News / Health

Scientists Link ADHD to Pesticides

Scientists Link ADHD to Pesticides
Scientists Link ADHD to Pesticides
Jessica Berman

Scientists have found that exposure to pesticide residues on vegetables and fruit may double a child's risk of attention deficit hyperactivity disorder (ADHD) a condition that causes inattention, hyperactivity, impulsivity or a combination of all three in children.

According to the U.S. Centers for Disease Control and Prevention, between three and seven percent of school age children in the United States have ADHD, which makes them impulsive and impairs concentration in the classroom.

In the study, researchers with the University of Montreal and Harvard University tested the urine of more than 1,100 children, between the ages of eight and 15, looking for breakdown products of organophosphate pesticides.  119 of the children in the study had been diagnosed with ADHD.

"What we saw was that the higher the level of pesticide residues in the urine, the higher the risk of ADHD in the children," said Maryse Bouchard, who led the team of researchers.

Investigators found the risk of ADHD was almost double in youngsters with higher levels of the most common breakdown metabolite, compared to children with nearly undetectable levels.

Researchers say 40 organophosphate pesticides are registered with the U.S. government.

Organophosphates are among the most widely used pesticides by growers to protect fruit and vegetables.  Studies have showed that organophosphates cause hyperactivity and cognitive defects in laboratory animals, as well as neural changes.

Bouchard, who is with the University of Montreal's Department of Environmental and Occupational Health, says she is not surprised by the finding, although she cautions it is too early to draw any firm conclusions.

"We can't affirm that exposure to pesticides is causing ADHD," she added.  "We would need a different kind of study to say that."

Lynn Goldman is with the Department of Environmental Health Sciences at Johns Hopkins University School of Public Health in Baltimore.  Goldman says the use of pesticides, including organophosphates, is widespread in developing countries, where children are exposed to high levels of pesticides through farming.

"Those kids have much more serious, much more severe, neurological problems," said Goldman.  "So, we do see evidence of effects in those populations globally."

Goldman says studies will probably now be conducted in other nations to determine how pesticides affect brain development in children.

A 2008 study of produce in the United States found organophosphate residues in 28 percent of frozen blueberry samples, 25 percent of fresh strawberry samples and 19 percent of celery samples.

The new study on pesticides and attention deficit hyperactivity disorder appears in the journal Pediatrics.

You May Like

Video Positive Messaging Helps Revamp Ethiopia's Image

In country once connected with war, poverty, famine, headlines now focus on fast-growing economy, diplomatic reputation More

Russian Activist Thinks Kremlin Ordered Nemtsov's Death

Alexei Navalny says comments of Russian liberals who think government wasn't involved are 'nonsense.' More

Video Land Disputes Rise Amid Uganda Oil Boom

Investors appear to be cashing in by selling parcels of land to multiple buyers More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Positive Messaging Transforms Ethiopia's Imagei
X
Marthe van der Wolf
March 03, 2015 9:03 PM
Ethiopia was once known for famine and droughts. Now, headlines more often point to its fast-growing economy and its emergence as a regional peacemaker. How has Addis Ababa changed the narrative? VOA's Marthe van der Wolf reports.
Video

Video Positive Messaging Transforms Ethiopia's Image

Ethiopia was once known for famine and droughts. Now, headlines more often point to its fast-growing economy and its emergence as a regional peacemaker. How has Addis Ababa changed the narrative? VOA's Marthe van der Wolf reports.
Video

Video Cyber War Rages Between Iran, US

A newly published report indicates Iran and the United States have increased their cyber attacks on each other, even as their top diplomats are working toward an agreement to guarantee Iran does not develop a nuclear weapon and to free Iran from international sanctions. The development is part of a growing global trend. VOA’s Al Pessin reports from London.
Video

Video Answers Elude Families of MH370 Passengers

For the families on board Malaysia Airlines flight MH370, an airline official’s statement nearly one year ago that the plane had lost contact with air traffic control at 2:40 AM is the only thing that remains confirmed. William Ide reports.
Video

