A low intake of vitamin C and alpha-carotene seems to be linked to an increased risk of childhood asthma. In a study of 4,093 children ages 6 to 17 years, researchers found that children who had a high intake of vitamin C were 26% less likely to develop asthma than those who took less than this, and that children had a lower risk of asthma when they took higher levels of alpha-carotene.
Am J Epidemiol 159:351-357, 2004
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