Milk puts holes in your bones? Prove it

Commenting on my May 25 letter, Eric Bart stated that I “did not provide one shred of evidence that anything [he] wrote about the cruelty of the dairy industry was incorrect”. 
With all due respect, Mr Bart, I never mentioned anything about animal cruelty in the dairy industry; all I did was mock the assertion that osteoporosis in humans can be caused by the drinking of animal milk.
Admittedly, I did not provide any evidence that osteoporosis can be reduced by the drinking of animal milk. However, I just took this as common sense.
Be that as it may, I challenge you, sir, to provide sound scientific evidence backed by the medical profession that osteoporosis in humans is caused by the drinking of animal milk.  
Paul  
Khon  Kaen