Sodas and bone loss

I read somewhere that there is something in sodas that promotes the loss of calsium for bones. Why would that happen?

Carbonation and carbonic acid that have proven to eat away bone mass in studies, but that is just bone and carbonic acid, but in due time that will take a toll on your bones, it does cause loss of Ca2+ because of Acid that neutralizes it, Thas what I would think, Its simple chemistry behind it, Ca2+ being a metal is easily eaten away by acid, so even though your bones are not exposed to such high amounts of Carbonic acid, overtime it might slowly affect the bones.......

thats my 2 cents on the situation, hope this helps........caio