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  • Title: Association between obesity and asthma in a twin cohort.
    Author: Thomsen SF, Ulrik CS, Kyvik KO, Sørensen TI, Posthuma D, Skadhauge LR, Steffensen I, Backer V.
    Journal: Allergy; 2007 Oct; 62(10):1199-204. PubMed ID: 17845591.
    Abstract:
    BACKGROUND: Obesity is linked to asthma in a yet poorly understood manner. We examined the relationship between obesity and asthma in a population-based sample of twins. METHODS: From the cohorts born between 1953 and 1982, who were enrolled in The Danish Twin Registry, a total of 29 183 twin individuals participated in a nationwide questionnaire study, where data on height, weight and asthma were collected. Latent factor models of genetic and environmental effects were fitted using maximum likelihood methods. RESULTS: The age-adjusted risk of asthma was increased both in obese females, OR = 1.96 (1.45-2.64), P < or = 0.001 and in obese males, OR = 1.59 (1.08-2.33), P = 0.02. According to best-fitting models, the heritability for obesity was 81% in males and 92% in females, whereas the heritability for asthma was 78% and 68% in males and females respectively. The age-adjusted genetic liabilities to obesity and asthma were significantly correlated only in females, r = 0.28 (0.16-0.38). CONCLUSIONS: Obese subjects have an increased risk for asthma, which in females seems partly because of common genes.
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