Osteoporosis is a bone disease that has been linked to a lack of calcium. Since dairy provides calcium and United States consumes so much dairy, you might think that we have the lowest rates of osteoporosis. According to one study, nations that consumed the most calcium also had the highest levels of hip fractures (USA having the most hip fractures) which are an indicator of osteoporosis. This goes exactly against what we are told – getting our calcium from dairy actually promotes weak bones. Of course the companies that sell dairy don’t tell us this information because they want us to buy their product.
There is reasoning for this misleading study. At one point I was worried about my calcium levels considering I don’t drink milk (I drink soy milk). It turns out I have no reason to worry. Dairy products actually create acidity in our bodies called metabolic acidosis. With this condition our body draws upon the most available acid buffer which is calcium. When the calcium is extracted, our bones are weakened. This means the consumption of dairy simply causes the need for us to consume more calcium. It’s a never ending cycle. For somebody who doesn’t consume dairy, they will never develop metabolic acidosis and their body won’t eat up all the calcium to start with. We’ve been told to drink milk for strong bones when in fact milk makes our body need more calcium.
Calcium absorption rates in food are 32% in milk and jump up to 50% in vegetables. It makes sense, then, that studies are showing those who eat the most fruits and vegetables have denser bones. Vitamin D is also important for calcium, considering it maintains and disturbs calcium throughout our bodies.

http://greenleanteen.com/?p=1507