Although environmental factors are related to asthma very little research exists on asthma and dietary patterns. Stanford researchers conducted a systematic review and meta-analysis of 31 studies on asthma and diet. While the analysis found no association between diet and asthma prevalence in adults or of maternal diet with child asthma or wheeze, 7 of the 10 studies analyzing the Mediterranean diet showed protective effects on child asthma and/or wheeze. This research suggests that the Mediterranean diet may prevent asthma or wheeze in children.
Journal of Asthma and Allergy. 2014 Aug 12;7:105-21 (Lv N et al.)