Studies have shown that vitamin D supplementation has the potential to improve mood, blood sugar control and blood pressure regulation.
Approximately one in 10 people in the United States has diabetes, and the incidence is projected to increase to one in four by 2050.3 Many Americans do not get enough vitamin D, and people with diabetes are at especially high risk for vitamin D insufficiency or deficiency. Reasons include limited intake of foods high in vitamin D, obesity (increased vitamin D stored in fat tissue, rather than in circulation), lack of sun exposure, genetic variations and the inflammatory state induced by the disease.
Vitamin D status is typically low in patients with chronic inflammatory states (e.g., autoimmune disease, diabetes, cancer). Studies have shown that vitamin D supplementation provided to diabetics can reduce inflammation, improve blood sugar control (by improving insulin receptor activity secondary to a reduced inflammatory state, and by increasing insulin secretion from the pancreas), and increase blood vitamin D levels into the desirable range.1,3
Previous studies have accomplished this by providing diabetics with a daily dosage of 4,000 IU of vitamin D over many months.2 A recent pilot study by Sue Penckofer, PhD, RN, et al., included 46 type 2 diabetic women (average age: 55 years). These women had diabetes for an average of eight years and also showed low blood levels of vitamin D (18 ng/ml). They were given a weekly dose (50,000 International Units) of vitamin D.
After six months, their vitamin D blood levels rose to an average level of 38 ng/ml, which is in the desirable range. There was also objective evidence of improved mood, as indicated by a 20-question depression symptom survey. Scores decreased from 26.8 at the beginning of the study (indicating moderate depression) to 12.2 at six months (indicating no depression.) The depression scale ranged from 0 to 60, with higher numbers indicating more symptoms of depression.
Blood pressure also improved, with average systolic pressure decreasing from 140.4 mm Hg to 132.5 mm Hg. There was also a small reduction in body weight, which dropped from an average of 226.1 pounds to 223.6 pounds.3
Vitamin D status is emerging as an important variable in diabetes management. Health practitioners treating diabetic patients, and those with metabolic syndrome, should routinely examine blood levels of vitamin D in these patients. If vitamin D levels are low, it would be prudent to provide these patients with sufficient vitamin D supplementation to achieve blood levels in the desirable range.
The desirable range for vitamin D (25-hydroxycholecalciferol) is reported to be above 35 ng/ml or 90 nmol/L.4 A daily dosage of 4,000 IU per day appears to be a safe and reasonable dosage to start with, according to previous studies. Clinical studies show that vitamin D supplementation in these cases has the potential to improve diabetic management by increasing insulin sensitivity, insulin secretion, reducing the inflammatory state associated with the diabetes, improving immune function, lowering blood pressure, and elevating mood, which may improve patient compliance with lifestyle recommendations and medication use.
- Sung CC, Liao MT, Lu KC, Wu CC. Role of vitamin D in insulin resistance: review article. J Biomed & Biotech, 2012; epub Sept. 3, 2012.
- Belanchia, AM, Tosh AK, Hillman LS and Peterson CA. Correcting vitamin D insufficiency improves insulin sensitivity in obese adolescents: a randomized controlled trial. Am J Clin Nutr, 2013 Apr;97(4):774-81.
- Penckofer S, et al. Vitamin D improves mood and blood pressure in women with diabetes. Presented at the American Diabetes Association's 73rd Scientific Sessions. Study conducted by the Loyola University Chicago Niehoff School of Nursing.
- Moyad MA. Vitamin D: a rapid review. Dermatology Nursing, 2009;21(1).
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