As Radley Balko pointed out on Twitter, “Prediction: The activist public health crowd will go absolutely nuts over this study.” Jacob Sullum on a recent European health study:
Despite the familiar surgeon general’s warning advising women to abstain completely from alcoholic beverages during pregnancy “because of the risk of birth defects,” there has never been any solid evidence that light to moderate consumption harms the fetus (as Stanton Peele pointed out in Reason more than two decades ago). New research from Denmark, funded by the U.S. Centers for Disease Control and Prevention, indicates once again that heavy drinking is the real hazard. In a study of more than 1,600 women (“nearly a third of all Danish women who were pregnant between 1997 and 2003,” Maia Szalavitz notes in Time), children of women who consumed nine or more drinks per week during pregnancy had shorter attention spans and were five times as likely to have low IQs at age 5 than children of abstainers. But no such effects were apparent in the children of women whose alcohol consumption during pregnancy was light (one to four drinks per week) or moderate (five to eight drinks per week). “Our findings show that low to moderate drinking is not associated with adverse effects on the children aged 5,” the researchers said.
Szalavitz cautions that a “drink” as defined in this study contained 12 grams of pure ethanol, compared to the American standard of 14 grams, one-sixth more. Given the relatively wide consumption ranges, that difference probably does not matter much. Szalavitz also notes that, unlike earlier studies, this one asked women about their drinking while they were still pregnant, so the responses are less likely to be skewed by inaccurate recall. Still, self-reported drinking, especially by pregnant women, probably underestimates actual consumption, meaning that the amounts associated with no neurological impairment are apt to be bigger than those indicated by the study.
One of the issues with studies of this sort is the very need for self-reporting: most people, after a lifetime of public health warnings, will under-report their drinking (whether consciously or not). In this case, that’s a useful thing to provide some level of comfort in the findings: if most women in the study under-reported their actual intake of alcohol while pregnant, yet the children show no negative effects developmentally, we can concentrate on those few who really do over-indulge and whose children do suffer as a result.
