Christina Ricci has blamed her dramatic weight loss on her latest film.The once-curvy star, who looks gaunt in new movie 'Black Snake Moan', insists she wanted to look "unhealthy" for her role as nymphomaniac Rae. Christina said: "When I did 'Ice Storm' and 'The Opposite of Sex', I was fifteen and sixteen. Realistically women do change a lot so I just lost my baby fat."As I have gotten older, I am starting to look more like my mother. But in this film, she is someone that doesn't take care of herself and I wanted her to look like that. I wanted her to look unhealthy."In 'Black Snake Moan' Christina's character is kidnapped by a blues-playing preacher played by Samuel L. Jackson.She is then chained to a radiator while the preacher tries to persuade her to tame her wild ways.But Christina, 27, insists she didn't find the experience uncomfortable - even though she spent hours in her underwear filming the disturbing scenes.She joked: "I was in my underwear so I was fine."Being chained up wasn't that bad. There are moments when I am wrangling the chain and the chain is causing me to be irritated. It provides insight into her character when she is alone with it."It didn't really hurt. I was careful."