According to this regimen recommended by doctors and milk industry executives, women's bone mass would approach that of pre-historic dinosaurs. This line of reasoning should be equally extinct. Twenty-five million American women have osteoporosis. Drinking milk does not prevent osteoporosis. Milk contains calcium.
Bones contain calcium too.
When we are advised to add calcium to our diets we tend to drink milk or eat dairy foods. In order to absorb calcium, the body needs comparable amounts of another mineral element, magnesium. Milk and dairy products contain only small amounts of magnesium. Without the presence of magnesium, the body only absorbs 25 percent of the available dairy calcium content. The remainder of the calcium spells trouble.