When we think of our bones, we don't normally recognize that they are our very foundation: a living mass of tissue that supports our frames and keeps us healthy and spry. Unfortunately, the loss of calcium in the body over time wears away at our foundations, which is why it's important to make sure we're constantly being fed with reinforcing nutrients. But while calcium is the basic rudiment of our bones, bones also need Vitamin D in order to stay strong. In fact, without Vitamin D, your body can't even absorb calcium. Getting a good amount of sunlight (which helps your skin generate Vitamin D) and drinking milk are two simple ways to make sure you're on your way to sustained bone health.