Pill-poppers beware: taking too much vitamin c may harden the arteries. That is the conclusion of a study presented by James Dwyer, an epidemiologist at the University of Southern California, to a meeting of the American Heart Association that was held last week in San Diego. Dr Dwyer and his colleagues used ultrasound to measure the thickness of the carotid arteries of nearly 600 people. They then linked their findings with information about their subjects' habits, including whether they were taking vitamin c pills.
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