Bone disease can cause pain, deformity, and mobility issues if left untreated. It is often called a "silent" condition since many people are unaware they have it until suffering a fracture. Calcium and vitamin D are essential for building and maintaining strong bones. Good sources of calcium include dairy products, dark leafy greens, fish, nuts, beans, and fortified foods. Adults need 1000-1200 mg of calcium and 600-800 IU of vitamin D daily depending on age and gender. While foods should be the primary source, supplements may be needed to meet calcium requirements with a doctor's approval.