Our bodies need a balance of alkaline and acidity to function properly. Dairy is highly acidic which can force our body to take calcium from our bones to balance out the PH levels. When you consume dairy to feed your body calcium you may in fact be doing the opposite.
The Harvard Nurses Study was an investigation into osteoporosis and bone loss in women. From 1980 to 1992 the study followed 77,761 women between ages 34 and 59 to determine the relationship between milk consumption and osteoporosis.
“Those who drank three or more glasses of milk per day had no reduction in the risk of hip or arm fractures over the 12-year period, compared to women who drank little or no milk, even after adjustment for weight, menopausal status, smoking, and alcohol use. Fracture rates were higher for those who consumed three or more servings, compared to those who did not drink milk.”
Some info taken from: http://www.4alw.com