Vitamin D: Vital Role in Your Health
Vitamin D deficiency can be harmful -- in fact, there are real benefits to increasing your Vitamin D.
Vitamins like C and E continue to be the darlings of many supplement lovers.
But those vitamin superstars are being forced to share their throne with the
long neglected vitamin D, which is finally getting the attention it may have
No doubt, you're probably familiar with the role of vitamin D in promoting
healthy bones, largely by promoting the absorption of calcium. "If you have
a vitamin D deficiency, particularly in your older years, it can lead to
osteoporosis or osteomalacia [bone softening]," says Lona Sandon, RD,
assistant professor of clinical nutrition at the University of Texas
Southwestern in Dallas.
But there is recent and mounting evidence that links low levels of the
vitamin to an increased risk of type 1 diabetes, muscle and bone pain, and,
perhaps more serious, cancers of the breast, colon, prostate, ovaries,
esophagus, and lymphatic system.
If you want to lower your blood pressure, vitamin D may be just what the
doctor ordered. If you're trying to reduce your risk of diabetes, or lower your
chances of heart attacks, rheumatoid arthritis, or multiple sclerosis, then
vitamin D should be at the front of the line in your daily supplement
D-fense for Your Health
As the research into vitamin D is accumulating, it's hard to know where the
accolades should start. "Activated vitamin D is one of the most potent
inhibitors of cancer cell growth," says Michael F. Holick, PhD, MD, who
heads the Vitamin D, Skin, and Bone Research Laboratory at Boston University
School of Medicine. "It also stimulates your pancreas to make insulin. It
regulates your immune system."
Just consider these recent studies:
- At Boston University, after people with high blood pressure were exposed to
UVA and UVB rays for three months, their vitamin D levels increased by more
than 100% -- and more impressively, their high blood pressure normalized.
"We've followed them now for nine months, and their hypertension continues
to be in remission," says Holick, professor of medicine, physiology and
biophysics at Boston University. One theory about how vitamin D reduces blood
pressure: It decreases the production of a hormone called renin, which is
believed to play a role in hypertension.
- In a study published in the Journal of the American Medical
Association in December 2003, of more than 3,000 veterans (ages 50 to 75)
at 13 Veterans Affairs medical centers, those who consumed more than 645 IU of
vitamin D a day along with more than 4 grams per day of cereal fiber had a 40%
reduction in their risk of developing precancerous colon polyps.
- In a report in the Journal of the American Geriatrics Society in
February 2004, researchers at the University of Basel in Switzerland showed
that elderly women who took a vitamin D supplement plus calcium for three
months reduced their risk of falling by 49% compared with consuming calcium
alone. Those women who had fallen repeatedly in the past seemed to gain the
most benefit from vitamin D.
- A study in the Jan. 13, 2004 issue of Neurology indicated that women
who get doses of vitamin D that are typically found in daily multivitamin
supplements -- of at least 400 international units -- are 40% less likely to
develop multiple sclerosis compared with those not taking over-the-counter