Approximately 10 million Americans have osteoporosis. OP, as it is sometimes called, affects one in three women. Osteoporosis means that the bones have become porous. Putting it another way, the bones develop holes in them. Bone tissue is constantly subjected to processes that build up bone and processes that destroy it. When the processes that break down bone happen faster than the building-up processes occur, osteoporosis results. Most Americans know that calcium and vitamin D are essential...