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Interactions between zinc and vitamin A: an update

P Christian1, K P West

  • 1Center for Human Nutrition and the Department of International Health, Johns Hopkins School of Public Health, Baltimore, USA. pchristi@jhsph.edu

The American Journal of Clinical Nutrition
|August 13, 1998
PubMed
Summary

Zinc status impacts vitamin A metabolism, but evidence for a strong link is inconclusive in humans. Further research is needed, especially in populations with coexisting zinc and vitamin A deficiencies.

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Area of Science:

  • Nutritional Biochemistry
  • Micronutrient Interactions

Background:

  • Zinc status is known to influence vitamin A metabolism, including absorption, transport, and utilization.
  • Proposed mechanisms involve zinc's role in protein synthesis for vitamin A transport and as a cofactor for retinol dehydrogenase.
  • Existing animal and human studies present inconclusive or weak evidence regarding the direct impact of zinc on vitamin A status.

Purpose of the Study:

  • To critically evaluate the evidence for a synergistic relationship between zinc and vitamin A status in humans.
  • To identify gaps in current understanding and suggest future research directions.

Main Methods:

  • Review and synthesis of findings from animal experiments, cross-sectional human studies, and randomized controlled trials.
  • Analysis of correlations in disease states with compromised liver function.

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Main Results:

  • Animal studies are limited by inadequate control groups, confounding zinc deficiency with general malnutrition.
  • Human cross-sectional studies show weak associations between zinc and vitamin A status.
  • Randomized trials of zinc supplementation have not consistently improved vitamin A status.
  • Positive correlations between serum zinc and vitamin A are observed in severe liver disease.

Conclusions:

  • Clear evidence for a significant public health synergy between zinc and vitamin A in humans is currently lacking.
  • Future research should prioritize understanding this interaction in populations with coexisting moderate-to-severe zinc and vitamin A deficiencies.