Simply put, increase your protein intake, and it becomes necessary to dramatically increase your calcium intake. Unfortunately, such foods as dairy products are also very high in protein, negating the positive effects of their own calcium content. Because of this, te westernized world is trapped in a downward spiral of ever increasing incidence of such diseases as osteoporosis. Milk is not the answer to the problem. Milk is not the solution - it is part of the problem.
Most soy milks are also calcium-enriched, as are many orange juice brands.
All of these foods are great ways to supplement your body with calcium.