Should We Really Worry About Obesity's Link to Autism?

More

ultrasound main.JPG

Flickr/Michael Quinn

A new study this week linking motherhood obesity to childhood autism tells a seemingly horrible tale: pregnant women who are obese are 67 percent more likely to have a child who suffers from the disorder than her non-obese counterpart. It's the kind of statistic that people latch on to, and dozens of stories in the media highlighted the stat. 

But what can we actually make of such a figure? 67 percent sounds like a big deal. You're well on your way to doubling your risk, it seems. But without context, it's hard to gauge how much maternal obesity matters relative to the host of author autism risk facts.

While the 67 percent figure is "non-trivial," according to Dr. William Eaton, a professor of mental health at Johns Hopkins University, maternal obesity isn't exactly considered a leading risk factor. There are others that raise the risk for childhood autism by roughly the same amount, and still others that cause it to skyrocket.

For example, when a baby comes out of the womb feet-first, "a breech birth," the child's risk for autism increases about 63 percent. Babies with an Apgar score -- an indicator, from one to ten, of a child's relative health five minutes after birth -- of less than seven are about 89 percent more likely to be autistic, Eaton said.

"There are some studies about autism which have much stronger risk factors," Eaton added, "with hazard ratios like two or three or four," that is to say, a 200 or 300 or even 400 percent increase in risk.

Some of these more serious risk factors are simply out of our control. A child born before 35 weeks carries two and a half times the risk for autism. Family mental history can also play a role. If someone in your family suffers from psychosis or a mood disorder, the risk for childhood autism increases two to three times.

So, maternal obesity may be a risk factor for autism, but it's important to remember that it's only one among many and not even the strongest link.

And, Eaton said, separating out obesity, itself, from other linked disorders is a challenge in itself. "Just to show you how complicated things are, obese women could have a higher rate of mood disorder," he said. "And we wouldn't know if it was the mood disorder doing the work or the obesity."

Jump to comments
Presented by

Brian Fung is the technology writer at National Journal. He was previously an associate editor at The Atlantic and has written for Foreign Policy and The Washington Post.

Get Today's Top Stories in Your Inbox (preview)

Why Did I Study Physics?

In this hand-drawn animation, a college graduate explains why she chose her major—and what it taught her about herself.


Elsewhere on the web

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register. blog comments powered by Disqus

Video

Why Did I Study Physics?

Using hand-drawn cartoons to explain an academic passion

Video

What If Emoji Lived Among Us?

A whimsical ad imagines what life would be like if emoji were real.

Video

Living Alone on a Sailboat

"If you think I'm a dirtbag, then you don't understand the lifestyle."

Video

How Is Social Media Changing Journalism?

How new platforms are transforming radio, TV, print, and digital

Video

The Place Where Silent Movies Sing

How an antique, wind-powered pipe organ brings films to life

Feature

The Future of Iced Coffee

Are artisan businesses like Blue Bottle doomed to fail when they go mainstream?

Writers

Up
Down

More in Health

Just In