Mark Ruffalo Reveals He Ate 1,000 Calories A Day To Lose 20 Lbs. For HBO Show

To play both identical twins in the new HBO series 'I Know This Much Is True,' Mark Ruffalo underwent an extreme diet change. He even took on a daily challenge of '500 pushups.'

Mark Ruffalo Reveals He Ate 1,000 Calories A Day To Lose 20 Lbs. For HBO Show

To play both identical twins in the new HBO series 'I Know This Much Is True,' Mark Ruffalo underwent an extreme diet change. He even took on a daily challenge of '500 pushups.'