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Prediabetics not helped by 50,000 IU of vitamin D weekly and Calcium– Jan 2013

The effects of oral vitamin D on insulin resistance in pre-diabetic patients

Journal of Research in Medical Sciences, Vol 18, No 1 (2013)
Seyed A Hoseini, Ashraf Aminorroaya, Bijan Iraj, Massoud Amini

  • Seyed A Hoseini: Department of Internal Medicine and Endocrinology, Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  • Ashraf Aminorroaya: Department of Internal Medicine and Endocrinology, Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  • Bijan Iraj: Department of Internal Medicine and Endocrinology, Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  • Massoud Amini: Department of Internal Medicine and Endocrinology, Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Background: Some epidemiological and interventional studies have shown the role of vitamin D on insulin secretion and resistance. A previous study in our center showed that intramuscular vitamin D decreases insulin sensitivity in pre-diabetic patients. We investigated the role of oral vitamin D on the insulin sensitivity index and insulin resistance in pre-diabetic patients.

Methods: In a randomized clinical trial, we divided 45 people with pre-diabetes aged 47.4 ± 6.6 (range 33–61) years into three groups:

  • group A subjects treated with 50,000 IU oral vitamin D and 500 mg calcium carbonate (n = 21),
  • group B subjects treated with a single 300,000 IU intramuscular vitamin D and 500 mg calcium carbonate (n = 9), and
  • group C subjects treated with 500 mg calcium carbonate alone (n = 15).

Serum 25-hydroxyvitamin D [25(OH)D] was measured at baseline.
If it was less than 75 nmol/l, 50,000 IU vitamin D was given weekly, and if serum 25(OH)D was more than that, vitamin D was administered every 2 weeks.
Before and after 12 weeks of treatment, a 75-g glucose tolerance test was performed.
We used paired t-test and analysis of variance (ANOVA) to analyze the data. P values less than 0.05 were considered significant.

Results: Mean (SD) of serum vitamin D increased from 77.5 ± 39.2 to 118.8 ± 56.3 nmol/l (P = 0.009) in group A and from 80 ± 36 to 102.8 ± 43.3 nmol/l (P = 0.053) in group B, and decreased from 44.8 ± 18.3 to 34.6 ± 13.9 nmol/l (P = 0.06) in group C.
Insulin sensitivity index (Matsuda) decreased from 11.4 ± 3 to 9.9 ± 3.2 (P = 0.046) in group A, but in comparison with other groups, it was not significant.

Conclusion: Oral vitamin D had no effect on insulin sensitivity in pre-diabetes patients in 12 weeks treatment.
A randomized double-blind study with a longer duration of treatment is suggested to investigate the effect of vitamin D on insulin resistance.


See also VitaminDWiki

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