Updated: August 26, 2011

If you rely on coffee, tea, orcola for a daily pick–me–up,consider this: New studiesreveal that caffeine canhave an effect on yourblood sugar, cancer risk,and more. Here, thesurprising up– and downsidesof this stimulant.

It may protect againstovarian cancer In oneHarvard study, womenwho consumed at least 500 milligrams of caffeine were20 percent less likely to develop ovarian cancer than those whogot less than 136 milligrams. However, the researchers aren'tcertain how caffeine may guard against the disease and say it'stoo soon to recommend upping your caffeine intake.

It raises diabetics' blood sugar levels Research shows that coffeecan lower your diabetes risk, but if you already have the disease or areat risk for it, you may need to cut back on the java. A Duke Universitystudy found that when diabetics consumed 500 milligrams of caffeinea day, their blood sugar readings were 8 percent higher.

It raises miscarriage risk Taking in 200 milligrams of caffeine, orthe equivalent of about two cups of coffee or two energy drinks, aday during pregnancy may double the risk of miscarriage, reportsa study in theAmerican Journal of Obstetrics and Gynecology.

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