Most of the body’s calcium is stored in the bones, and daily intake is essential to prevent calcium from being drawn from the skeleton, balancing out blood levels to meet everyday needs. Calcium requirements are highest in adolescence - during rapid bone growth - as well as during the post-menopausal period, when bone loss accelerates. Dairy is the richest source, but calcium is also found in other foods, such as calcium-set firm tofu, leafy greens, fortified plant milk and bone-in sardines.