining 30 pounds for 'Oppenheimer:' 'You're never gonna get that off again'
Years later, he gained 30 pounds for the 2009 satire "The Informant!" He's also done intense training for the Jason Bourne movies, following a 2,000-calorie-a-day ...
INSIDER via Yahoo
12 hours ago