Details

Autor(en) / Beteiligte

• Nwaru, Bright I.
• Hadkhale, Kishor
• Hämäläinen, Niina
• Takkinen, Hanna‐Mari
• Ahonen, Suvi
• Ilonen, Jorma
• Toppari, Jorma
• Niemelä, Onni
• Haapala, Anna‐Maija
• Veijola, Riitta
• Knip, Mikael
• Virtanen, Suvi M.

Titel

Vitamin D intake during the first 4 years and onset of asthma by age 5: A nested case‐control study

Ist Teil von

• Pediatric allergy and immunology, 2017-11, Vol.28 (7), p.641-648

Ort / Verlag

England: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Quelle

Access via Wiley Online Library

Beschreibungen/Notizen

• Background Early‐life vitamin D intake has been linked to asthma risk in childhood, but the role of longitudinal vitamin D exposure has not been previously evaluated. We investigated the association between vitamin D intake during the first 4 years of life and asthma risk by age 5. Methods Within a Finnish population‐based birth cohort, 182 incident asthma cases were matched to 728 controls on sex, genetic risk for type 1 diabetes, delivery hospital, and time of birth. Vitamin D intake was assessed by age‐specific 3 day food records. Parents completed a validated version of the International Study of Asthma and Allergies in Childhood questionnaire at 5 years. Results At 3 months, supplements were the main source of vitamin D intake; intake from foods increased from 3 months on, mainly from fortified milk products. Vitamin D intake at each specific age was associated with an increased risk of any asthma, atopic, and non‐atopic asthma, but only intake at 1 and 2 years was statistically significantly associated with asthma. Longitudinal vitamin D intake was associated with an increased risk of asthma (OR 1.24; 95%CI 1.00‐1.53). Conclusions Increased vitamin D intake in childhood, particularly intake at 1 and 2 years of age, may increase risk of childhood asthma. This might reflect a true effect or residual confounding by lifestyle or environmental factors. Repeated assessment of vitamin D intake allowed evaluation of the longitudinal and age‐dependent impact of vitamin D on the risk of asthma. Further longitudinal studies are required to confirm or question these findings.