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Low vitamin D may double risk of fatal stroke - for whites only

  [ 6 votes ]   [ Discuss This Article ]
www.ProHealth.com • November 15, 2010


While vitamin D deficiency is associated with a doubling of fatal stroke among whites, it is not linked to more stroke deaths among blacks, according to research presented Nov 15 at the American Heart Association's Scientific Sessions 2010 (Abstract 9478).

Analyzing the health records of a nationally representative group of 7,981 black and white adults, researchers found that:

• Whites with deficient vitamin D levels had a doubled risk of dying from a stroke compared to whites with higher vitamin D levels.

• In contrast, researchers found no relationship between fatal strokes and vitamin D deficiency among blacks,

• Even though blacks in the study generally had a 60% higher risk of dying from stroke compared to whites

• And were much more likely to be D deficient. Nearly 7% of whites in the study were vitamin D deficient, compared to slightly over 32% of blacks.

Researchers are surprised because previous studies have indicated blacks are both more likely to have low levels of vitamin D and more likely to have strokes compared to whites.

The results held true after researchers accounted for various socioeconomic and stroke risk factors in both groups.

"We thought maybe the lower vitamin D levels might actually explain why blacks have higher risks for stroke," said lead researcher Erin Michos, MD, MHS, an assistant professor of medicine at Johns Hopkins University School of Medicine. "But we did not find the same relationship between vitamin D and stroke in blacks."

The study further shapes an emerging body of research about the potential health benefits of Vitamin D, a fat soluble vitamin involved in bone health that helps prevent rickets in children, protects against severe bone loss in adults, and potentially lowers the risks of heart disease, cancer, multiple sclerosis, diabetes and other medical conditions.

Sources of vitamin D include exposure to ultraviolet B rays in sunlight, eating fatty fish, egg yolks and fortified foods such as milk products and breakfast cereals, and vitamin D supplements.

Study Details and Implications 

Researchers, using data from the Third National Health and Nutrition Examination Survey of Americans (NHANES-III) conducted between 1988 and 1994, followed the study participants for a median of 14 years. They measured vitamin D amounts based on blood levels of 25-hydroxyvitamin D, a form that represents vitamin D stored in the body.

Average levels of vitamin D were significantly lower in blacks compared to whites. By 2006, according to the National Death Index, there were a total 176 deaths from fatal stroke (116 among whites and 60 among blacks).

Through regression analysis, researchers estimated the risks of fatal stroke based on low vitamin D blood levels lower than 15 ng/ml and race, eliminating the effects of socioeconomic status (including age, sex, income and education) and stroke health factors (including diabetes, high blood pressure, cholesterol, body mass index, smoking, physical activity and alcohol use).

Blacks may have a natural resistance to the negative effects of low vitamin D levels, which might also explain the lower frequency of bone fractures despite the higher prevalence of vitamin D deficiency among blacks, Michos said.

"Since stroke is the No. 3 cause of death in the United States, it's important for us to consider low vitamin D as a possible risk factor for stroke at least among whites," Michos said.

Clinical trials are needed to determine whether treating vitamin D deficiency will help lower stroke risks, she said.

• Researchers only had access to death records and thus couldn't account for stroke survivors, which potentially limits the study's reach.

• And since blood levels of vitamin D were only measured at the beginning of the study, this may not have been an accurate reflection of the participants' lifetime vitamin D status, Michos said.

___

Note: Other papers presented at the conference suggested links between low blood levels of vitamin D and prehypertension; reduced odds of survival from heart failure and heart attack; and greater risk of death from cardiovascular disease and other causes among post-menopausal women. (Abstracts 21058, 12680/P2074, and 10321.

Source: American Heart Association news release, Nov 14, 2010 with modifications.



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