The 30-year-old actor had been due to play the father of a murdered girl in the hit film, and decided to bulk up for the role by gaining 60lbs.
But director Peter Jackson reportedly didn't share his vision and thought the father should be slim.
Gosling told the Hollywood Reporter, 'We had wildly different ideas of what the film should be... I was 150 pounds when he (Jackson) hired me, and I showed up on set 210 pounds. We had a different idea of how the character should look. I really believed he should be 210 pounds.
'I was melting Haagen Dazs (ice-cream) and drinking it when I was thirsty.
'I just showed up on set, and I had gotten it wrong. Then I was fat and unemployed.'
The role eventually went to Mark Wahlberg.