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New evidence that low vitamin D levels may lead to Parkinson's disease

  [ 63 votes ]   [ 1 Comment ] • July 14, 2010

“…Provides preliminary data supporting future interventional studies of the role of vitamin D in the pathogenesis of Parkinsons disease.”

A new study on vitamin D levels and Parkinson's disease risk points to the need for further research on whether vitamin D supplements can protect against the movement disorder,  according to an editorial in the July 2010 issue of Archives of Neurology. (“Beyond vitamin status: Is there a role for vitamin D in Parkinson Disease?")

The author of the editorial, Marian Evatt, MD, is assistant professor of neurology at Emory University School of Medicine and director of the Atlanta Veterans Affairs Medical Center's Movement Disorders Clinic. The study she refers to (“Serum vitamin D and the risk of Parkinson Disease”) is the first to show that low vitamin D levels can help predict whether someone will later develop Parkinson's disease.

The Finnish Tracking Study

Researchers at Finland's National Institute for Health and Welfare measured vitamin D levels from more than 3,000 people without Parkinson's disease, using blood samples taken between 1978 and 1980, and then followed those people to see whether they developed Parkinson's.

People with the lowest levels of vitamin D in ‘78-80 were three times more likely to have developed Parkinson's by 2007, compared to the group with the highest levels.

• Previous research had suggested a link between low vitamin D and Parkinson's, but whether this is a cause-and-effect relationship is unknown.

• Vitamin D may help protect the population of neurons gradually lost by people with Parkinson's disease, Evatt writes in her editorial.

Parkinson's disease affects nerve cells in several parts of the brain, particularly those that use the chemical messenger dopamine to control movement. The most common symptoms are tremor, stiffness and slowness of movement.

• These can be treated with oral replacement of dopamine.

• Research on animals suggests that vitamin D may protect neurons that produce dopamine from toxins.

• Besides vitamin D levels, factors such as genetics and exposure to pesticides also are associated with the risk for developing Parkinson's disease.

• And, according to a companion article in this issue of Archives of Neurology (“When does Parkinson disease start?”) there is convincing new evidence suggesting the preclinical period can extend 20 or more years before the onset of motor manifestations – with symptoms that can include constipation, anxiety, sleep disorder, anemia, and impaired sense of smell & depression.

Doctors have known for decades that vitamin D promotes calcium uptake and bone formation, but evidence is accumulating for additional roles regulating the immune system and the development of the nervous system.

Humans can get vitamin D from exposure to sunlight or eating foods such as fatty fish or fortified foods such as milk and packaged cereals.

• People living at high latitudes tend to have less exposure to the sun;

• In the Finnish study, the average vitamin D level was about half of the currently recommended level.

Vitamin D levels are usually measured by looking at the stable, 25-hydroxy form; the current recommended level is 30-40 nanograms per milliliter of blood. Evatt writes that public health authorities should consider raising the target vitamin D level above the current recommended target because of known benefits for bone health as well as potential benefits for the nervous system.

Still, animal data suggests that too much vitamin D can also be harmful for the nervous system, and megadoses of vitamin D can induce hypercalcemia, or an excess of calcium in the blood.

• "At this point, 30 ng/ml or more appears optimal for bone health in humans,” says Evatt.

• “However, researchers don't yet know what level is optimal for brain health or at what point vitamin D becomes toxic for humans, and this is a topic that deserves close examination."

Next Generation Studies Underway

At Emory, Evatt and colleagues are conducting two projects: a pilot clinical trial, which examines the effects of vitamin D supplementation on patients with Parkinson's disease who have low vitamin D levels, and further epidemiological (association) studies of vitamin D in Parkinson's disease. See the trial listing for the pilot -

Source: Emory University news release Jul 12, 20010

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Article Comments Post a Comment

Vitamin D Levels
Posted by: Dr. Tilden
Jul 31, 2010
The levels of Vitamin D you suggest as recommended are probably much too low: see Dr. John Cannell MD at the Vitamin D Council: His recommendations are much higher: •take 5,000 IU per day for 2–3 months, then obtain a 25-hydroxyvitamin D test. Adjust your dosage so that blood levels are between 50–80 ng/mL (or 125–200 nM/L) year-round. Please remember the range is 32 to 100; your recommendation of 30 to 40 begins at "sub-normal" levels. Also remmeber some people are not capable of absorbing Vitamin D from sunlight and need to take huge doses just to approach normal levels. Personally, I take almost 80k per week and over a two-year period have only begun to approach a decent level of 50. Please do your research as I have and reccomend appropriate levels to the consumers. Thanks very much, Dr. Tilden
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