Oscar Isaac says he drank booze to pile on extra weight for his role in 'Inside Llewyn Davis'.

The 33-year-old actor claims he binged on fatty foods and alcohol in bid to fatten up for the lead role as a struggling '60s folk singer in the musical comedy.

Speaking at a Peggy Siegal lunch at New York's 21 Club on Tuesday (03.12.13), Issac claimed he packed on extra weight for the role through a diet of ''pasta, ice cream and a lot of drinking''.

He added: ''I definitely had to look a little more schlumpy, someone that's not taking care of himself.''

Isaac also revealed his passion for music and claims he spends his spare time singing and playing the guitar when he's not acting, as he explained: ''If I go too long without playing the guitar, I get depressed.''

'Inside Llewyn Davis' - which recently won Best Picture at the Gotham Awards - sees Isaac star alongside Carey Mulligan and Justin Timberlake in a story which follows a week in the life of a struggling musician trying to overcome obstacles during the Greenwich Village folk scene in 1961.