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Osteoporosis and vitamin D.

B E Nordin1, H A Morris

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

Journal of Cellular Biochemistry
|May 1, 1992
PubMed
Summary

Bone density decreases with age, increasing fracture risk. Vitamin D supplementation, particularly in the elderly, can improve calcium absorption, slow bone loss, and reduce hip fracture rates.

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Area of Science:

  • Gerontology
  • Metabolic Bone Disease
  • Nutritional Science

Background:

  • Bone density naturally declines with age, particularly after menopause in women and around age 55 in men.
  • This decline, known as osteoporosis, weakens bones and elevates fracture risk, especially in women.
  • Calcium absorption is a critical factor in bone health, influenced significantly by vitamin D.

Purpose of the Study:

  • To investigate the role of vitamin D and its metabolites in age-related bone loss and osteoporosis.
  • To evaluate the efficacy of calcitriol and vitamin D in improving calcium absorption and reducing bone loss.
  • To explore the impact of reduced sunlight exposure and vitamin D insufficiency on bone health in the elderly.

Main Methods:

  • Review of physiological regulation of calcium absorption by vitamin D and its metabolites.
  • Analysis of studies involving calcitriol treatment in osteoporotic women.
  • Examination of vitamin D levels in elderly populations, particularly those with hip fractures.

Main Results:

  • Small doses of calcitriol significantly improve calcium absorption and slow bone loss in osteoporotic women.
  • Vitamin D levels decline with age due to reduced sunlight exposure, especially in housebound individuals.
  • Low vitamin D levels are prevalent in elderly hip fracture patients, suggesting a link to accelerated bone loss.

Conclusions:

  • Vitamin D plays a crucial role in maintaining bone density and preventing fractures.
  • Calcitriol and vitamin D supplementation show promise in managing osteoporosis and reducing fracture risk in the elderly.
  • Further development of vitamin D analogs and increased use of vitamin D itself are warranted for osteoporosis treatment.

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