It rarely occurs in healthy people but is a risk for older people or anyone who undereats.
Vitamin D, on the other hand, which is found in food and produced naturally by the body through the action of sunlight, is common around the globe.
In fact, one billion people are believed to have the deficiency, but the number is likely to grow in the winter when the sun is scarce.
Other deficiencies potentially involved in diabetes are zinc and chromium, which have multiple roles in insulin and glucose control. Further research, however, is needed to elucidate their role
