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American Journal of Clinical Nutrition, Vol 53, 755-763, Copyright © 1991 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Homeostatic regulation of zinc absorption and endogenous losses in zinc- deprived men [published erratum appears in Am J Clin Nutr 1992 Aug;56(2):462]

CM Taylor, JR Bacon, PJ Aggett and I Bremner
Rowett Research Institute, Bucksburn, Scotland, UK.

The mechanisms involved in the homeostatic regulation of zinc were studied in five male subjects by using stable 70Zn as a marker. When dietary zinc was reduced from 85 to 12 mumol/d, adaptation was achieved by a mean (+/- SEM) reduction in urine zinc of 48 +/- 7% and in fecal zinc of 46 +/- 12% over 25 d in four subjects. The latter was caused by an increase in the efficiency of zinc absorption from 38 +/- 3% to 93 +/- 1% after 15 d of zinic deprivation and by a reduction in intestinal endogenous losses of zinc. In a fifth subject, who had some evidence of a resolving alcohol-induced hepatitis, urine and fecal zinc were reduced by 64% and 41%, respectively, in 15 d and zinc absorption increased from 46% to 93%. More information on adaptive responses is needed to enable current dietary recommendations to be reconsidered.


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