Bad bones.Calcium and vitamin D vitamin D
Any of a group of fat-soluble alcohols important in calcium metabolism in animals to form strong bones and teeth and prevent rickets and osteoporosis. It is formed by ultraviolet radiation (sunlight) of sterols (see steroid) present in the skin. supplements failed to prevent broken bones This article or section has multiple issues:
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Please help [ improve the article] or discuss these issues on the talk page. in two studies of older women at high risk for fractures.
One study tested calcium (1,000 mg a day) and/or vitamin D (800 IU a day) or a placebo on more than 5,000 people (mostly women) aged 70 or older who had already suffered one bone fracture because of osteoporosis. The second study tested the same two supplements (but no placebo) on more than 3,300 women with at Feast one risk factor for hip fracture hip fracture Orthopedic surgery A femoral fracture which affects 1/6 white ♀–US during life Epidemiology 250,000/yr–US Specifics Proximal femur; 90+% femoral neck, intertrochanteric; 5-10% are subtrochanteric Risk factors Tall, thin ♀, (a previous fracture, low body weight, smoker smoker A person who smokes tobacco, almost always understood to be cigarettes Ratio of ♂:♀ smokers Philippines64/19, China61/7, Saudi Arabia53/2, Russia50/12 , family history of hip fracture, or "fair" or "poor" self-reported health).
After two years, both studies found no lower fracture rates among those who were given supplements than among those who were not. But by the end of the first year, only 50 to 60 percent of the participants were still taking their pills, which could help explain why the fracture rates were no different*
What to do: If your bones are over 70 and already weak enough to have broken once, taking extra calcium and vitamin D may not help prevent another fracture. Talk to your doctor about whether to take bone-strengthening drugs.
Until more studies are done, stick to the recommended levels of calcium (1,000 mg if you're under 50 and 1,200 mg if you're over 50) and vitamin D (400 IU if you're under 70 and 600 IU if you're over 70).
Lancet 365: 1599, 1621, 2005 BMJ BMJ n abbr (= British Medical Journal) → vom BMA herausgegebene Zeitschrift 330: 1003 2005.