Skip to content
My WebMD Sign In, Sign Up

Heart Disease Health Center

Font Size

Low Vitamin D Levels May Raise Heart Risk

Study Shows Vitamin D Supplements May Be Useful in Preventing Heart Disease
By
WebMD Health News
Reviewed by Louise Chang, MD

Nov. 16, 2009 (Orlando, Fla.) -- Some men with low levels of vitamin D in their blood are at particularly high risk of developing heart disease and weakened bones that can lead to osteoporosis, researchers report.

In a study of more than 1,000 men, those with low levels of both vitamin D and the sex hormone estrogen were at significantly increased risk of having cardiovascular disease, says study head Erin Michos, MD, a cardiologist at Johns Hopkins.

"They were also at dramatically increased risk of osteopenia," or bone loss that can lead to osteoporosis, she says.

"Our results suggest that vitamin D supplements, which are already prescribed to treat osteoporosis, may also be useful in preventing heart disease," Michos tells WebMD.

Men with low levels of vitamin D and testosterone, on the other hand, were not at heightened risk for heart disease or osteopenia.

Role of Estrogen and Vitamin D

The new findings build on previous studies showing that low levels of vitamin D and estrogen, a sex hormone found in differing amounts in men and women, are independent risk factors for developing plaque-laden arteries and weakened bones.

The new study confirmed that men who had low levels of estrogen were at increased risk of both heart disease and osteopenia.

And if both estrogen and vitamin D levels were depressed, the men's rates of heart and bone disease were even higher, Michos says.

Michos and colleagues now plan to analyze blood samples from women to see if the same results hold true for them. Studies are also under way to determine whether vitamin D supplements can cut the risk of heart attack, stroke, and osteoporosis.

The findings were presented at the annual meeting of the American Heart Association (AHA).

How to Get Enough Vitamin D

Previous research showed that 41% of men and 53% percent of women are deficient, with vitamin D levels below 28 nanograms per milliliter, Michos says.

The Institute of Medicine suggests that an adequate daily intake of vitamin D is between 200 and 400 international units for children and adults up to age 70. But Michos feels this is inadequate to achieve optimal nutrient blood levels.

Michos recommends that men and women boost their vitamin D levels by eating diets rich in fatty fish, such as cod, sardines, and mackerel. She also suggests consuming fortified dairy products, taking vitamin supplements, and briefly exposing skin to the sun's vitamin-D-producing ultraviolet light.
AHA spokeswoman Alice Lichtenstein, DSc, a nutritionist at Tufts University, says the new studies add to growing evidence suggesting a link between vitamin D insufficiency and cardiovascular disease.

But until well-designed studies show that vitamin D can improve heart health, people should refrain from taking mega-supplements on their own, she says.

"People sometimes think if a little is good, a lot is better. But that's not always true. Too much vitamin D can build up and be toxic to organs like the kidney," Lichtenstein says.

Today on WebMD

x-ray of human heart
A visual guide.
atrial fibrillation
Symptoms and causes.
 
heart rate graph
10 things to never do.
Compressed heart
Article
 
empty football helmet
Article
red wine
Video
 
eating blueberries
Article
Simple Steps to Lower Cholesterol
Slideshow
 
Inside A Heart Attack
SLIDESHOW
Omega 3 Sources
SLIDESHOW
 
Salt Shockers
SLIDESHOW
lowering blood pressure
SLIDESHOW