A friend of mine pointed out an article in Reader's Digest
about Vitamin D which I read and you can read it online at
this url >
http://www.rd.com/content/openContent.do?contentId=28654
The article points out that the current RDA is inadequate and will
probably be increased to 1000 IU sometime in the future.
You may want to increase your daily intake of Vitamin D
especially after you read the article.
Brady