For his portrayal of insomniac Trevor Reznik in ‘The Machinist’ Christian Bale lost 62 pounds reducing his body mass to just 120 pounds, whilst for his acclaimed performances as Batman in ‘The Dark Knight’ trilogy he built up his muscle and physique to be the Gotham City saviour.
For his next role as former US Vice President Dick Cheney in Adam McKay’s biopic ‘Backseat’ he gained a significant amount of weight.