Organic Diet Reduces Pesticide Metabolites in Pregnant Women

Are organic foods really better for people’s health? Furthermore, are all organic foods created equal, and if not, which do we pick and why do we pick them? These seemingly simple questions are fraught with a barrage of personal and political beliefs and values. Yet the voice of reason often missing from the conversation is science. One reason for this knowledge gap is that studies involving dietary intervention (ie, replacing conventionally produced foods with organic foods) usually are conducted for only one to two weeks on small populations. This period of time isn’t long enough to provide conclusive evidence that a test group became healthier on an organic diet.

That’s why Cynthia Curl, PhD, MS, an assistant professor in Idaho’s Boise State University’s department of community and environmental health, has conducted what’s believed to be the first long-term diet intervention study on the effects of organic produce on pregnant women. Results of the Treasure Valley study revealed that adding organic produce to an individual’s diet, as compared with conventional produce, significantly reduced exposure to pyrethroid insecticides, which are neurotoxic to insects as well as humans in large enough doses.

For six months, spanning 20 women’s second and third trimesters, Curl’s two study groups were provided with weekly deliveries of fresh fruits and vegetables. One group was given organic produce, while the other received conventional produce. Weekly urine samples were collected from both groups and analyzed by the Centers for Disease Control and Prevention. The results showed that women consuming organic produce had significantly lower pesticide metabolites.

“This research is novel because it’s also the first study done in pregnant women, and there’s a lot of research showing that time in utero is a sensitive time for development,” Curl says. “So if we were to look for a health effect from decreasing pesticide exposure, one of the places we might see it—if it exists—is in this population.”

This study also proves the feasibility of conducting long-term organic diet intervention research among pregnant women. Curl believes that by following this study’s parameters with a much larger test group and then monitoring the health and development of the children after birth, it would be possible to conclusively answer the question of whether there’s a measurable health benefit to children if their mothers consume organic, rather than conventional, food during pregnancy.

“In order to look at the kind of health effects that we might be interested in, which would be neurological effects in the kids—like incidents of ADD [attention deficit disorder], changes in memory and IQ, things that we have seen in agricultural populations—we would need to have a sample size of maybe 500 pregnant women,” Curl says.

This study also demonstrates that it’s unnecessary to consume a fully organic diet to experience a significant change in pesticide exposure. By supplementing participants’ diets with organic fruits and vegetables, the authors better imitated how many people actually consume organic food as a part of their diet rather than the whole.

As the need to produce enough food for our growing global population escalates, so too has the urgency of the organic vs conventional foods debate. The higher costs of producing and buying organic produce, evolving agricultural practices, the effects of pesticides on the environment, the burgeoning $40 billion organic food industry: All of these elements, and many more, complicate and muddy an issue that still suffers from a lack of scientific understanding.

Yet Curl asserts that, organic or not, the proven health benefits of eating fruits and vegetables far outweigh any concerns about potential negative effects of pesticide exposure.

“Even as we learn more about the pesticide exposure that we might be getting from our diets, it’s important to put that in the right context and understand that the first order is to eat as many fruits and vegetables as possible,” Curl says. “If there are pesticides that are in our food supply at levels that would lead to negative health effects, the answer then is to introduce legislation that would reduce those levels in everyone’s food supply, not necessarily to simply encourage those who can buy organic to buy organic.”

— Source: Boise State University