Blake, who exited the house after being accused of trying to communicate with the outside world, has said she is determined to stay without food until she "passes out".
She said she is unable to afford the legal fees to fight a case against the show's producer Endemol and the broadcaster Channel 4 to obtain the unused footage taken of her on the show, and that refusing food to convince them otherwise was her "only option".
Blake has levelled the claim that the producers of the programme had edited her appearance on the programme to show her in an unfavourable light.
She says that she had to leave the house after the show's producers refused to hand over a suitcase that contained her treatments for skin condition eczema.
Blake claims that she was held against her will in the house and had asked to leave the house, but was refused the request, and that she needs evidence of her requesting to leave the house to support a complaint she has made to police.
She is also denying claims that she refused to wash while in the house and that the production team had labelled her a "smelly cheat" through the editing process.
Her hunger strike comes just a day after mental health charities slammed Big Brother for exploiting the housemates, and said that there needed to be more focus on screening the housemates for possible mental instability and that pressure on the contestants should not just be seen as "harmless entertainment".
A spokeswoman for the Channel 4 show said that Blake had been ejected from the 'Big Brother' house for breaking the rules.
Meanwhile, Lea, Richard and Sezer were nominated for eviction by their fellow housemates last night.
On hearing the news, Lea said: "I told ya." Sezer declared that he was "good", saying "well done boys". Richard looked shocked when he heard his name, but comforted Lea saying "you and me", promising to cheer her up as she burst into tears.
They face eviction from the house on June 2 after the nominations are voted for by the UK public. New housemates Aisleyne and Sam were not allowed to cast votes to evict their fellow housemates during their first week in the house.
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