Milk, we've been told, is a good source of calcium, provides protein, vitamins, and other nutrients. It's also becoming a source of controversy among parents, doctors, and scientists. We need calcium for bone health and while other foods, like spinach and broccoli, contain calcium milk has been thought to be an efficient vehicle for delivery. What the research tells us about milk is confusing at best. In fact, according to some studies, too much dairy can actually be harmful to our health.