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Research Clarifies Roles Of Calcium, Vitamin D, And Protein In Bone Health
Excerpts from a reported in "Science Daily"
Bones lose calcium as they age, making them vulnerable to osteoporosis and fractures. "We found that people who take just dietary calcium, or a combination of dietary calcium with supplements,
have better bone density than those who take supplements alone," explained Dr. Reina Armamento-Villareal of the Washington University School of Medicine, St. Louis, MO (conference abstract P696).
In separate presentations, researchers from the Netherlands report that vitamin D supplements reduce fracture risk only in the presence of additional calcium; a new study
finds vitamin D deficiency is widespread among European women...
Calcium's bone strengthening benefits don't accrue in isolation--vitamin D also promotes healthy bone mass by enhancing calcium absorption. Now, researchers from Belgium and the Netherlands
report that high dose vitamin D supplements taken for osteoporosis prevention and treatment need sufficient calcium to be effective (conference abstract OC21).
Dr. Steven Boonen of the Leuven University Center for Metabolic Bone Diseases, in Belgium, and colleagues from Brussels University and Amsterdam University in the Netherlands, followed up with a broad literature search addressing the role of both calcium and vitamin D protection against hip fracture risk. The investigation showed that even at 800 international units per day, vitamin D could not protect against hip fracture in the absence of additional calcium. "Our meta-analysis shows there are two requirements for vitamin D to be effective," Boonen said. "First, you need the appropriate dose of vitamin D, as indicated by Ferrari, et al., and second you have to combine that dose with calcium."
In a different study, Dr. Olivier Bruyere of the University of Liege, Belgium, and his colleagues showed that most post-menopausal women living in Europe may be deficient in vitamin D, putting them at elevated risk of bone loss and fractures (conference abstract P142SA). Experts suggest the body needs at least 50 to 80 nanamoles per liter of vitamin D in blood serum for optimal bone health.
Bruyere and his colleagues analyzed vitamin D levels in 8,532 European postmenopausal women. Among the women, nearly 80% had circulating vitamin D levels below the high end of the acceptable range. Roughly one third of the women had levels lower than 50 nanamoles per liter, suggesting they have a serious risk of osteoporotic fractures.
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