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People can make vitamin D when exposed to sunshine. But many people in North America never get enough sun to do that.
November 24, 2014 There's not enough evidence that screening the general public for vitamin D deficiency helps reduce the risk of disease, the U.S. Preventive Services Task Force says.
Disease susceptibility varies among ethnic groups, but medicine hasn't always recognized that.
November 20, 2013 By a standard test most African-Americans have low levels of vitamin D. But most African-Americans also have strong bones. It turns out that the problem is with the test, which was looking for a form of D more common in Caucasians. The variation is a result of human evolution.
October 28, 2013 These days teenagers shun milk and reach for the energy drinks. That doesn't bode well for their bones, since most of the adult skeleton is built between ages 9 and 14. Calcium and vitamin are crucial, but perhaps the most surprising ingredient for strong bones is exercise.
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If only it was as simple as popping a supplement and being set for life. But alas, no.
October 12, 2013 A review of clinical trials using vitamin D to build bone density in middle-aged women finds that it doesn't help. That may be because those women aren't generally low on calcium and that D helps the body absorb calcium in the gut only if it's seriously lacking. It may do more good in the elderly.
Spring has brought the stork and a baby who just might have a higher risk for multiple sclerosis later in life.
April 9, 2013 Babies born in London in May have less vitamin D and more of a certain type of immune cell in their blood than babies born at other times. Researchers say the differences might help explain why people born in the spring are more likely to get multiple sclerosis.
Reducing dietary salt and alcohol, exercising, not smoking and maintaining a healthy weight are other lifestyle tweaks known to help prevent or reduce high blood pressure, doctors say.
David McNew/Getty Images
April 1, 2013 In the ongoing debate about the possible benefits of vitamin D supplements, a study suggests that the vitamin might indeed play a role in mildly reducing high blood pressure. The study was small and looked at just African-Americans, but the authors say the findings warrant further research.
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For vitamin D supplements, more isn't necessarily better.
October 25, 2012 How much vitamin D is enough vitamin D? And when should you add supplements to the diet? Doctors still disagree on the specifics, but some studies suggest that more isn't always better.
Sorry the vitamin D didn't help.
October 2, 2012 Some lab studies suggested vitamin D supplements might enhance immunity. But a clinical test in New Zealand found that taking vitamin D didn't reduce the frequency or duration of colds for the people who took the supplements.
Researchers say more studies are needed to determine whether sick kids deficient in vitamin D should get a big dose in a supplement.
August 6, 2012 Researchers say vitamin D deficiency is common among kids who are very ill. They also found that kids without enough vitamin D were more likely to be in the hospital longer than other kids.
June 21, 2012 Our evolutionary history is inscribed on our very skin. The explanation for why diverse skin colors evolved over time makes not only for good anthropology, but also for applied knowledge that may help us keep intact our Vitamin D health.
A woman pours two tablets into her hand from a pill bottle.
June 12, 2012 The U.S. Preventive Services Task Force concluded in draft recommendations released Tuesday that taking vitamin D and 1,000 milligrams of calcium every day doesn't reduce the risk for bone fractures among postmenopausal women. So the group is taking steps to recommend that women refrain from taking the supplements for those purposes.
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November 30, 2010 In our first hour of Talk of the Nation, wikileaks, right or wrong? In our second hour, the economy continues to force many Americans to make difficult decisions, and a Q-and-A about Vitamin D.
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