It has been reported that higher plasma 25-hydroxyvitamin D is associated with lower risk of type 2 diabetes. However the results to date have been mixed and no adequate data based on a cohort are available for the high end of the normal range, above approximately 32 ng/ml or 80 nmol/L.
Original Source [2]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/plasma-25-hydroxyvitamin-d-concentration-and-risk-type-2-diabetes-and-pre-diabetes
[2] http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0193070&type=printable
[3] http://admin.indiaenvironmentportal.org.in/category/author/sue-k-park
[4] http://admin.indiaenvironmentportal.org.in/category/author/cedric-f-garland
[5] http://admin.indiaenvironmentportal.org.in/category/author/edward-d-gorham-et-al
[6] http://admin.indiaenvironmentportal.org.in/category/journal/plos-one
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diabetes
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nutrition
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/non-communicable-diseases
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research