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Nutrients 2013, 5(9), 3551-3562; doi:10.3390/nu5093551
Review

Vitamin D Intake and Risk of Type 1 Diabetes: A Meta-Analysis of Observational Studies

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1 Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, 199 Renai Road, Suzhou 215123, China 2 DSM Nutritional Products, Human Nutrition and Health, No.1-3 Xinyuannanlu, Beijing 100027, China 3 DSM Nutritional Products, Research Center, 476 Libing Road, Shanghai 201203, China 4 Department of Labor Hygiene and Environmental Health, School of Public Health of Soochow University, 199 Renai Road, Suzhou 215123, China
* Author to whom correspondence should be addressed.
Received: 26 July 2013 / Revised: 21 August 2013 / Accepted: 22 August 2013 / Published: 12 September 2013
(This article belongs to the Special Issue Vitamin D and Human Health)
View Full-Text   |   Download PDF [193 KB, 23 September 2013; original version 12 September 2013]   |   Browse Figures
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Abstract

Vitamin D is suggested to have protective effects against type 1 diabetes. However, the results from observational studies have been inconsistent. We aimed to examine their association by conducting a meta-analysis of observational studies. Multiple databases were searched in June 2013 to identify relevant studies including both case-control and cohort studies. Either a fixed- or random-effects model was used to calculate the pooled risk estimate. We identified eight studies (two cohort studies and six case-control studies) on vitamin D intake during early life and three studies (two cohort studies and one case-control study) on maternal vitamin D intake during pregnancy. The pooled odds ratio for type 1 diabetes comparing vitamin D supplementation with non-supplementation during early life was 0.71 (95% confidence interval [CI], 0.51–0.98). Similar results were observed in the case-control subgroup analysis but not in the cohort subgroup analysis. The pooled odds ratio with maternal intake of vitamin D during pregnancy was 0.95 (95% CI, 0.66–1.36). In conclusion, vitamin D intake during early life may be associated with a reduced risk of type 1 diabetes. However, there was not enough evidence for an association between maternal intake of vitamin D and risk of type 1 diabetes in the offspring.
Keywords: vitamin D; type 1 diabetes; early life; pregnancy; meta-analysis vitamin D; type 1 diabetes; early life; pregnancy; meta-analysis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Dong, J.-Y.; Zhang, W.; Chen, J.J.; Zhang, Z.-L.; Han, S.-F.; Qin, L.-Q. Vitamin D Intake and Risk of Type 1 Diabetes: A Meta-Analysis of Observational Studies. Nutrients 2013, 5, 3551-3562.

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