Hasselbeck's book, "The G-Free Diet: A Gluten-Free Survival Guide" has appeared over the last month in several best-selling lists.
The lawsuit was filed by author Susan Hassett, who says she sent Hasselbeck a copy of her "Living With Celiac Disease" book as a courtesy after the TV celebrity disclosed she had the illness last year.
A lawyer for Hassett declined to comment Tuesday. A phone message left with Hasselbeck's agent, Andy Cohen, was not immediately returned.
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