Okay, that may sound a little cliché, but calcium is extremely important for your body. Calcium (found in milk and various other foods) is a mineral stored in bones and teeth, where it supports structure and hardness. What does that have to do with Osteoporosis? Osteoporosis is a disease of the bones. It occurs when your body loses too much bone, makes too little bone or both. As a result, bones become weak and can break from a minor fall or, in serious cases, even from simple actions (like coughing or bumping your elbow).