yes, genetics play a big role, that's why I decided on HRT as, at that time, in year 2000, my dr claimed it will protect me against Osteoporosis with all else just an experiment... As my grand mother spent her last five years in bed, for her bones were so badly broken after fall, I went for it.
Now I have Ostopenia.. Ok, it's not fully blown condition but I was shocked with this diagnosis. ..but, apparently, one in two women develop Osteoporosis...and one in five man..so ..we do not know how quickly it progress, nor if eating good stuff improves it at all...for they do not scan just to check..Most cases are diagnosed AFTER fractures!