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Caffeine — present in coffee, tea, soft drinks, and food products containing chocolate, as well as in over-the-counter pain medications — might be the most commonly ingested drug worldwide. To determine whether caffeine consumption correlates with risk for breast cancer, investigators analyzed data from more than 39,000 participants in the Women’s Health Study who completed food-frequency questionnaires at baseline.
During a mean follow-up of 10 years, 1188 women received diagnoses of invasive breast cancer. Overall, consumption of caffeine and caffeinated beverages was not significantly associated with breast cancer risk; after controlling for known risk factors, relative risks for breast cancer were 1.02 for the highest versus lowest quint…