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Food Allergies Linked to Asthma Risk

Study Also Shows Children Are at Greater Risk for Food Allergies Than Adults
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WebMD Health News
Reviewed by Laura J. Martin, MD

Oct. 20, 2010 -- About three of every 100 people in the U.S. have at least one food allergy, and the presence of a food allergy may raise their risk of asthma, a study shows.

The study, which appears in the October issue of Journal of Allergy and Clinical Immunology, is the largest to offer a national snapshot of food allergy prevalence.

Children are at greater risk for food allergy than adults, and black male children are particularly at risk, the study shows.

"This gives us a good perspective, and the prevalence number is pretty solid," says study researcher Andy Liu, MD, an allergist at National Jewish Health in Denver.

Food allergies are on most everyone's radar screen these days with growing numbers of schools calling themselves "peanut-aware" or "peanut-free" and parents routinely asked to provide information on their child's food allergies.

Food Allergies on the Rise?

Researchers are not sure if there has been an actual rise in food allergies because they lack background data.

"There has been some suggestion that the rate of food allergy has been increasing, and it may be," Liu says. "There is certainly more awareness. And many of us, when think back to when we were in school, we didn't hear about food allergy."

Liu tells WebMD that when he was charged with bringing in snacks for his son's kindergarten class, he was stunned to learn that six of 28 kids had registered food allergies.

"Schools have moved to a position where they are taking food allergy seriously," he says. "Families were treated as pariahs before and were told to look for other school options if they had children with food allergies."

Researchers analyzed data on 8,203 people, ranging in age from 1 to older than 60, who completed the National Health and Nutrition Examination Survey in 2005-2006. Participants also had blood tests to confirm the presence of four food allergies: peanut, milk, egg, and shrimp. Among people with food allergy, 1.3% were allergic to peanuts, 0.4% were allergic to milk, 0.2% had and egg allergy, and 1% were allergic to shrimp, the study shows.

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