1986 Volume 3 Pages 161-168
In three experiments (Exp. 1, 2, 3), the 5-day balance study for zinc, copper and selenium were carried out in 16 healthy female subjects aged 20... 21 years. Menus were composed of ordinary foods and were typical of subjects’ usual dietary habits. Meat, seafood, and vegitable foodstuff was superior proportion of the experimental diet in Exp. 1, 2 and 3, respectively. The results obtained were as follows.
1. The zinc intake in Exp. 1, Exp. 2 and Exp. 3 was 7.6, 7.3 and 7.4mg/day, respec- tively. The zinc balance exhibited zero or slightly negative.
2. The copper intake in Exp. 1, Exp. 2 and Exp. 3 was 1.1, 1.1 and 1.8mg/day, respectively. Balance was markedly positive in Exp. 3 and was strongly influenced by the diet composition.
3. The selenium intake in Exp. 1, Exp. 2 and Exp. 3 was 83, 142 and 82-90μg/day, respectively. Selenium was excreted in urine equal to, or more in feces. Retention was markedly positive in Exp. 2, but absorption ratios were Exp. 3 > Exp. 2 > Exp. 1 in order.
4. Factorial analysis of variance was carried out on the effect of the diet composition. The result showed that absorption, the ratio of fecal excretion/intake and urinary excretion of copper were significantly affected by the diet composition, and fecal excretion, absorption, the ratio of fecal excretion/intake and retention of selenium were also affected by the diet composition, but these of zinc were unaffected by the diet composition.
