Pregnant women who consumed 2 or more mugs of coffee a day were twice more likely to miscarry than those who abstained from caffeine. It is suggested that pregnant women may wish to reduce or stop drinking containing caffeine, including coffee and tea.
The study involved 1063 pregnant women in San Francisco. The study found that women who drank more than 200mg or more of caffeine a day - the amount contained in 2 or more regular cups of coffee or 5, 12oz (330ml) cans of caffeinated drinks - double their risk of miscarriage compared with women who drank no caffeine.
However, this study has some limitations, including difficulty in making sure that the results are not affected by other factors that are known to increase the risk of a miscarriage.
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