As Variety reports, Orlando's character in the film is on the verge of a complete breakdown as he races against time to lose weight before the fight.

They are guided on their journey by a shady coach played by John Turturro.

Orlando's character will do anything to lose weight, even if it puts his life at risk.

According to 'Variety', Orlando lost 23 kilos in three months to prepare for the film, which also stars Caitriona Balfe. She discussed her surprising physical transformation at the Toronto Film Festival.

He told 'Variety,' "I basically cut out food over a three-month period until right before filming, (when) I was at my lightest. I had lost 52 pounds, and I was about 185 when I started. I was too overweight and too mentally weak to feed myself tuna and cucumbers for a long time."

Since the film follows the boxer on an often harrowing journey to make it to a lower weight class, Ellis shot 'The Cut' in reverse chronological order, meaning Orlando was actually growing up during production .

"Basically your brain is filled with calories," Ellis told Orlando.

"It was becoming impossible for him to work while dieting. So, he came to us at his lightest, and then he started eating. So that meant we had to shoot the end of the film first and the beginning and the end of the film. In... 25 days when we were shooting, he was increasing calories and then it was edited back."

Orlando said the physical transformation was more "exciting" than "difficult".