We've seen evidence that vitamin D deficiency is associated with sleep problems, particularly with daytime sleepiness. A new study examined the link between daytime sleepiness and vitamin D, and also considered one of the major risk factors of vitamin D deficiency: skin pigmentation.

While you probably know that the body produces vitamin D when exposed to sunlight, there are also other ways to get the crucial nutrient. However, ...

By Ella Quittner Vitamin D is essential for bone health. Recent research suggests it may have other benefits, too, such as protecting against col...

At this point, if you are someone who is interested in supplements and vitamins, you might be getting tired of hearing about all the extensive virtues of vitamin D.

There is a cultural myth that nutritional deficiencies are rare in Western countries. People always seemed shocked when I point out their symptom could be from a classic nutrient deficiency.

One of my patients recently brought in a mainstream magazine piece that cited an article from a medical journal regarding calcium increasing risk for heart attacks.

I'm going to diagnose myself as a sufferer of early onset seasonal affective disorder. Early onset as in early in the day. Several times this week I've had to stop myself from climbing into my pajamas at 7 p.m.

For years we've had it beat into our heads that because sunlight causes skin cancer, we should avoid the sun and, when in it, use sunscreen. Now we're getting more nuanced advice because of concerns about vitamin D deficiency.

It's looking very much like we're facing an epidemic of Vitamin D deficiency, with potential grave consequences.

Vitamin D deficiency is often missed because there are no real symptoms associated with it.

Studies have shown that optimizing vitamin D levels may help prevent as many as 16 different types of cancer. And the best way is through smart, limited sunscreen-free exposure to the sun.