i believe there was one awhile back. Although I can’t remember what it was about. Thanks for the post. Now that I live in the California sunshine I get massive amounts of D. However my doctor was concerned I got 95% from D and very little from nutritional sources. So she gave me a D supplement. It is always good to test to make sure one is getting amount D. Especially considering the impact if one does not.
Correction.
Probably a dozen just from me. ;-)
Now that I live in the California sunshine I get massive amounts of D.
Last year I would have agreed with that but not now.
From the NIH with my comment at the end:
"Sun exposure Most people meet their vitamin D needs through exposure to sunlight [5,31]. Ultraviolet (UV) B radiation with a wavelength of 290-315 nanometers penetrates uncovered skin and converts cutaneous 7-dehydrocholesterol to previtamin D3, which in turn becomes vitamin D3 [9,32,33]. Season, geographic latitude, time of day, cloud cover, smog, skin melanin content, and sunscreen are among the factors that affect UV radiation exposure and vitamin D synthesis [33]. The UV energy above 42 degrees north latitude (a line approximately between the northern border of California and Boston) is insufficient for cutaneous vitamin D synthesis from November through February [5]; in far northern latitudes, this reduced intensity lasts for up to 6 months. In the United States, latitudes below 34 degrees north (a line between Los Angeles and Columbia, South Carolina) allow for cutaneous production of vitamin D throughout the year [27]."
http://ods.od.nih.gov/factsheets/vitamind.asp
This requires some thought. Even in the southern states there must be some months when little vitamin D can be made from sunlight.