November 13, 2008 2:53 PM

Scientists rethinking what makes us get old

For half a century, much of the deterioration that comes over time has been blamed on "free radicals — toxic, unstable molecules of oxygen running amok in the cells of your body. But views on the central role of free radicals are changing. Now genes, environment, nutrition and lifestyle also are recognized as parts of a complex web of factors that cause aging.

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