Filed Under:

Folic Acid For Pregnant Mothers Cuts Kids' Autism Risk

Play associated audio

A common vitamin supplement appears to dramatically reduce a woman's risk of having a child with autism.

A study of more than 85,000 women in Norway found that those who started taking folic acid before getting pregnant were about 40 percent less likely to have a child who developed the disorder, researchers reported in the Journal of the American Medical Association.

"That's a huge effect," says Ian Lipkin, one of the study's authors and a professor of epidemiology at Columbia University's Mailman School of Public Health.

Folic acid is the synthetic version of a B vitamin called folate. It's found naturally in foods such as spinach, black-eyed peas and rice. Public health officials recommend that women who may become pregnant take at least 400 micrograms of folic acid every day to reduce the chance of having a child with spina bifida.

The link between folic acid and autism risk is especially striking because the supplement is so cheap and easy to get, Lipkin says. "The notion that a very simple, nontoxic food supplement could reduce your risk is profound," he says.

There are caveats, though. To get the full benefit, mothers had to start taking folic acid supplements four weeks before conceiving and keep taking them during the first eight weeks of pregnancy. Risk reduction was also limited to severe autism, not milder forms such as Asperger's.

Despite public health campaigns urging women in the U.S. to take folic acid, many are still not taking the supplements when they become pregnant. That may be because spina bifida and related birth defects are quite rare.

"But when you start talking about autism, a disorder that has an incidence of 1 percent or higher, that really does bring it to home," Lipkin says. "That is a substantial risk."

In the U.S. some foods are fortified with folic acid. Yet women often do not get enough folate through diet alone, Lipkin says, even if they eat a lot of healthful foods.

"I have nothing at all against green vegetables and beans," he says. "But you only absorb about half of the dietary folate that you take in."

The study of Norwegian mothers is the biggest one so far to link folic acid to a reduced risk of autism, though smaller studies have reached a similar conclusion.

"This study is reassuring that folic acid supplementation not only is safe but actually decreases the rate of autism," says Susan Hyman, a professor of pediatrics at the Golisano Children's Hospital at the University of Rochester.

The study also offers a reminder that brain disorders are often linked to events that take place soon after conception. "Those very first weeks to months of brain development that can provide long-lasting differences in neurologic function," she says

Previous studies have found that factors including obesity and diabetes can also influence a mother's risk of having a child with autism, Hyman says.

Women who may become pregnant should eat a balanced diet, exercise, decrease stress and take supplements containing folic acid "so they can have the healthiest baby possible," she says.

Copyright 2013 NPR. To see more, visit http://www.npr.org/.

WAMU 88.5

Verdine White On 45 Years With Earth, Wind & Fire

Forty-five years ago, the band “Earth, Wind and Fire” introduced audiences to a new kind of funk--one that fused soul, jazz, Latin and pop. Bassist Verdine White talks to guest host Derek McGinty about breaking racial boundaries in music and how the band is still evolving.

NPR

If War Is Hell, Then Coffee Has Offered U.S. Soldiers Some Salvation

"Nobody can soldier without coffee," a Union cavalryman wrote in 1865. Hidden Kitchens looks at three American wars through the lens of coffee: the Civil War, Vietnam and Afghanistan.
WAMU 88.5

Virginia's Own Tim Kaine Takes The Democratic Veepstakes

We consider Democratic Sen. Tim Kaine's regional ties and the pros and cons of his vice presidential candidacy as the DNC gets underway.

NPR

Verizon Buys Yahoo For $4.8 Billion In Cash, Touting Gains In Mobile

The deal comes more than a year after Verizon paid $4.4 billion to acquire AOL; as part of Verizon, Yahoo will join the same division AOL currently occupies.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.