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Nature 433, 798-799 (24 February 2005) | doi:10.1038/433798a; Published online 23 February 2005

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Eating a healthy diet is hard work. There are hundreds of guides out there — often providing conflicting instructions. Deciding what advice to take means wrestling with a number of tough questions.

To make the jump from scientific data to specific recommendations for a healthy diet — that everyone should now eat nine servings of fruit and vegetables a day, for instance — the scientists on the US Dietary Guidelines Advisory Committee turned to computer modelling.

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