United Kingdom, Aug. 12 -- Orlando Bloom suffered "paranoia and anxiety" due to his strict diet for The Cut.

The 48-year-old actor was "excited by the challenge" of transforming his physique to play a boxer in the upcoming thriller but he wasn't ready for the "mental toll" his extreme diet took, including a struggle to sleep and being consumed by "obsessive thoughts" about food.

He told People magazine: "What I hadn't expected and was surprised by was the mental toll that this kind of intense discipline takes.

"The paranoia and anxiety were very real and disturbing, caused by the lack of sleep - turns out you can't sleep when you're hungry!

"The water restriction to get to my lowest weight for the final scenes led to obsessive thought...