Every few months, I pick one health issue that stands out from everything else. As I sit down and reflect on what I've learned from different seminars, journals and books that I've read, I realize that for 2005, that one issue has to be the role of vitamin D. Typically we think of vitamin D as vital for bone growth, but it has so many more uses. It plays a role in preventing high blood pressure, cardiovascular disease, diabetes, multiple sclerosis, cancer, arthritis, osteoporosis and...