By Annie Murphy Paul
Sunday, November 14, 2010;
"Pregnant Is the New Sexy," read the T-shirt a friend gave me when I was a few weeks away from my due date. With my swollen ankles and waddling walk, I wasn't so sure - but it's hard to deny that pregnancy has become rather chic. Glossy magazines flaunt actresses' and models' rounded, half-clad bellies on their covers. Inside they chronicle celebrities' pregnancies in breathless detail, from the first "bump" sighting to the second-trimester weight gain to the baby-gear shopping spree. And now comes the news that "What to Expect When You're Expecting" - the advice bible that has sold more than 14 million copies - will be made into a feature film.
There's something wrong with this picture. Even as Americans fuel a rapidly growing pregnancy industry of designer maternity jeans and artsy pregnancy portraits, we're ignoring the real news about these nine months. An emerging science known as the developmental origins of health and disease - DOHaD for short - is revealing that the conditions we encounter in the womb can have a lifelong impact on our health and well-being, affecting everything from our appetite and metabolism to our susceptibility to disease to our intelligence and temperament.
The more we learn about these effects, the clearer it becomes that investing in maternal health would return larger and longer-lasting dividends than almost any other comparable public health investment. But as a nation, we're heading in exactly the opposite direction, spending more and more of our limited resources on the later stages of life instead of where they can make the most difference: at the very beginning.
Take obesity. Many anti-obesity initiatives concentrate on changing adults' behavior, trying to persuade us to eat less and exercise more. But research shows that these efforts have limited effectiveness. A recent analysis of U.S. obesity-prevention campaigns, conducted by Olaf Werder of the University of New Mexico, concluded that their "overall impact on obesity has been negligible."
Even public health programs aimed at school-age children come too late: Almost a third of American children over age 2are already overweight or obese, according to the National Health and Nutrition Examination Survey. Clearly, the conditions that contribute to obesity must begin exerting their influence very early in children's lives - as early as their time in the womb.
DOHaD research shows that the intrauterine environment of a woman who is significantly overweight when she conceives - or who puts on excessive weight during pregnancy - affects the developing fetus in ways that make it more likely to become overweight itself one day. Scientists are still figuring out exactly why this happens, but it appears that prenatal experience may alter the functioning of organs such as the heart and the pancreas, may shift the proportion of lean and fat body mass, and may influence the brain circuits that regulate appetite and metabolism.
In a cleverly designed study published in the Journal of Clinical Endocrinology and Metabolism in 2009, researchers compared children born to the same mothers before and after they'd had successful anti-obesity surgery. Children born after their mothers' surgery weighed less at birth and were three times less likely to become severely obese than their older brothers and sisters. Weight-loss surgery isn't for everyone, of course. Still, what if before conceiving, overweight women were routinely counseled by their doctors about the effects of their weight on future offspring? And what if women who were gaining weight too rapidly in pregnancy were offered more help in controlling it?
The results might look something like those found in studies of diabetes treatment during pregnancy. Research shows that the children of diabetic women are more likely than others to develop diabetes - in one recent study, seven times more likely. Like obesity, diabetes has a strong genetic component, but scientists are also beginning to focus on the effects of a diabetic intrauterine environment. For example, a long-running study of the Pima Indians of Arizona, who have one of the highest rates of diabetes in the world, concluded that exposure to the disease while in the womb was responsible for about 40 percent of the diabetes cases studied.
A pregnant woman's diabetes can also affect the odds that her child will become obese. In a study of almost 10,000 mother-child pairs, researchers from the Center for Health Research at Kaiser Permanente Northwest found that women who developed diabetes during pregnancy and were not treated had children who were twice as likely to become obese as the children of women without that illness. Pregnant women whose diabetes was treated with insulin, however, had children with no additional risk of obesity. Simply by controlling their mothers' blood sugar during pregnancy, in other words, the expected doubling of these children's obesity risk was completely reversed.
Even the mental health of a pregnant woman can have a long-term impact on her offspring. A 2008 study by researchers at the Kaiser Permanente Oakland Medical Center in California found that women with even mild symptoms of depression are 60 percent more likely to deliver early than other women; those who are severely depressed have double the risk of premature birth. The babies of depressed women are also more likely to have low birth weight, to be irritable and to have trouble sleeping.
Of course, these complications may come about in part because many depressed women don't take good care of themselves: They may eat poorly, smoke or drink alcohol, or fail to get prenatal care. But depression itself may shift the biochemical balance in a woman's body in a fateful manner. For one thing, the stress hormone cortisol, which is often elevated in people with depression, may cross the placenta, directly affecting fetal development, and it may also affect a pregnant woman's blood vessels, reducing the oxygen and nutrients that reach the fetus.
The case seems pretty clear: We should make a nationwide effort to ensure that every obstetrician checks every pregnant patient's mental state, along with her weight and blood pressure. Women who show signs of depression should be offered therapy or, in cases that warrant it, carefully administered antidepressant medication.
Adult behavior can be difficult to change, as we know from the general ineffectiveness of anti-obesity campaigns. But pregnant women are a special case: They're usually highly motivated, they're typically in regular contact with health-care providers, and they have to keep up their efforts for only nine months. Pregnancy therefore offers a singular opportunity to improve lives for decades to come, via interventions that cost little compared with the enormous price tags for obesity, diabetes, low birth weight and premature delivery.
So why isn't this critical window one of our top health-care priorities?
Part of the reason may simply be our preference for quick fixes and for dealing with only those problems that exist in the here and now. It can be hard to wrap our heads around the notion that a woman's diet or mental state today will have a serious effect on her children's health many years out. But there's a less obvious reason that resistance to maternal health initiatives might crop up among the liberal-leaning individuals who typically support public health initiatives and women's health-care issues: abortion politics.
Caring for the fetus, protecting the fetus from harm - to abortion rights advocates, such measures sound like the steps antiabortion forces have taken to try to establish a fetus's rights. What's the difference between controlling a diabetic pregnant woman's blood sugar and, say, charging a pregnant woman who uses drugs with child abuse? Between telling an obese pregnant woman that her weight may predispose her child to obesity and requiring a woman to look at an ultrasound of her fetus before proceeding with an abortion?
The crucial difference lies in the intent behind the intervention and in the way it's carried out. Help in achieving a healthy pregnancy must be offered to pregnant women, not forced upon them. And the aim behind such efforts must be to foster the health and well-being of the woman and her fetus, not to score political points.
Ultimately, research on the developmental origins of health and disease should lead us to a new perspective on pregnancy, one that's not about coercing or controlling women - nor about ogling or fetishizing them - but about helping them, and their future children, be as healthy and as happy as they can be.
Annie Murphy Paul is the author of "Origins: How the Nine Months Before Birth Shape the Rest of Our Lives."