Methods: We conducted a transversal, descriptive, observational study to patients affiliated to Allergy department, in a third level Hospital "Dr. Antonio Fraga Mouret, "Mexico City. We included 100 patients (69 men and 31 women) from 3 to 18 years with rhinitis and asthma. We divide them in three age groups: 3 to 5 ; 6 to 10 ; and 11 to 18 years. We made to each one medical record , skin prick tests to aeroallergens and food.
Results: The average age of patients was 9.05 years, 69% were men. The most common aeroallergens were dust mite, ash tree, cat, oak tree, rye grass and tumbleweed. In this study we found positive skin test to food antigens in 45%. The average food was 3.1 per patient. The group that showed a higher percentage of food sensitization was 6 to 10 years (24%) predominantly soybeans, egg, shrimp, chicken, tuna and pumpkin, the second group was the 11-18 years ( 16%) positive for beans, gilthead sea bream, shrimp, red snapper, sea bass; and children under 5 years finding soybeans, egg and peanuts in 5% .
Conclusions: Food sensitization in patients with allergic rhinitis and asthma is common in the Mexican population, the most frequently identified were soy foods, egg, shrimp; which predominated in all age groups. Peanuts , egg , soy beans shows importance in children under 5 years and the fish meat, shirmp in adolescents.
Key words: Mexico, allergen, food allergy, allergic rhinitis, asthma.