The researchers gathered symptom prevalence data on types of food intake and symptom prevalence of asthma, rhinoconjunctivitis, wheezing, and eczema from 319,196 teens, ages 13 and 14, from 51 countries, and 181,631 children, ages 6 and 7, from 31 countries through the third phase of the International Study of asthma and Allergies in Childhood (ISAAC).
Fruit!
Fruit consumption at least once or twice a week was associated with a significant protective effect against the aforementioned conditions among children and teens.
Consumption of eggs, fruit, meat, and milk three or more times a week also showed a protective effect among the conditions.