Studies about vitamin D and type 1 diabetes:

Glycemic Changes After Vitamin D Supplementation in Patients with Type 1 Diabetes Mellitus and Vitamin D Deficiency (2010)

Conclusion: Prospective study took 80 type-1 diabetic, vitamin D-deficient patients and had them take 4,000 IU vitamin D3 daily for 3 months to test vitamin D’s effect on blood sugar levels. There was a significant decrease in patient blood sugar levels among the entire group and those who achieved higher blood vitamin D levels enjoyed a greater decrease in blood sugar levels.


Significant Vitamin D Deficiency In Youth With Type 1 Diabetes Mellitus (2009)

Note: Article covering a variety of studies documenting that kids with type-1 diabetes have much higher rates of vitamin D deficiency compared to non-diabetic kids.


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.


Vitamin D and Diabetes (2005)

Note: Comprehensive article explaining how vitamin D deficiency contributes to diabetes.


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. 


Use of Cod Liver Oil During Pregnancy Associated with Lower Risk of Type 1 Diabetes in the Offspring (2000)

Conclusion: Norway study examining 85 type-1 diabetic subjects and 1,071 non-diabetic controls found that mothers supplementing with dietary vitamin D during pregnancy resulted in their offspring enjoying a lower risk for 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.


Worldwide Increase in Incidence of Type 1 Diabetes: The Analysis of the Data on Published Incidence Trends (1999)

Conclusion: Meta-analysis of 37 multi-year and multi-decade studies tracking type-1 diabetes rates in 27 different countries found that, overall, incidence rates of type-1 diabetes are increasing 3% world-wide. Could the trend towards more indoor lifestyles (with less sun exposure and vitamin D) be contributing to this?


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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