Can Vitamin D Deficiency Cause Alzheimer's Disease?

"There are several risk factors for the development of Alzheimer's disease and vascular dementia. An increasing number of studies link these risk factors with vitamin D deficiency. Dr. William B. Grant of the Sunlight, Nutrition, and Health Research Center (SUNARC) suggests that further investigation of possible direct or indirect linkages between vitamin D and these dementias are needed."