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Insulin resistance correlated with low vitamin D levels in Arab Americans – June 2010

Serum 25-hydroxy vitamin d and insulin resistance, metabolic syndrome, and glucose intolerance among Arab Americans.

Diabetes Care. 2010 Jun;33(6):1373-5. Epub 2010 Mar 23.
Pinelli NR, Jaber LA, Brown MB, Herman WH.
Department of Pharmacy Practice, Wayne State University, Detroit, Michigan, USA.

OBJECTIVE: To describe 25-hydroxy vitamin D (25-OH-D) levels and examine associations between 25-OH-D levels and insulin resistance (IR), metabolic syndrome (MS), and glucose intolerance in Arab Americans.

RESEARCH DESIGN AND METHODS: Serum 25-OH-D levels were measured in a representative, cross-sectional sample of 542 Arab Americans with IR (46%), MS (33%), and glucose intolerance (42%).

RESULTS: Vitamin D insufficiency (5 to <20 ng/ml) was present in 75% and hypovitaminosis D (20 to <40 ng/ml) in 24% of participants. In men, 25-OH-D levels were lower in those with glucose intolerance than normoglycemia (P = 0.01).
No such difference was found in women. In men, 25-OH-D was negatively correlated with homeostasis model assessment of insulin resistance (r = -0.19; P = 0.0043), triglycerides (r = -0.18; P = 0.0069), fasting plasma glucose (r = -0.15; P = 0.027), and A1C (r = -0.14; P = 0.038). In women, 25-OH-D was positively correlated with HDL (r = 0.19; P = 0.0008).

CONCLUSIONS: Vitamin D insufficiency and hypovitaminosis D are extremely common among Arab Americans, and they are associated with IR, components of the MS, and glucose intolerance in men. PMID: 20332348

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