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Calcium is the chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust. Calcium is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.

Calcium is essential for strong bones and teeth. Calcium deficiency can lead to disorders like osteoporosis (brittle bones). Good sources of calcium include dairy foods and calcium-fortified products, such as soymilk and breakfast cereals. Calcium is especially important for young children, teenagers and older women.

The average adult’s weight is made up of about two per cent calcium. Most of this is found in the skeleton and teeth – the rest is stored in the tissues or blood. Calcium is vital for healthy teeth and bones. It also plays a crucial role in other systems of the body, such as the health and functioning of nerves and muscle tissue. 

Good sources of calcium include dairy foods and calcium-fortified products, such as soymilk and breakfast cereals. People at different life stages need different amounts of calcium – young children, teenagers and older women all have greater than average requirements.

According to the most recent Australian Nutrition Survey data published in 1995, about 90 per cent of women and 70 per cent of children do not achieve the recommended dietary intake (RDI) for calcium. It is much better to get calcium from foods than from calcium supplements. Be guided by your doctor about whether you need additional supplements. Too much calcium (2,000 mg or more) from supplements may cause other health problems.

The role of calcium
Calcium plays a role in:strengthening bones and teeth
regulating muscle functioning, such as contraction and relaxation
regulating heart functioning
blood clotting
transmission of nervous system messages
enzyme function

Calcium and dairy food
Australians receive most of their calcium from dairy foods. If milk is removed from the diet, it can lead to an inadequate intake of calcium. This is of particular concern for children and adolescents, who have high calcium needs. Calcium deficiency may lead to disorders like osteoporosis (a disease of both men and women in which bones become fragile and brittle later in life). 

Too little calcium can weaken bones
If the body notices that not enough calcium is circulating in the blood, it will use hormones to reduce the amount put out by the kidneys in the urine. If not enough calcium is absorbed through the gastrointestinal tract, calcium will be taken from the bones. 

If your dietary intake of calcium is constantly low, your body will eventually remove so much calcium from the skeleton that your bones will become weak and brittle.

Calcium needs vary throughout life
The recommended dietary intake of calcium is different for people of different ages and life stages, including:

Babies 0–6 months approx.  - 210 mg (if breastfed)approx- . 350 mg (if bottle fed)
Babies 7–12 months  -  270 mg
Children 1–3 years     - 500 mg
Children 4–8 years     - 700 mg
Children 9–11 years   - 1,000 mg
Adolescents 12–18 years (including pregnant and breastfeeding young women)     -  1,300 mg
Women 19–50 (including pregnant and breastfeeding women)                                 -  1,000 mg
Women 51–70            - 1,300 mg
Men 19–70                  - 1,000 mg
Adults over 70             - 1,300 mg

Calcium Food Sources

Food                                                                                       Amount                            Calcium (milligrams)
Yogurt, plain, low fat                                                                 8 oz                                       415
Collards, frozen, boiled                                                            1 cup                                      357
Skim milk                                                                                  1 cup                                      306
Yogurt, plain, whole milk                                                           8 oz                                        275
Black-eyed peas, boiled                                                           1 cup                                      211
Canned salmon                                                                        3 oz                                        181
Calcium-set tofu                                                                       3 oz (¼ block)                        163
Cheese food, pasteurized American                                       1 oz                                        162
Trail mix (nuts, seeds, chocolate chips)                                  1 cup                                      159
Baked beans, canned                                                               1 cup                                      154
Cottage cheese, 1% milk fat                                                     1 cup                                      138
Iceberg lettuce                                                                           1 head                                      97
Green peas, boiled                                                                    1 cup                                        94
Soy milk                                                                                     1 cup                                        93
Oranges                                                                                     1 cup                                        72
Almonds                                                                                     1 oz (24 nuts)                           70 

Read More at Wikipedia

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