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Role of vitamin d in insulin secretion and insulin sensitivity for glucose homeostasis.
MedLine Citation:
PMID:  20011094     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Vitamin D functions are not limited to skeletal health benefits and may extend to preservation of insulin secretion and insulin sensitivity. This review summarizes the literature related to potential vitamin D influences on glucose homeostasis and insulin sensitivity. Cross-sectional data provide some evidence that circulating 25-hydroxyvitamin D (25(OH)D) is inversely associated with insulin resistance, although direct measurements of insulin sensitivity are required for confirmation. Reported associations with insulin secretion, however, are contradictory. Available prospective studies support a protective influence of high 25(OH)D concentrations on type 2 diabetes mellitus risk. There is a general lack of consistency in vitamin D intervention outcomes on insulin secretion and sensitivity, likely due to differences in subject populations, length of interventions, and forms of vitamin D supplementation. Vitamin D receptor gene polymorphisms and vitamin D interactions with the insulin like growth factor system may further influence glucose homeostasis. The ambiguity of optimal vitamin D dosing regimens and optimal therapeutic concentrations of serum 25(OH)D limit available intervention studies. Future studies, including cross-sectional and prospective, should be performed in populations at high risk for both vitamin D deficiency and type 2 diabetes mellitus. Well-designed, placebo-controlled, randomized intervention studies are required to establish a true protective influence of vitamin D on glucose homeostasis.
Authors:
Jessica A Alvarez; Ambika Ashraf
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of endocrinology     Volume:  2010     ISSN:  1687-8345     ISO Abbreviation:  Int J Endocrinol     Publication Date:  2010  
Date Detail:
Created Date:  2009-12-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101516376     Medline TA:  Int J Endocrinol     Country:  Egypt    
Other Details:
Languages:  eng     Pagination:  351385     Citation Subset:  -    
Affiliation:
Department of Nutrition Sciences, University of Alabama at Birmingham, AL 35233, USA.
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