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Perspectives on iron absorption.

Leif Hallberg1, Lena Hulthén

  • 1Department of Clinical Nutrition, Sahlgrenska University Hospital, S-41345 Göteborg, Sweden. hallberg@medfak.gu.se

Blood Cells, Molecules & Diseases
|April 8, 2003
PubMed
Summary

The body effectively regulates iron absorption to prevent overload, but modern societal changes increase iron deficiency risks. Understanding iron homeostasis is key to addressing this common nutritional disorder.

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Area of Science:

  • Human physiology
  • Nutritional science
  • Biochemistry

Background:

  • Iron deficiency is the most prevalent nutritional disorder globally.
  • Existing knowledge on iron absorption and storage control is being refined.
  • Societal changes over the last 10,000 years may impact iron balance.

Purpose of the Study:

  • To establish calculable relationships between dietary iron absorption, serum ferritin, and iron stores.
  • To understand the control mechanisms of iron absorption.
  • To identify critical periods and populations for nutritional iron deficiency.

Main Methods:

  • Clinical and epidemiological observations in humans.
  • Calculation of stored iron amounts and growth rates at steady states.
  • Analysis of iron absorption changes in response to varying iron stores and hemoglobin iron deficits.

Main Results:

  • Established relationships allow calculation of stored iron and its growth rate without model assumptions.
  • Effective control of iron absorption prevents iron overload even with fortified diets or high meat intake.
  • Reduced iron stores and hemoglobin iron deficits stimulate iron absorption, possibly mediated by hepatocytes.

Conclusions:

  • The body has ancient, potent systems for preventing both iron deficiency and overload.
  • Modern nutritional iron deficiency is linked to non-biological societal shifts.
  • Interventions like iron fortification and dietary modifications (e.g., red meat) can significantly impact iron status, especially in vulnerable groups.

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