Determination of zinc and copper absorption at three dietary Zn-Cu ratios by using stable isotope methods in young adult and elderly subjects.


Nine young men and six elderly men and women ingested low-zinc, low-copper, and adequate diets for 2-wk periods. The Zn-Cu ratios averaged 2:1, 15:1, and 5:1. On day 8 of each period, subjects ingested doses of 70Zn and 65Cu so that net absorption could be determined. Zn absorption on the adequate diet was 39 +/- 3% (means +/- SEM) in young subjects and 21… (More)


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