Children with low levels of certain antioxidants may have an increased risk of developing asthma, according to a study published in the American Journal of Epidemiology (159, 4:351-7, 2004) (aje.oupjournals.org). The nationwide study (the Third National Health and Nutrition Examination Survey) measured the plasma levels of antioxidants, including vitamins A, C and E and carotenoids, of more than 4,000 children between the ages of 6 and 17 over six years.
Researchers found lower levels of vitamin C, alpha-carotene, beta-carotene and beta-cryptoxanthin to be associated with asthma. However, after adjusting for age, weight, parental asthma, socioeconomic variables and exposure to secondhand smoke, only low levels of vitamin C and alpha-carotene were significantly associated with asthma risk, according to the study.
Source: Natural Products Industry Insider.