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Food, Skin Allergies on the Rise Among Children

Reasons aren't known, but researchers found racial, age and income differences
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WebMD News from HealthDay

By Steven Reinberg

HealthDay Reporter

THURSDAY, May 2 (HealthDay News) -- The number of American children who suffer from food and skin allergies has increased dramatically in recent years, a new government report shows.

Interestingly, the prevalence of food and respiratory allergies rose with income: Children living in families that made more than 200 percent of the poverty level had the highest rates, the statistics showed.

"The prevalence of food and skin allergies both increased over the past 14 years," said report co-author LaJeana Howie, from the U.S. National Center for Health Statistics (NCHS), part of the U.S. Centers for Disease Control and Prevention. "This has been a consistent trend."

With food allergies, the overall rate went from 3.4 percent in 1997 to 5.1 percent in 2011. With skin allergies, the overall rate increased from 7.4 percent in 1997 to 12.5 percent in 2011. The prevalence of respiratory allergies remained constant, at 17 percent, between 1997 and 2011, although it remained the most common type of allergy affecting children, according to the NCHS report published May 2.

Pediatric allergists noted that they have been seeing the trend in their own practices.

Dr. Vivian Hernandez-Trujillo, director of allergy and immunology at Miami Children's Hospital, said: "We are certainly seeing increases in food and skin allergy in pediatric patients."

However, why these allergies are on the rise remains a mystery, another expert pointed out.

"We do not know why there has been an increase, but the theories include the 'hygiene hypothesis'; that reduced infection and reduced exposure to germs has left our immune systems 'looking for a fight' and attacking innocent proteins," explained Dr. Scott Sicherer, chief of the division of pediatric allergy and immunology at the Jaffe Food Allergy Institute at the Icahn School of Medicine at Mount Sinai in New York City.

In addition, there are theories about insufficient vitamin D, unhealthy fats in the diet, the obesity epidemic and processed food, none of which have been confirmed with hard science, he noted.

These increases are real, Sicherer added. "They speak to a need for more research toward prevention and cures," he said.

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