Study: Caffeine may boost miscarriage risk

New research out Monday may have expecting moms rethinking their drinking habits.

A new study has found that pregnant women who consumed more than 200 milligrams of caffeine a day, equivalent to about two cups of coffee, had twice the risk of miscarriage as the women who consumed no caffeine at all. The findings are published in Monday’s Journal of Obstetrics and Gynecology.

Previous studies have found similar results, but Dr. De-Kun Li, lead author and investigator with the Kaiser Permanente Division of Research, is quick to point out the significance of his findings. “We were able to address the issue of if the increase is really due to caffeine or due to women changing their drinking patterns. Other studies have reported the same results but had some biases in the research.”

HOW MUCH BUZZ?

Just how much is 200 milligrams of caffeine? We did the math for you.

 

 

• one to two cups of coffee (12 oz. serving)

   

• two to three cups of tea (12 oz. serving)

   

• one to three energy drinks

   

• about five cans of soda

 

Amounts are estimates; actual caffeine content may vary by brand

The Kaiser study looked at 1,063 women in the early stage of pregnancy. Among women who consumed no caffeine, the miscarriage rate was 12.5 percent. In comparison, 25.5 percent of women who consumed more than 200 mg of caffeine a day miscarried. Although there was an increased risk for women who consumed fewer than 200 mg of caffeine a day, the lead investigator says the increase is not statistically significant.

Researchers say it made no difference whether the caffeine came from coffee, soda, tea or hot chocolate.

Caffeine is dangerous during pregnancy, Li said, because it can cross through the placenta to the fetus and can be difficult for the fetus to metabolize the caffeine. Caffeine may influence cell development and decrease blood flow to the placenta, he added. If arteries are constricted it may restrict blood flow which can result in miscarriage.

-from CNN.com