http://www.ncbi.nlm.nih.gov/pubmed/17023723"Intake of cola, but not of other carbonated soft drinks, is associated with low BMD
in women. Additional research is needed to confirm these findings."
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1380807/pdf/amjph00501-0134.pdfthis ones about older women. they found no evidence for moderate soda intake has any adverse effect on bone density in older women.
http://www.ncbi.nlm.nih.gov/pubmed/16702776interesting info for muscle training and bone strength
"Athletes competing in strength and power events, such as weight-lifting and jumping, have superior bone mass and structure compared with their untrained counterparts in all age groups. Exercise seems to be most effective during rapid growth, the average gain in bone mineral content (BMC) and density (BMD) in controlled trials being of the order of 2-5% per year. "
more info
http://www.ncbi.nlm.nih.gov/books/NBK45503/basic knowledge though....
"Calcium has been singled out as a major public health concern today because it is critically important to bone health and the average American consumes levels of calcium that are far below the amount recommended for optimal bone health.
Vitamin D is important for good bone health because it aids in the absorption and utilization of calcium. There is a high prevalence of vitamin D insufficiency in nursing home residents, hospitalized patients, and adults with hip fractures.
Physical activity is important for bone health throughout life. It helps to increase or preserve bone mass and to reduce the risk of falling. All types of physical activity can contribute to bone health, albeit in different ways."
http://www.ncbi.nlm.nih.gov/pubmed/9927006http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2811354/