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Calcium absorption from small soft-boned fish

M Hansen1, S H Thilsted, B Sandström

  • 1Research Department of Human Nutrition/LMC Centre for Advanced Food Studies, Royal Veterinary and Agricultural University, Frederiksberg, Denmark.

Journal of Trace Elements in Medicine and Biology : Organ of the Society for Minerals and Trace Elements (GMS)
|December 19, 1998
PubMed
Summary

Calcium absorption from small Bengali fish is comparable to that from skimmed milk. These fish, rich in calcium, may be an important dietary source, particularly in developing countries.

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Area of Science:

  • Nutrition Science
  • Human Physiology
  • Food Science

Background:

  • Osteoporosis prevalence is lower in developing countries despite low calcium (Ca) intake.
  • Traditional food surveys may underestimate Ca sources, such as small fish consumed with bones.
  • Ca bioavailability from bone, a component of small fish, requires further investigation.

Purpose of the Study:

  • To compare calcium absorption from indigenous Bengali small fish with that from skimmed milk.
  • To assess the potential of small fish as a significant dietary calcium source.

Main Methods:

  • A controlled study involving 19 healthy adults (21-28 years).
  • Subjects consumed standardized meals containing either small Bengali fish (397 mg Ca) or skimmed milk (377 mg Ca), extrinsically labeled with 47Ca.

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  • Whole-body retention of 47Ca was measured over 19 days; an in vitro method evaluated isotope exchange.

    • Main Results:

    • Calcium absorption from the fish meal was 23.8% +/- 5.6% (mean +/- SD).
    • Calcium absorption from the milk meal was 21.8% +/- 6.1% (mean +/- SD).
    • Absorption rates were not significantly different (p = 0.52) and remained similar after correcting for isotope exchange.

    Conclusions:

    • Calcium absorption from small Bengali fish is comparable to that from skimmed milk.
    • Small Bengali fish represent a valuable and bioavailable source of dietary calcium.
    • Findings suggest these fish could play a crucial role in meeting calcium requirements in populations with low intake.