A recent study by US researchers is providing strong evidence for the hypothesis that caffeine consumption during pregnancy leads to increased risk of miscarriage. The study involved 1,063 pregnant women who maintained their caffeine habits throughout their pregnancies. Those women who drank more than 200 milligrams of caffeine a day, the equivalent of two cups of coffee or five cups of caffeinated soda, were twice as likely to miscarry as compared to pregnant women who avoided the stimulant compound. The risk of miscarriage was also increased when women consumed caffeine in tea and hot chocolate.