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Health Research

January 21, 2008

Kaiser Permanente Study Shows Newer, Stronger Evidence that Caffeine During Pregnancy Increases Miscarriage Risk

High doses of daily caffeine during pregnancy – whether from coffee, tea, caffeinated soda or hot chocolate – cause an increased risk of miscarriage, according a new study by the Kaiser Permanente Division of Research.

The research appears in the current online issue of American Journal of Obstetrics and Gynecology.

While previous research showed a link between caffeine consumption and miscarriage, this is the first study to thoroughly control for morning sickness, which typically causes many women to avoid caffeine.

The study, which looked at 1,063 pregnant Kaiser Permanente members in San Francisco from October 1996 through October 1998, examined the caffeine effect among women who never changed their pattern of caffeine consumption during their pregnancy. Women who consumed 200 mg or more of caffeine per day (two or more cups of regular coffee or five 12-ounce cans of caffeinated soda) had twice the miscarriage risk as women who consumed no caffeine.

The increased risk of miscarriage appeared to be due to the caffeine itself, rather than other possible chemicals in coffee because caffeine intake from non-coffee sources such as caffeinated soda, tea and hot chocolate showed a similar increased risk of miscarriage.

For details, read this news release.