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The Coffee Conundrum

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Java in a cup—so simple, and yet so baffling to scientists. Do you take it black or white? Two coffee studies last week--one good, one bad. Good news first: A study of more than 81,000 Japanese men and women linked heavy coffee drinking to a 23% lower death rate from cardiovascular disease. So did an earlier study at Harvard, in which women who drank two to four cups a day had a 20% lower risk of stroke than women who only drank the odd cup. However, this doesn’t prove that coffee alone is responsible for the drop, as the LA Times points out. “People who drink coffee are different in many ways from those who don’t drink coffee,” explains a USC researcher. Still, stroke risk was lowest among people who drank the most coffee. A cuppa Joe won’t do. Now the bad news: A survey published in the Journal of Urology (never a good sign) shows that women who drink four or more cups of coffee a day—the same magic number that produces the mysterious decrease in stroke risk—suffered an increased risk of, yes, that’s right, urinary incontinence. Though the risk was small—2.7% of high-caffeine women developed frequent “urine leakage” over the next four years, compared to 1.9% for the low-caffeine group—it was still a 20% increase in leaky bladders, when other factors were accounted for. Women are twice as prone to this condition as men.