A new study suggests that not every healthy person benefits from regular exercise: for a small 7% minority it may increase heart and diabetes risk factors. The researchers did not suggest this should stop people exercising but point to the importance of using this type of knowledge to personalize exercise programs. Claude Bouchard, a professor of genetics and nutrition in the Human Genomics Laboratory at Pennington Biomedical Research Center, Baton Rouge, Louisiana, in the US, was lead author of the study, which was published online in PLoS ONE on 30 May...

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