Moderate boozing ups miscarriage risk by 66%
Washington: Drinking just two glasses of alcohol a week can raise miscarriage risk in early pregnancy by 66 percent, a new study has revealed.
Despite some studies showing that light drinking during pregnancy is fine, the new research, which included over 90,000 women, offer the strongest evidence yet that playing it safe might be the best strategy for women who are gestating.
“You should never give a recommendation based on a single study,” said lead author Anne-Marie Nybo Anderson, an epidemiologist at the University of Copenhagen.
“But if I was to give a recommendation to my daughter, I would say that if you plan a pregnancy and if you want to be careful and do everything you can in order to not harm your future baby, then I think you should stop drinking when you start trying to become pregnant, and then after the first four months you can be a little more relaxed.”
Undoubtedly heavy or binge drinking during pregnancy is dangerous to a developing foetus but research on the effects of low levels of alcohol consumption has offered contradictory results, with conclusions depending on the way studies are designed and even the country where studies are done, the Discovery News reported.
For the new study, Nybo Andersen and colleagues took advantage of a natural experiment in Denmark. For quite a few years in the late 1990s, the country’s national health board relaxed its recommendations for pregnant women, suggesting that they usually avoid alcohol but if they decided to drink, they should not have more than a drink a day and they should not drink every single day.
The new guidelines turned moderate drinking during pregnancy into standard and permissible behaviour for Danish women.
Having a glass of wine with a baby on board was no longer associated with depression or other negative health habits. It became just a normal thing to do, and many women indulged - before the health board reversed its guidelines and became stringent again after a few years.
During that period of societal permissiveness, a national program enrolled more than 100,000 pregnant women to participate in a Birth Cohort study.
The participants were asked several questions about their lifestyles, health behaviours and pregnancies through digital telephone interviews.
They also revealed how much alcohol they had drunk before and how much they drank after getting pregnant.
Mothers entered the study when they were six weeks pregnant, and follow-up interviews recorded the eventual outcomes of their births.
Overall, about 55 percent of the Danish women continued drinking alcohol while pregnant during the study period. Only 2 percent averaged more than four drinks a week, and majority of them drank far more moderately.
However, according to the study, it only took two drinks a week to increase the risk of miscarriage during the first 16 weeks by 66 percent.
Women who drank between half a drink and one and a half drinks each week showed a 19 percent increased risk in pregnancy loss, but only at the start of the second trimester. After the first four months, light drinking did not seem to make a difference in rates of miscarriage or stillbirth.
“I was pretty sure that alcohol intake at such low amounts in pregnancy would not have dramatic effects,” Andersen said.
“But what we found was that there was quite a high risk for miscarriage with moderate alcohol intake, and there was a stronger risk the earlier in pregnancy we looked,” Andersen added.
The study has been reported in the International Journal of Epidemiology.
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