From the Mayo Clinic: http://www.mayoclinic.com/health/osteoporosis/DS00128/DSECTION=prevention
Getting adequate calcium and vitamin D is an important factor in reducing your risk of osteoporosis. If you already have osteoporosis, getting adequate calcium and vitamin D, as well as taking other measures, can help prevent your bones from becoming weaker. In some cases you may even be able to replace bone you've lost.
The amount of calcium you need to stay healthy changes over your lifetime. Your body's demand for calcium is greatest during childhood and adolescence, when your skeleton is growing rapidly, and during pregnancy and breast-feeding. Postmenopausal women and older men also need to consume more calcium. As you age, your body becomes less efficient at absorbing calcium, and you're more likely to take medications that interfere with calcium absorption.
How much calcium and vitamin D?
Premenopausal women and postmenopausal women who use HT should consume at least 1,000 milligrams (mg) of elemental calcium and a minimum of 800 international units (IU) of vitamin D every day. Postmenopausal women not using HT, anyone at risk of steroid-induced osteoporosis, and all men and women older than 65 should aim for 1,500 mg of elemental calcium and at least 800 IU of vitamin D daily.
Getting enough vitamin D is just as important as getting adequate amounts of calcium. Not only does vitamin D improve bone health by helping calcium absorption, but it also may improve muscle strength. Scientists are continuing to study vitamin D - which may also protect against certain types of cancer - to determine the optimal daily dose, but it's safe to take up to 2,000 IU a day.
Although many people get adequate amounts of vitamin D from sunlight, this may not be a good source if you live in high latitudes, if you're housebound, or if you regularly use sunscreen or you avoid the sun entirely because of the risk of skin cancer. Although vitamin D is present in oily fish such as tuna and sardines and in egg yolks, you probably don't eat these on a daily basis. Calcium supplements with added vitamin D are a good alternative.
As for calcium, dairy products are one, but by no means the only, source. Almonds, broccoli, cooked kale, canned salmon with the bones, oats and soy products such as tofu also are rich in calcium. If you find it difficult to get enough calcium from your diet, consider calcium supplements. Supplements are inexpensive and generally are well tolerated and well absorbed if taken properly. Sometimes calcium supplements can cause constipation. If this is a problem for you, drink more water and try using a fiber supplement. In addition, check the type of calcium you're using. Calcium phosphate and calcium citrate tend to be less constipating.
Calcium and vitamin D supplements are most effective taken together in divided doses with food.
Other tips for prevention
These measures also may help you prevent bone loss:
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