Vitamin - D, popularly known as the ‘Sunshine Vitamin’ has been linked to many diseases in the recent past. One such strong link has been proved with diabetes too!
Chronic deficiency of vitamin - D may be linked to the onset / worsening of type 2 diabetes; and there is a science behind it to support this fact. No matter, how much calcium you consume through diet, it fails to get absorbed in the body, in the absence/deficiency of vitamin D. Biologically, calcium ions are known to trigger insulin release. So, failure of calcium absorption might not just weaken your bones, but can also slow down the insulin secretion, thus leading to the onset / worsening of diabetes.
To conclude, keep your vitamin - D checked periodically to manage the blood sugars effectively!