Charlize Theronis devoted to her craft to give life to roles that can be demanding such asTullyandMonster.
Both roles required the star to make physical changes something that Theron is not keen on ever doing again.
I will never, ever do a movie again and say, Yeah, Ill gain 40 pounds.

Charlize TheronNewmarket / Ernesto S. Ruscio / Getty Images / Kimberly French / Focus Features / Courtesy Everett Collection
I will never do it again because you cant take it off, she toldAllure.
When I was 27, I didMonster.
I lost 30 pounds, like, overnight.

I missed three meals and I was back to my normal weight.
And he was like, Youre over 40.
Your metabolism is not what it was.
Nobody wants to hear that, she added.
I cant sit down on the toilet, she says, laughing.
Its all those very real moments.