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. 1991 Dec;54(6):1059-64.
doi: 10.1093/ajcn/54.6.1059.

A Stable-Isotope Study of Zinc, Copper, and Iron Absorption and Retention by Young Women Fed Vitamin B-6-deficient Diets

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A Stable-Isotope Study of Zinc, Copper, and Iron Absorption and Retention by Young Women Fed Vitamin B-6-deficient Diets

J R Turnlund et al. Am J Clin Nutr. .

Abstract

A 98-d study was conducted in young women to determine the effect of vitamin B-6-deficient diets on zinc, copper, and iron metabolism. Young women were fed vitamin B-6-deficient formula initially, followed by food diets containing four increasing amounts of vitamin B-6. Zinc, copper, and iron absorption, retention, and status were determined at intervals throughout the study. Zinc absorption and retention were greater during vitamin B-6 depletion but serum zinc declined, suggesting that absorbed zinc was not available for utilization. Copper absorption was lower during vitamin B-6 depletion but serum copper was not affected and balance was positive. Iron absorption was not impaired significantly by vitamin B-6-deficient diets but status may have declined. The results suggest that vitamin B-6 depletion of young women may alter zinc metabolism, inhibit copper absorption, and affect iron status. The effects of vitamin B-6 depletion differ markedly among these elements.

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