Pregnant women who had more than two caffeinated drinks a day while
trying to conceive had a 74 percent higher risk of miscarriage than
their peers who drank less coffee, tea, soda and energy drinks, the
study found.
When their husbands and boyfriends had more than two caffeinated
drinks a day during the baby-making phase, however, these pregnant
women ended up with almost the same increased risk of miscarriage
they would get from drinking coffee or soda themselves.
“We are not saying to stop drinking caffeinated beverages,” said
lead study author Germaine Buck Louis of the Eunice Kennedy Shriver
National Institute of Child Health and Human Development in
Rockville, Maryland.
“Rather, our data suggest that men and women, should they continue
to drink caffeinated beverages, might be advised to keep the amount
to less than three daily drinks,” Louis added by email. “We did not
find drinking one to two daily caffeinated beverages to increase the
risk of miscarriage.”
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Scientists aren’t sure how caffeine contributes to miscarriages, but
it’s possible it affects egg or sperm production, implantation of
the fertilized egg, or the ability of the embryo to grow in the
uterus.
To assess how lifestyle choices may influence miscarriage risk,
Louis and colleagues followed 344 couples in Texas and Michigan
through the first seven weeks of pregnancy.
All of the couples recorded their daily use of cigarettes,
caffeinated and alcoholic beverages, and multivitamins.
Overall, 98 women, or 28 percent, experienced a miscarriage during
the study, as reported in the journal Fertility and Sterility.
Women 35 or older had nearly double the miscarriage risk of younger
women, the study found.
When women took daily multivitamins, their miscarriage risk was 55
percent lower than for their peers who didn’t do this.
The study wasn’t designed to prove that excessive caffeine
consumption causes miscarriages, or that vitamins prevent pregnancy
loss, the authors note.
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It’s possible that women who cut back on caffeine did so because
they were experiencing food aversions and vomiting – both signs of a
healthy pregnancy – and this might explain some of the connection
between miscarriages and caffeine, the researchers point out.
One surprise in the study is that researchers didn’t find an
increased miscarriage risk associated with smoking or alcohol,
however.
This doesn’t mesh with previous research, noted Dr. Jeffrey
Goldberg, a reproductive health researcher at Cleveland Clinic in
Ohio who wasn’t involved in the study.
“This study did not address the fact that both smoking and alcohol
use can reduce pregnancy rates and increase the risk of adverse
effects on fetal development,” Goldberg said by email.
Doctors currently advise couples trying to conceive to avoid delays,
especially when they’re over 35, and counsel women to limit caffeine
and take multivitamins, Goldberg noted.
Now, it seems men have something new to add to their to-do list.
“We would now have to recommend that the male partners also reduce
their caffeine intake,” Goldberg said.
SOURCE: http://bit.ly/1XVYQSl Fertility and Sterility, online March
24, 2016.
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