Follow-up from sfgate's resident physician-blogger at [1], more focused on what individuals can/should do and perceptions rather than research. Takeaways: skin tone affects vitD uptake, milk is insufficient, and lab tests report results against the average rather than against the recomended so a result of "normal" isn't enough. Also, fun fact: vitamin D has a huge impact on broken bones in the elderly... because it makes you not fall over in the first place!

[1] http://www.sfgate.com/cgi-bin/blogs/gurley/detail?entry_id=5...