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Allergies Health Center

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Food Allergies Linked to Pesticides

WebMD Health News
Reviewed by Louise Chang, MD

Dec. 3, 2012 -- People exposed to higher levels of certain germ- and weed-killing chemicals may also be more likely to develop food allergies, a new study shows.

The chemicals are called dichlorophenols (DCPs). They are created by the breakdown of common pesticides, including chlorinated chemicals used to purify drinking water. They also turn up in moth balls, air fresheners, deodorizer cakes in urinals, and certain herbicides sprayed on crops.

“They’re quite common,” says researcher Elina Jerschow, MD, an allergist at Montefiore Medical Center in the Bronx, N.Y.

Doctors don’t know why, but rates of food allergies are rising in the U.S. A 2008 study by the CDC found an 18% jump from 1997 to 2007.

Jerschow wondered if increased protection from germs might somehow be lowering the body’s tolerance to foods.

Pesticides and Food Allergies

Using data collected by the National Health and Nutrition Examination Survey (NHANES), she compared levels of the chemicals in urine to antibodies to foods in the blood.

She admits that’s an imperfect way to measure food allergies, since people can be sensitive to certain foods without having any problems when they eat. Of the 2,211 people included in the study, most had detectable levels of DCPs in their urine. About 400 showed sensitivity to at least one food, like peanuts, eggs, or milk. More than 1,000 people were sensitive to an environmental allergen, like ragweed or pet dander.

People with the highest levels of of the chemicals were nearly twice as likely to show sensitivity to at least one food compared to those with lowest levels of those chemicals. That remained true even after researchers adjusted their data to account for other factors, like race, age, and a diagnosis of allergies or asthma.

“For some reason, in our study, we found people who were sensitized to foods had the highest levels of dichlorophenols,” Jerschow says.

The study is published in the Annals of Allergy, Asthma, and Immunology.

More Research Needed

The study doesn’t prove that DCPs cause food allergies. It merely shows the two are related in some way.

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