Pregnancy diet and offspring asthma risk over a 10-year period: the Lifeways Cross Generation Cohort Study, Ireland.
BMJ Open. 2018 Feb 20;8(2):e017013. doi: 10.1136/bmjopen-2017-017013.
Viljoen K1, Segurado R1,2, O'Brien J1, Murrin C1, Mehegan J1, Kelleher CC1; DMed on behalf of the Lifeways Cross Generation Cohort Study Steering Group.
- Risk of infant Asthma cut in half if mother supplemented Vitamin D to get more than 30 ng – RCT Oct 2017
- Childhood asthma problems eliminated for months by 600,000 IU of Vitamin D – June 2017
- Asthma in 3 year olds decreased somewhat with 4,000 IU during pregnancy – RCT Jan 2016
- Pregnant women with low vitamin D (e.g. asthmatics) were more likely to have infants with vitamin D problems (asthmatics) – Jan 2018
- Reduction of infant asthma may require good vitamin D when lung development starts (4 weeks) – March 2017
Note: Unfortunately most Vitamin D intervention studies do not achieve a good level until the 20th week. The use of a loading dose at 4th week should work however
The association of maternal pregnancy diet with offspring asthma risk have been reported. However, literature on longitudinal patterns of asthma risk relative to intrauterine nutrient exposure is limited. We aimed to establish whether vegetable, oily fish and vitamin D intake during pregnancy are associated with childhood asthma risk over a 10-year period in the Irish Republic.
Mother-child pairs (n=897) from the Lifeways prospective birth cohort, with data on nutrient intake during pregnancy and asthma status, respectively, were eligible for inclusion in the analysis. Data on socioeconomic and morbidity indicators over 10 years of follow-up on mothers and the index child were collected through self-administered questionnaires. Asthma status as diagnosed by the general practitioner at any time point over 10 years was related to maternal vegetable, oily fish and vitamin D intake during pregnancy, while adjusting for gestational age, socioeconomic status, smoking at delivery, breast feeding, season of birth and supplement use. Data were modelled with a marginal model on correlated observations over time within individuals.
In the fully adjusted model, asthma was inversely associated with higher daily average intake of oily fish (OR 0.23 per serving/day, 95% CI 0.04 to 1.41) and of vegetables (OR 0.96 per serving/day, 95% CI 0.88 to 1.05), but the confidence limits overlapped 1. A higher daily vitamin D intake was associated with reduced odds of asthma (OR 0.93 per μg/day, 95% CI 0.89 to 0.98).
This analysis suggests higher daily average intake of vitamin D in pregnancy is associated with asthma risk in offspring over the first 10 years of life.
PMID: 29463584 DOI: 10.1136/bmjopen-2017-017013