Calcium as a dietary mineral
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Calcium as a Dietary Mineral: Essential Functions and Sources
Calcium is a vital dietary mineral, with about 99% of the body’s calcium stored in bones and teeth, providing structural strength and rigidity. The remaining calcium is found in soft tissues and body fluids, where it plays crucial roles in muscle contraction, nerve transmission, blood clotting, and various cellular processes. Calcium homeostasis is tightly regulated by hormones and involves the intestines, kidneys, and bones to maintain stable blood calcium levels 267.
Dietary Calcium and Bone Health
Importance for Bone Development and Maintenance
Adequate calcium intake is essential for bone growth during childhood and adolescence, helping individuals achieve peak bone mass and reducing the risk of osteoporosis later in life. Studies show that higher dietary calcium intake in children and adolescents is associated with greater bone mineral density (BMD), and those consuming more than 1000 mg daily have higher bone mineral content 26810. In adults, especially postmenopausal women and older men, sufficient calcium intake helps slow bone loss and maintain bone health, though the impact on fracture risk is less clear 16.
Dietary vs. Supplemental Calcium
Both dietary calcium and supplements can increase BMD slightly, but the effect is small and unlikely to significantly reduce fracture risk. Dietary calcium is generally preferred over supplements, as supplements may carry additional risks, such as increased chances of kidney stones and cardiovascular events in some populations 14.
Global Calcium Deficiency and Health Outcomes
Calcium deficiency is widespread globally, particularly in low- and middle-income countries, but also affects certain groups in high-income countries. Inadequate calcium intake is linked to poor bone health, increased risk of osteoporosis, and may also contribute to pregnancy complications, some cancers, and cardiovascular disease . Despite lower calcium intakes, some populations have lower rates of osteoporotic fractures, suggesting other dietary or lifestyle factors may play a role .
Dietary Sources and Bioavailability
The main sources of dietary calcium are milk and dairy products, which provide over 40% of intake in some populations. Other sources include fortified cereals, certain plant foods (like broccoli and soya beans), and some animal products. The bioavailability of calcium varies: it is high in dairy and some plant foods, but low in foods high in oxalic or phytic acid, such as spinach .
Calcium and Metabolic Health
Calcium intake has been associated with benefits beyond bone health. Higher dietary calcium may help lower blood pressure, improve cholesterol levels, and assist in weight management. These effects are thought to occur through mechanisms such as reduced fat absorption and improved lipid metabolism. However, results are sometimes inconsistent, and more research is needed to clarify these relationships 59.
Risks of Excess Calcium Intake
While adequate calcium is important, excessive intake—especially from supplements—can increase the risk of kidney stones, cardiovascular events, and other health issues. It is generally recommended to prioritize dietary sources and tailor supplementation to individual needs 478.
Conclusion
Calcium is an essential dietary mineral crucial for bone health, muscle and nerve function, and other physiological processes. Most people should aim to meet their calcium needs through diet, focusing on bioavailable sources like dairy and certain plant foods. While supplements can help those at risk of deficiency, they should be used cautiously due to potential health risks. Ensuring adequate calcium intake throughout life is important for maintaining bone health and may offer additional metabolic benefits 1234+6 MORE.
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