Can diet protect against asthma?

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What you eat might affect your risk of developing allergies or asthma, and possibly that of your kids, hints a new review of the medical evidence.

Researchers found zinc, vitamins A, D, and E, as well as fruits and vegetables, seemed to have a protective role, but they stress the data are too preliminary to draw any firm conclusions.

“The short answer is that it is too early to tell,” said Dr. Graham Devereux of the University of Aberdeen in the UK, who worked on the study.

As a result, pregnant women and parents should not change their diets solely for the purpose of protecting their kids from allergies, Devereux added in an e-mail to Reuters Health.

“Currently there is no evidence that changing diet makes any difference,” he said.

More than seven percent of adult Americans, and even more kids, have asthma, and the lung disease has been on the rise in recent decades for unknown reasons.

According to the U.S. Centers for Disease Control and Prevention, it now causes more than 13 million annual visits to emergency rooms and doctors’ offices.

Devereux and his colleagues, whose findings appear in the Journal of Allergy and Clinical Immunology, reviewed 62 recent studies that looked at diet and risk of allergy and asthma.

All studies were based on records of women’s diets and other observations, a much weaker design than clinical trials in which people are given supplements or foods to eat.

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