Inside Orlando Bloom's dramatic transformation for 'The Cut'

Orlando Bloom, 47, underwent a drastic transformation for his role in the upcoming drama The Cut.

He lost 52 pounds in just three months to play a retired boxer who goes to extreme lengths to lose weight.

Bloom spoke about the challenging experience during an appearance at Variety magazine's Toronto Film Festival Studio. He revealed that he tiered down his food intake over a three-month period to reach his lightest weight just before filming.

"I basically tiered down the food over three months until just before filming, (when) I was at my lightest. I dropped 52 pounds, and I was about 185 when I started," Bloom said.

"So I dropped quite a lot of weight, and I was very mentally challenged as well. You feed somebody tuna and cucumber long enough…"

Bloom, who appeared alongside director Sean Ellis and co-stars John Turturro and Caitríona Balfe, was fascinated by the changes he experienced while losing weight.

"I was more surprised about the mental aspect of (it), like the sleep deprivation, and not the depleted calories," he said.

"There's a lot going on in your brain … living in that headspace for a while was very challenging."

The movie, which premiered at the festival on September 5, shows Bloom's character taking drastic measures to reach his goal weight, including using diuretics and draining blood from himself.

The premiere was an intense experience, with Bloom sharing that "Somebody in my row passed out! Yeah, we had a fainter," added Ellis. "I think we've got to put that on the film poster."

Bloom also revealed that his fiancée, Katy Perry, was deeply affected by the film. "She watched it and was like, 'I need a stiff drink,'" the actor said. "She was really moved. She knew what it took."