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Actor Mark Ruffalo is playing twins in his upcoming release, I Know This Much Is True for which he had to take five weeks off to gain 30 pounds.

Mark is playing identical twins who look completely different, because they’ve lived different lives for 40 years.

Mark Ruffalo Felt ‘Lonely’ On Taking 5 Weeks Off To Gain 30 Pounds

The identical twins, named Thomas and Dominick in the film shared stark different lives. Thomas is schizophrenic and has been on years of medication, while Dominick is not.

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In order to play the two men, Ruffalo first shot for all his scenes as Dominick for 15 weeks, and then he took a few weeks off and gained 30 pounds, showrunner Derek Cianfrance shared at the TV Critics Association Winter Press Tour on Wednesday, reports eonline.com.

“We didn’t want it to be like I run and throw a wig on and do the same scene in the same day, so we took six weeks off to really separate these two guys. And Thomas is on medication, mood stabilizers, and anti-psychotics. A lot of people put on weight.”

However, those weeks of gaining weight and preparing to play the other — much more troubled brother — were hard for Ruffalo.