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Related Experiment Videos

Calcium and osteoporosis

B E Nordin1

  • 1Division of Clinical Biochemistry, Institute of Medical and Veterinary Science, Adelaide, South Australia.

Nutrition (Burbank, Los Angeles County, Calif.)
|July 1, 1997
PubMed
Summary
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Calcium is vital for bone health, and deficiency can lead to osteoporosis. Adequate calcium intake, especially post-menopause, is crucial for preventing bone loss and fractures, though vitamin D is also important.

Area of Science:

  • Nutritional Science
  • Endocrinology
  • Gerontology

Background:

  • Calcium is essential for metabolic processes and provides skeletal rigidity, with 99% stored in bones and teeth.
  • Calcium deficiency can impair growth, cause rickets (often linked to vitamin D deficiency), and lead to osteoporosis in adults by mobilizing bone.
  • Osteoporosis, a reduction in bone density, is common with aging, particularly after menopause in women and around age 55 in men, increasing fracture risk.

Purpose of the Study:

  • To investigate the relationship between calcium intake and bone density in aging adults.
  • To determine if calcium intake influences peak bone density and the rate of bone loss.
  • To evaluate the role of calcium in preventing age-related bone loss and fractures, especially in postmenopausal women.

Main Methods:

Related Experiment Videos

  • Analysis of calcium balance studies to determine mean calcium requirements and recommended allowances for various age groups and physiological states.
  • Review of 20 major calcium trials in postmenopausal women to assess the effect of calcium therapy on bone loss rates.
  • Comparison of calcium therapy with estrogen therapy in preventing bone loss.

Main Results:

  • The mean calcium requirement for adults on Western diets is approximately 800 mg/day, with a recommended allowance of 1000 mg/day.
  • Calcium therapy in postmenopausal women significantly reduced the rate of bone loss compared to controls (0.014% p.a. vs. 1.00% p.a.).
  • Estrogen therapy was generally more effective than calcium in preserving or increasing bone density, suggesting a dual action on calcium metabolism and bone resorption.

Conclusions:

  • Adequate calcium intake is essential for maintaining bone health and preventing osteoporosis, with higher recommendations for postmenopausal women.
  • While calcium therapy can slow bone loss, estrogen may be more effective due to its broader effects on calcium regulation and bone metabolism.
  • Vitamin D insufficiency is strongly associated with hip fractures in older women, highlighting its critical role alongside calcium in bone health.