Nutrition: Calcium in Your Diet Download PDF, 1.42MB, PDF What is Calcium?Calcium is a mineral required for various body functions and strong bones. Adequate calcium intake is important to keep our bones healthy and help minimise the risk of osteoporosis.OsteoporosisIt is a medical condition of low bone mass that leads to weak bones and increased risks of fractures. Find out more about calcium sources, calcium absorption, and alternative calcium sources.