Vitamin D Deficiency and Risk of Dementia

Vitamin D Deficiency and Risk of Dementia

Maintaining levels of vitamin D in the blood, in older people may help prevent dementia, Alzheimer's disease and stroke, according to a new study published in the bulletin Neurology January 5, 2010.

This study examined older people with vitamin D deficiency doubled the disease tends to dementia, Alzheimer's disease and stroke compared to those with adequate vitamin D.

In this study, Buell JS, researchers from the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University examined the relation between vitamin D, dementia, and cerebrovascular disease among 231 women and 109 men aged 65-99 who participated in the study since 2003 -2007.

23.9% of participants had developed dementia such as Alzheimer's, 14.5 percent with vitamin D deficiency, and 44.3 percent with vitamin D insufficiency in the blood.

Vitamin D deficiency is defined by the lack of serum 25-hydroxyvitamin D [25 (OH) D] below 10 ng/mL and vitamin D insufficiency is defined with vitamin D levels lower than 10 to 20 ng/mL in blood.

After adjustment for age, race, gender, body mass index, and education, vitamin D deficiency is associated with an increased risk of 130 percent of all causes of dementia, 15 percent increased risk for Alzheimer's and a 100 percent increased risk of stroke.

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