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American Journal of Clinical Nutrition, Vol 54, 1059-1064, Copyright © 1991 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

A stable-isotope study of zinc, copper, and iron absorption and retention by young women fed vitamin B-6-deficient diets

JR Turnlund, WR Keyes, CA Hudson, AA Betschart, MJ Kretsch and HE Sauberlich
USDA/ARS, Western Human Nutrition Research Center, Presidio of San Francisco, CA 94129.

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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Copyright © 1991 by The American Society for Nutrition