By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – “An apple a day keeps the doctor away.” This is true for all of us but particularly true in pregnancy where an apple when pregnant could have an extra special effect.

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According to studies, when moms-to-be ate apples during pregnancy, their children had lower rates of asthma.

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This is important because more than 20 million Americans have asthma.

According to the research done in Holland, women who consumed the most apples during pregnancy, more than four a week, had children who were 37% less likely to have ever wheezed than children of mothers who had eaten the lowest number of apples during pregnancy.

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A balanced diet high in fruits and vegetables is crucial for you and it is no surprise the impact it can have on pregnancy.