A couple years after I moved to Seattle I started noticing some odd aches and pains. After a coworker had similar issues, I went to the doctor, and they tested my Vitamin D levels. They were ridiculously low. They had me on a high initial dose, and than taking supplements ever since. I've heard the same story from tons of neighbors. Nowadays it's one of my first suggestions for new transplants. It's made a marked difference (along with a sunlamp).