Bones are living tissues that are constantly changing; some cells add calcium to bones, while other cells remove the mineral from bones. An adult human has 206 bones, while babies are born with 300 bones; throughout childhood, some bones fuse together as the body grows. Healthy and strong bones are vital for good health. People can take care of their skeletal systems by eating a diet rich in protein, vitamins, and minerals. Regular exercise is also crucial for strong bones. When you stress your bones through physical activity, the cells increase the rate of calcium addition, causing the bones to grow denser. More on Best Ways to keep Bones Healthy