A recent meta-analysis study conducted on adults showed a reliable association between low intakes of calcium, vitamin D, or dairy intake and type-2 diabetees.

The new study published in British Journal of Nutrition states that Vitamin D improved insulin resistance in insulin-resistant women. Involving 81 South Asian women with insulin resistance living in New Zealand, aged between 23 and 68, were randomly assigned to receive either 100 micrograms (4,000 IU) of vitamin D3 or placebo daily for six months.

According to the researchers, at the end of the examination phase, women in the vitamin D group showed considerable improvements in both insulin sensitivity and resistance, furthermore decreasing the fasting insulin levels, compared to placebo.

Indicating the importance of increasing the daily intake of vitamin D, an apprehension regarding the less intake suggested by dietary had been highlighted. As known by Vitamin D council that the optimal blood level of vitamin D is at least 125 nmol/L (50 ng/mL), it is observed that the best results were seen in women who had blood levels of vitamin D in the range of 80 to 119 nanomoles per litre (nmol/L). However, most Americans have levels less than 30 ng/mL.

Improved insulin resistance was observed when the serum level reached at least 80 nmol/L, hence, "Further evidence for an increase in the recommended adequate levels", said the researcher.