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Zinc Utilization in Young Men Fed Adequate and Low Zinc Intakes¹

Department of Nutritional Sciences, University of California, Berkeley, CA 94720 and U.S. Department of Agriculture, Western Regional Research Center, 800 Buchanan, Albany, CA 94710

Zinc absorption and balances were measured in six young men who were confined while participating in a 75-d metabolic study. A diet of conventional food providing either 16.5 or 5.5 mg Zn/d was fed. Apparent absorption of zinc was calculated from the zinc balance data and from the absorption of a zinc stable isotope added to the diet. The apparent zinc absorption calculated from the isotope data was about 25% when 16.5 mg zinc was fed; it increased to about 53 and 49% after 13 and 42 d, respectively, when 5.5 mg zinc was fed. Total zinc absorption fell from 4.1 mg/d to 2.7–2.9 mg/d during the low zinc period, however. This zinc absorption was sufficient to maintain crude zinc balances in five of the six subjects. Neither serum nor urinary zinc levels changed significantly during the period of feeding low levels of zinc. It appears that zinc absorption readily responds to changes in dietary zinc and that an intake of 5.5 mg Zn/d for about 8 wk does not cause serum or urinary zinc level to fall.

KEY WORDS: • zinc absorption • zinc balance • stable isotope

¹ Research supported by the National Institute of Arthritis, Diabetes, Digestive and Kidney Diseases of the National Institutes of Health, NIH AM 10202.

Manuscript received 7 March 1985. Revision accepted 24 June 1985.

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