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.
Low serum levels of 25-hydroxyvitamin 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.
For example, several studies have correlated tooth loss with development of cognitive impairment. There are two primary ways that people lose teeth: dental caries and periodontal disease. Both conditions are linked to low vitamin D levels.
Additionally, as reported by Reuters, low levels of vitamin D are also associated with the loss of cartilage in the knee joint of older individuals. Cartilage loss is the hallmark of osteoarthritis.
The researchers found that osteoarthritis patients with vitamin D sufficiency have approximately 1.5 percent less loss of knee cartilage per year than patients with vitamin D deficiency. The investigators measured the levels of vitamin D in blood samples, as well as the knee cartilage volume on X-rays, of nearly 900 men and women. The team then took similar measurements again almost three years later for about 350 of the study participants.
Overall, 58 percent of these subjects showed changes in knee cartilage indicating worsening osteoarthritis. But both at the beginning of the study enrollment and at follow up, men and women with vitamin D deficiency had lower knee cartilage volume and were more likely to experience knee pain.
|Vitamin D Dose Recommendations
||35 units per pound per day
|Age 5 - 10
|Age 18 - 30
There is no way to know if the above recommendations are correct. The ONLY way to know is to test your blood. You might need 4-5 times the amount recommended above. Ideally your blood level of 25 OH D should be 60ng/ml.