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The prevalence of childhood asthma has increased rapidly in China[1].In Shanghai,the prevalence has increased from 2.1%in 1990 to 10.2%in 2011 in 3-to 7-year-old children[2].Various environmental and lifestyle factors have been suspected of association with the increasing prevalence of asthma in childhood[3,4].Numerous studies have investigated possible associations between dietary
The prevalence of childhood asthma has increased rapidly in China [1] .In Shanghai, the prevalence has increased from 2.1% in 1990 to 10.2% in 2011 in 3-to 7-year-old children [2] .Various environmental and lifestyle factors have been suspected of association with the increasing prevalence of asthma in childhood [3,4]. Numerous studies have been possible some associations between dietary