Benefits of calcium
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Calcium and Bone Health Benefits
Calcium is essential for building and maintaining strong bones and teeth, with about 99% of the body’s calcium stored in the skeleton and teeth 78. Adequate calcium intake, especially when combined with vitamin D, helps reduce bone loss in peri- and postmenopausal women and can lower fracture risk in older women with low baseline calcium intake 518. Calcium fortification and supplementation have been shown to increase bone mineral density, particularly in children and postmenopausal women, though the benefit for fracture prevention in the general population is less clear 1910. Long-term calcium deficiency can lead to osteoporosis and increased fracture risk 78.
Calcium’s Role in Metabolism and Body Systems
Calcium is crucial for many body functions beyond bone health. It is involved in muscle contraction, nerve impulse transmission, blood clotting, heartbeat regulation, and fluid balance within cells 78. Calcium also plays a regulatory role in digestion and neurotransmitter secretion . Fortification of foods with calcium can improve overall metabolism and the functioning of body systems .
Cardiovascular Health and Blood Pressure
Calcium intake may help lower blood pressure, especially in young people, and is associated with a reduced risk of hypertensive disorders during pregnancy 165. Some studies suggest that calcium supplementation does not increase the risk of coronary heart disease or all-cause mortality in older adults 16. However, other research indicates that excessive calcium intake, particularly from supplements, may increase the risk of cardiovascular events such as myocardial infarction 2410. The relationship between calcium and cardiovascular health remains complex and may depend on individual risk factors and the source of calcium.
Calcium and Pregnancy
Adequate calcium intake during pregnancy is important for fetal growth and may reduce the risk of pre-eclampsia, especially in women with low baseline calcium intake or those at higher risk due to age, ethnicity, or high BMI 16. Sufficient calcium during pregnancy also supports healthy blood pressure in both mothers and their children .
Cancer and Other Health Outcomes
High calcium intake, particularly from dairy products, is strongly associated with a reduced risk of colorectal cancer and may offer some protection against breast cancer, though evidence is limited 158. There is also limited evidence that high calcium intake could increase the risk of prostate cancer 18. The effects of calcium on other diseases, such as type 2 diabetes and Parkinson’s disease, are not conclusive .
Calcium Fortification and Public Health
Calcium fortification of foods is an effective strategy to increase calcium intake in populations with low dietary calcium, leading to improvements in bone health and small increases in children’s height 39. Fortification programs can also result in significant cost savings by preventing hip fractures in older adults . However, the benefits of calcium supplementation in older adults remain controversial, and more high-quality studies are needed 910.
Risks and Considerations of Calcium Supplementation
While calcium is essential, excessive intake—especially from supplements—can lead to side effects such as kidney stones, gastrointestinal issues, and possibly increased cardiovascular risk 2410. Most benefits are seen when calcium is consumed through food sources rather than supplements 58. Calcium supplementation should be tailored to individual needs, considering both potential benefits and risks 210.
Conclusion
Calcium is vital for bone health, metabolic functions, and several body systems. It may help lower blood pressure and reduce the risk of certain cancers and pregnancy complications. However, the benefits of supplementation, especially in older adults, are less clear, and excessive intake can pose health risks. Ensuring adequate calcium intake through diet, particularly in at-risk groups, remains important for overall health.
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