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ON THE MAP

Scientists who study vitamin D can't help but notice that a host of diseases seem to vary with latitude. Type 1 diabetes, multiple sclerosis and even some cancers appear to be more common in areas that get less sun -- meaning less opportunity for the body to produce vitamin D. The maps above illustrate the apparent link between solar radiation and breast cancer mortality rates. Credit: Source, from top: D. M. Harris and V.L.W. Go / /J. of Nutrition 2004; National Cancer Institute

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