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Hypervitaminosis A and bone.

N Binkley1, D Krueger

  • 1Institute on Aging, University of Wisconsin, Madison 53706, USA.

Nutrition Reviews
|June 22, 2000
PubMed
Summary

Excess vitamin A intake can harm bone health by increasing resorption and decreasing formation, potentially leading to bone loss and osteoporosis. This may occur even with low vitamin A intake, suggesting hypervitaminosis A as a factor in osteoporosis.

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Area of Science:

  • Nutritional Science
  • Bone Biology
  • Endocrinology

Background:

  • Vitamin A is essential for various bodily functions, but its role in bone metabolism is complex.
  • Emerging evidence suggests a potential link between vitamin A status and bone health.

Purpose of the Study:

  • To investigate the impact of excess vitamin A on bone metabolism.
  • To explore the potential contribution of hypervitaminosis A to osteoporosis pathogenesis.

Main Methods:

  • Review and synthesis of existing animal, human, and in vitro data.
  • Analysis of the combined effects of vitamin A on bone resorption and formation.

Main Results:

  • Data consistently indicate that excess vitamin A stimulates bone resorption (breakdown).
  • Excess vitamin A also inhibits bone formation (building).
  • This dual action is expected to result in net bone loss.

Conclusions:

  • The combination of increased resorption and decreased formation due to excess vitamin A can lead to bone loss.
  • Unrecognized hypervitaminosis A may be a contributing factor in the development of osteoporosis.
  • Further research is warranted to elucidate the clinical significance of vitamin A levels in osteoporosis.

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