Joaquin Phoenix said he "probably shouldn't" diet for the Joker again

(NOTE LANGUAGE) Joaquin Phoenix intentionally made himself thin to the point of looking sickly for 2019′s Joker , shedding more than 50 pounds in a performance that won him a Best Actor Oscar.

But to play Arthur Fleck aka Joker in the forthcoming sequel, Joker: Folie à Deux , he had to do it all over again — something made more difficult by the film's new physical requirements, he told a panel at the Venice Film Festival, where the movie premieres Wednesday.

"I'm not going to talk through specifics of the diet, because I just think nobody wants to hear that," he said Wednesday, according to Variety .

The new movie, in which Phoenix stars opposite Lady Gaga as Harley Quinn, prominently features music and dance sequences, unlike director Todd Phillips ' blockbuster original.

The actor continued, "This time, it felt a bit more complicated just because there was so much dance rehearsal that we were doing, which I didn't have last time. So it felt a bit more difficult."

He added, "I'm now 49, I probably shouldn't do this again. This is probably it for me."

He also said that Gaga "also lost a lot of weight," noting, "It was really impressive."

For her part, the actress/recording artist demurred, saying, "I think we transformed into our characters over a period of time, and we continued to hone in every kind of detail."

For the record, Phoenix admitted to being "so angry" at himself "for making such a big deal about" the weight loss last time, because "it just sounds like an actor going on and on about how much weight they lost."

"You just do what you're f****** supposed to do," he continued. "So this time I was like, 'I'm not going to do that.'"

Joker: Folie à Deux opens Oct. 4.