Christian Bale underwent a dramatic physical transformation ahead of filming, dropping roughly 70 pounds in about seven months. For his role in Vice, Bale had bulked up to around 228 pounds, but to play a lean race car driver, he returned to a much lighter, racing-ready physique. When co-star Matt Damon asked how he achieved such rapid weight loss, Bale said he simply didn’t eat, a level of discipline Damon described as monk-like.