In a recent interview with The Associated Press, Joaquin Phoenix opened up about his preparation for ‘Joker’ and the toll it took on his body. . The 44-year-old actor was reportedly urged by the movie's director, Todd Phillips, to lose 52 pounds for his role. Although he lost the weight safely under a doctor’s guidance, the drastic process caused him to develop an eating “disorder.”. Once you reach the target weight, everything changes … Like so much of what’s difficult is waking up every day and being obsessed over like 0.3 pounds. Right? And you really develop like a disorder. I mean, it’s wild, Joaquin Phoenix, to The Associated Press. Phoenix previously spoke about the effects of his weight loss in August, saying the process negatively impacted his mental health. As it turns out, [weight loss] impacts your psychology, and you really start to go mad when you lose that much weight in that amount of time, Joaquin Phoenix, via 'People'