The triggers and causes of asthma have long been topics of investigation by epidemiologists. The current concept of asthma and atopy is that the onset of the disease and its clinical course are determined by gene environment interactions; that is, those individuals who develop asthma are both genetically susceptible and receive appropriate environmental stimuli. One potential environmental factor that may relate to disease etiology is diet. This article will review the published evidence for the effects of dietary antioxidants on asthma incidence and disease control.