Studies about vitamin D and type 1 diabetes:

Vitamin D Supplementation in Early Childhood and Risk of Type 1 Diabetes: A Systematic Review and Meta-Analysis (2008)

Conclusion: A meta-analysis of five different studies investigating the link between vitamin D supplementation during infancy and early childhood and later development of type 1 diabetes found that children who take supplemental vitamin D are at a lower risk for type 1 diabetes. The meta-analysis involved 1,528 children with type 1 diabetes and 5,156 healthy controls.


The Association Between Ultraviolet B Irradiance, Vitamin D Status and Incidence Rates of Type 1 Diabetes in 51 regions Worldwide (2008)

Conclusion: Incidence rates of Type-1 diabetes are generally higher at latitudes farther away from the equator where there is less UVB radiation necessary for vitamin D production in humans. Type-1 diabetes incidences decrease in regions closer to the equator.


Intake of Vitamin D and Risk of Type 1 Diabetes: A Birth-Cohort Study (2001)

Conclusion: A 30-year Finland birth-cohort study involving 10,366 children found that those who regularly took supplemental vitamin D had a lower risk of developing type 1 diabetes. 


Vitamin D Supplement in Early Childhood and Risk for Type I (Insulin-Dependent) Diabetes Mellitus (1999)

Conclusion: Vitamin D supplementation in infancy is associated with a decreased risk for developing Type 1 Diabetes.


Prevention of Autoimmune Diabetes in NOD Mice by 1,25 Dihydroxyvitamin D3 (1994)

Conclusion: This study found hormonally active vitamin D to be extremely effective for reducing the prevalence of type-1 diabetes among NOD mice, a type of lab mouse intentionally bred to develop diabetes.


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