Many people don’t get enough vitamin D in their food. They still get enough vitamin D, because ultraviolet radiation radiation creates it—usually.
Why is it that the plucky Hobbit Bilbo Baggins triumph again and again over the likes of Gollum, the goblins, spiders, and Smaug? A cheeky medical paper suggests that good characters have an advantage over evil ones in Tolkien's world because good characters spend more time in the sun and absorb more Vitamin D.
Vitamin D could be a miracle worker, when it comes to treating some of the most common ailments that afflict Americans, such as depression and diabetes. But it could also cause some serious problems, if you get too much of it.
Vitamin D, produced when skin is exposed to light, is essential for our bodies. Unfortunately, modern lifestyles have minimized our time we spend under the sun. The Sun's Heartbeat explains why a tan isn't as bad as previously thought.