Vitamin D - Good for Teeth, Vital of Immune System
We've long understood the role Vitamin D plays in how our body absorbs calcium, keeping teeth and bones strong and healthy.  Most of what we need, our body makes when exposed to sunlight.  It is estimated that nearly half the world's population is deficient in Vitamin D, and the problem is worsening as we spend more time indoors.  Its thought that the Seattle area is particularly affected.

Now, we have one more good reason to be sure to get enough of this vital nutrient.  Scientists at the Copenhagen University have found that
our immune system, specifically immune cells called T-cells, can not function without Vitamin D.  T-cells, also called Killer Cells, remain dormant, and unable to fight disease causing bugs, if we have insufficient amounts of Vitamin D to activate them.

We get most of our Vitamin D from sunlight, but it is also in a few foods and in supplements.  There are no specific studies to support how much we need, but experts recommend 25 to 50 micrograms each day.

Very few foods in nature contain Vitamin D.  Fish such as salmon and tuna, and fish liver oil are the best sources.  Fortified foods, such as milk, provide the biggest edible source for us.