Director Todd Phillips revealed Phoenix's weight loss in a recent interview with 'Los Angeles Times.'. His thinner frame was first noticed by fans in 2018, prior to filming the movie. After the 'Joker' trailers were released, fans saw just how much weight the actor had lost. Phoenix's costar, Zazie Beetz, previously told 'MTV News' how his weight loss had affected filming. We had to do everything then because Joaquin had lost so much weight that we couldn't do reshoots later on so we were figuring it out. , Zazie Beetz, to 'MTV News'. Phoenix, who understands that comic book films are often scrutinized by fans, gave the role his best shot. All I can do is approach the character the way I do and that's it. I just tried to do something that we felt was honest and unique. However you guys want to talk about it, knock yourself out, Joaquin Phoenix, to 'The Los Angeles Times'