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LOS ANGELES (AP) _ Actress Renee Zellweger didn't run to the grocery store when she needed to gain weight for her role in ``Bridget Jones's Diary.''

A physician prescribed a healthy way for the 31-year-old actress, who plays a lovesick Londoner obsessed about her weight, to put on the pounds.

``He made a list and put together a healthful plan and said, `Well, you're going to have to add this if you want to achieve that,' and the portions were just bigger. Richer,'' she told reporters. ``I couldn't waste my meals on just like a spinach salad with balsamic. I had to put on some Thousand Island (dressing). And add a couple of croissants with butter.''

Zellweger said she was ``surprised'' to get the part.

``I had read ... that they were planning on doing a film version of the book and it would be made in England and ... here is a list of actresses, all of whom were English who would potentially play the role and that seemed right to me, and I didn't question it beyond that.''

Zellweger said she hopes the Bridget Joneses of the world will find ``inspiration, hopefully'' and ``a really, really good laugh.''

The film, which opens Friday, is based on the 1996 international best seller by Helen Fielding.