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Higher Caffeine Intake Levels Not Associated With Irregular Heart Rhythm

August 23, 2010: 08:48 PM EST
Research by U.S. and Swiss scientists has found that consuming higher levels of caffeine does not increase the risk of abnormal heart rhythm (atrial fibrillation) in women, but in small amounts may actually reduce the risk. The researchers collected data from a study of nearly 34,000 women who participated in a randomized trial evaluating low-dose aspirin and vitamin E intake. Questionnaires provided information on caffeine consumption from coffee, cola, and chocolate. Intakes of caffeine consumption were calculated using data from food manufacturers. Fourteen years of follow-up found 945 incidents of atrial fibrillation (AF), but none of the caffeine sources were significantly associated with AF. On the contrary, small to moderate caffeine intake seemed to protect the women from atrial fibrillation.
David Conen, Stephanie E Chiuve, Brendan M Everett, Shumin M Zhang, Julie E Buring and Christine M Albert, "Caffeine consumption and incident atrial fibrillation in women", The American Journal of Clinical Nutrition, August 23, 2010, © American Society for Nutrition
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