Video Land Disputes Arise Amid Uganda Oil Boom

Ugandan police say there has been a sharp increase in land disputes, with 10 new cases being reported each day. The claims come amid an oil boom as investors appear to be cashing in by selling parcels of land to multiple buyers. Meanwhile, the people who have been living on the land for decades are chased away, sometimes with a heavy hand. VOA's Serginho Roosblad reports.
Video

Video In Russia, Many Doubt Opposition Leader's Killer Will Be Found

The funeral has been held in Moscow for Boris Nemtsov, the opposition leader who was assassinated late Friday just meters from the Kremlin. Nemtsov joins a growing list of outspoken critics of Russia under the leadership of President Vladimir Putin who are believed to have been murdered for their work. VOA’s Daniel Schearf reports from Moscow.
Video

Video Simulated Astronauts Get Taste of Mars, in Hawaii

For generations, people have dreamed of traveling to Mars to explore Earth's closest planetary neighbor. VOA's Mike O'Sullivan reports that while space agencies like NASA are planning manned missions to the planet, some volunteers in Hawaii are learning how humans will cope with months in isolation on a Mars base.
Video

Video Destruction of Iraq Artifacts Shocks Archaeologists

The city of Mosul was once one of the most culturally rich and religiously diverse cities in Iraq. That tradition is under attack by members of the Islamic State who have made Mosul their capital city. The Mosul Museum is the latest target of the group’s campaign of terror and destruction, and is of grave concern to archaeologists around the world. VOA’s Kane Farabaugh reports.
Video

Video Smartphones May Help in Diagnosing HIV

Diagnosing infections such as HIV requires expensive clinical tests, making the procedure too costly for many poor patients or those living in remote areas. But a new technology called lab-on-a-chip may make the tests more accessible to many. VOA’s George Putic reports.
Video

Video Afghan Refugees Complain of Harassment in Pakistan

Afghan officials have expressed concern over reports of a crackdown on Afghan refugees in Pakistan following the Peshawar school attack in December. Reports of mass arrests and police harassment coupled with fear of an uncertain future are making life difficult for a population that fled its homeland to escape war. VOA’s Ayesha Tanzeem reports from Islamabad.
Video

Video Ukrainian Volunteers Prepare to Defend Mariupol

Despite the ongoing ceasefire in Ukraine, soldiers in the city of Mariupol fear that pro-Russian separatists may be getting ready to attack. The separatists must take or encircle the city if they wish to gain land access to Crimea, which was annexed by Russia early last year. But Ukrainian forces, many of them volunteers, say they are determined to defend it. Patrick Wells reports from Mariupol.
Video

Video Moscow Restaurants Suffer in Bad Economy, Look for Opportunity

As low oil prices and Western sanctions force Russia's economy into recession, thousands of Moscow restaurants are expected to close their doors. Restaurant owners face rents tied to foreign currency, while rising food prices mean Russians are spending less when they dine out. One entrepreneur in Moscow has started a dinner kit delivery service for those who want to cook at home to save money but not skimp on quality. VOA's Daniel Schearf reports.
Video

Video Presidential Hopefuls Battle for Conservative Hearts and Minds

One after another, presumptive Republican presidential contenders auditioned for conservative support this week at the Conservative Political Action Conference held outside Washington. The rhetoric was tough as a large field of potential candidates tried to woo conservative support with red-meat attacks on President Barack Obama and Democrats in Congress. VOA Political Columnist Jim Malone takes a look.
Video

Video Southern US Cities Preserve Civil Rights Heritage to Boost Tourism

There has been a surge of interest in the American civil rights movement of the 1950s and '60s, thanks in part to the Hollywood motion picture "Selma." Five decades later, communities in the South are embracing the dark chapters of their past with hopes of luring tourism dollars. VOA's Chris Simkins reports.
Video

Video Deep Under Antarctic Ice Sheet, Life!

With the end of summer in the Southern hemisphere, the Antarctic research season is over. Scientists from Northern Illinois University are back in their laboratory after a 3-month expedition on the Ross Ice Shelf, the world’s largest floating ice sheet. As VOA’s Rosanne Skirble reports, they hope to find clues to explain the dynamics of the rapidly melting ice and its impact on sea level rise.

All About America

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More