Science Daily (May 27, 2009)
There are several risk factors for the development of Alzheimers disease and vascular dementia. Based on an increasing number of studies linking these risk factors with Vitamin D deficiency, an article in the current issue of the Journal of Alzheimer's Disease (May 2009) by William B. Grant, PhD of the Sunlight, Nutrition, and Health Research Center (SUNARC) suggests that further investigation of possible direct or indirect linkages between Vitamin D and these dementia's is needed.
Low serum levels of Vitamin D have been associated with increased risk for cardiovascular diseases, diabetes mellitus, depression, dental caries, osteoporosis, and periodontal disease, all of which are either considered risk factors for dementia or have preceded incidence of dementia. In 2008, a number of studies reported that those with higher Vitamin D serum levels had greatly reduced risk of incidence or death from cardiovascular diseases.
Several studies have correlated tooth loss with development of cognitive impairment and Alzheimer's disease or vascular dementia.There are two primary ways that people lose teeth: dental caries and periodontal disease. Both conditions are linked to low vitamin D levels.
There is also laboratory evidence for the role of vitamin D inneuro-protection and reducing inflammation, and ample biological evidence to suggest an important role for vitamin D in brain development and function.
Given these supportive lines of evidence, Dr. Grant suggests that studies of incidence of dementia with respect to Vitamin D supplementation are warranted. In addition, since theelderly are generally vitamin D deficient and since vitamin D has somany health benefits, those over the age of 60 years should consider having their serum 25(OH)D tested, looking for a level of at least 30ng/mL but preferably over 40 ng/mL, and supplementing with 1000-2000IU/day of vitamin D3 or increased time in the sun during spring,summer, and fall if below those values.
To date, the evidence includes observational studies supporting a beneficial role of vitamin D in reducing the risk of diseases linked to dementia such as vascular and metabolic diseases, as well as an understanding of the role of vitamin D in reducing the riskof several mechanisms that lead to dementia.
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