I have heard much the same thing about magnesium...
I have never tried to track down the statistics that might support this assertion about milk consumption and osteoporsis...
I remember that as a child I did not drink much milk and never suffered any broken bones whereas a number of friends who had several glasses of milk a day were breaking bones with simple falls and I wondered about the milk-consumption/broken-bone it back then......
There are apparently different forms of the milk proteins, for example in the B type milk on sale these days, that is supposed to be more easily absorbed and more beneficial but I am not a big milk drinker (in my coffee only) and so never really looked at it much...
