Sun Exposure Doesn't Guarantee Adequate Vitamin D Levels
I just read a new study that contradicts what I have been reading from all other sources. These folks looked at Hawaiians and found that many of them who said they get plenty of sun still had low vitamin D levels.
http://jcem.endojournals.org/cgi/content/abstract/92/6/2130
http://jcem.endojournals.org/cgi/content/abstract/92/6/2130