The sun is the main source of vitamin D. But we don't get enough of it.
“The person that takes enough vitamin D3 has only one-fifth the risk of type 2 diabetes," says one of the study's coauthors, Cedric F. Garland, Ph.D. Dr. Garland goes on to say that almost 90% of the population does not have enough vitamin D to prevent diabetes and this is contributing to diabetes becoming a health epidemic.
He further says that your body makes vitamin D3 when you expose your skin to sunlight or take vitamin D in supplemental forms. So, diet is not the primary source of vitamin D.
An endocrinologist at Memorial Care Saddleback Medical Center in Laguna Hills, California, Rahil Bandukwala, DO, states he advises his patients take vitamin D supplements. However, he too believes that more research is needed to determine the link between vitamin D deficiency and type 2 diabetes risks.