Mineral is a substance that the body needs in order to carry out bodily functions, like thinking, breathing and moving around. An important, and that our body needs the most is calcium. Calcium is a major part of the bones, and this is where the body structure stores it's calcium. It is very important to make sure you eat calcium each day because if you dont eat enough, your body will take the calcium it needs from you bones. The less calcium your bone has stord, the weaker you get.