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Calcium absorption and calcium bioavailability.

P Charles1

  • 1Aarhus Bone and Mineral Research Group, University Department of Endocrinology and Metabolism, Aarhus Amts Universitetshospital, Denmark.

Journal of Internal Medicine
|February 1, 1992
PubMed
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Understanding calcium absorption is key for bone health, not just intake. Isotope tests offer the most reliable method for assessing how well your body absorbs calcium from supplements and food.

Area of Science:

  • Nutritional Science
  • Bone Metabolism
  • Gastroenterology

Background:

  • Dietary calcium intake is commonly emphasized for bone health.
  • Actual calcium absorption is critical for meeting individual patient needs.
  • Calcium absorption involves both active vitamin D-dependent and passive diffusion pathways.

Purpose of the Study:

  • To highlight the importance of calcium absorption over mere intake.
  • To discuss methods for evaluating calcium absorption.
  • To guide decisions regarding calcium supplementation.

Main Methods:

  • Evaluation of various calcium absorption assessment methods.
  • Focus on calcium isotope tests (radioactive or stable) for reproducibility.
  • Analysis of calcium bioavailability from different sources (dairy, vegetables, supplements).

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Main Results:

  • Calcium isotope tests are currently the most reproducible method for determining calcium absorption.
  • Milk and dairy products are primary dietary calcium sources.
  • Bioavailability varies significantly, with some green vegetables having low calcium bioavailability.

Conclusions:

  • Assessing a patient's calcium absorptive status is crucial before increasing intake.
  • Key considerations for supplementation include formulation, dosage, timing, and patient compliance.
  • There is a need for bioavailability data before marketing calcium supplements.