How long have you been doing that? I just read an article that talked about this very thing and about how folks in the NW don't get enough sun and vit D and that there are a lot of illnesses that may be tied to this. I am very interested in this.
I have only read the first couple posts of this thread. But I have to comment on the part about your fear of having your info online.
There is no reason to worry.
It has already happened. I assure you that everything "private" about you is already online. Why people still even talk like it isn't is a mystery to me.