Did you know that calcium supplements do not work? I bet that is a news item to you. I studied in the "Better Bone and Balance" program that is part of the Oregon State University bone lab. They found that eating calcium has very little to do with building bones. Bone density is increased by impact exercises and not what you eat.
Look up the bone lab studies on the OSU website and you will find lots of up to date information on how you can stop osteoporosis in as little as 6 weeks.