Calcium, essentially the most considerable mineral within the body, is found in some foods, added to others, out there as a dietary supplement, and current in some medicines (resembling antacids). Calcium is required for vascular contraction and vasodilation, muscle function, nerve transmission, intracellular signaling and hormonal secretion, although lower than 1% of complete body calcium is required to help these critical metabolic functions. Serum calcium may be very tightly regulated and does not fluctuate with changes in dietary intakes; the body uses bone tissue as a reservoir for, and supply of calcium, to take care of fixed concentrations of calcium in blood, muscle, and intercellular fluids.
The remaining 99% of the body’s calcium provide is stored within the bones and tooth the place it supports their structure and performance. Bone itself undergoes steady transforming, with fixed resorption and deposition of calcium into new bone. The balance between bone resorption and deposition changes with age. Bone formation exceeds resorption in periods of growth in youngsters and adolescents, whereas in early and middle adulthood both processes are relatively equal. In ageing adults, notably amongst postmenopausal women, bone breakdown exceeds formation, leading to bone loss that will increase the chance of osteoporosis over time
Sources of Calcium
Milk, yogurt, and cheese are rich natural sources of calcium and are the most important food contributors of this nutrient to individuals in america. Nondairy sources include vegetables, resembling Chinese language cabbage, kale, and broccoli. Spinach gives calcium, but its bioavailability is poor. Most grains do not need excessive amounts of calcium except they’re fortified; nonetheless, they contribute calcium to the food plan because they contain small amounts of calcium and folks consume them often. Meals fortified with calcium include many fruit juices and drinks, tofu, and cereals.
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