Dietary factors associated with physician-diagnosed asthma and allergic rhinitis in teenagers: analyses of the first Nutrition and Health Survey in Taiwan

Background The occurrence of asthma and allergy are related to lifestyle fa ctors, and dietary pattern may be one of the contributing factors. Objective To examine the possible association between dietary intake and th e prevalence of asthma and allergic rhinitis in teenagers. Methods In a population-based cross-sectional survey, the relationship was sought between food frequency and physician-diagnosed asthma and allergic r hinitis in 1166 adolescents aged 13-17. Results The prevalence was 4.0% for asthma and 12.4% for rhinitis. Living i n an urbanized area was a significant predictor of asthma and rhinitis. In univariate analysis, higher frequencies of oily fish, butcher's meat, liver and deep-fried foods were associated with asthma. Relevant food frequency variables were dichotomized at the 75th percentile for multivariate logisti c regression analysis, which included adjustment for two levels of urbaniza tion. Asthma was associated with intakes of liver (OR = 2.32, 95%CI 1.11-4. 80), deep-fried foods (OR = 2.13, 95%CI 1.06-4.30) and butcher's meat (OR 1 .84, 95%CI 0.89-3.80). In a similar analysis, allergic rhinitis was associa ted with liver (OR = 1.67, 95%CI 1.06-2.63). No protective effect was demon strated for any of the food items examined. Conclusion Protein-rich and fat-rich foods of animal origin were associated with a higher prevalence of asthma in teenagers.