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The lawyer said that Winslet did visit the institute but received treatment for a neck injury, not dieting advice.
Winslet had complained to the magazine, saying that the story suggested that "she had lied to the public when she had said that she refused to bow to pressure to be skinny and celebrated her curves".
In a statement released by her solicitors today, Winslet said: "Grazia magazine have apologised to me in full, and admitted that their story was incorrect, which gives me tremendous peace of mind."
"I feel very strongly that 'curves' are natural, womanly and real. I shall continue to hope that women are able to believe in themselves for who they are inside, and not feel under such incredible pressure to be unnaturally thin."
The actress will donate the settlement to an eating disorder charity.