Dietary zinc intake and its effects on zinc nutrition in healthy Japanese living in the central area of Japan

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In the present study, we first examined the dietary zinc intake from food groupsin 109 healthy Japanese (24-82 years old, 45 male and 64 female) by means of the 72-h recallmethod. We then used the ratio of apo/holo-activities of angiotensin converting enzyme(ACE ratio) that is a more sensitive index of zinc nutrition than zinc concentrationin the serum and examined the correlation between their zinc intake and ACE ratio. Dietaryzinc intake in healthy Japanese was maximal from rice and rice products. Therewere significant inverse correlations between the ACE ratio and dietary zinc intakefrom rice and rice products and shellfish, and a significant positive correlation betweenACE ratio and dietary zinc intake from other beans and bean processed foods. On theother hand, there were no significant correlations between serum zinc concentrationsand dietary zinc intake from any food group except processed fish. These findings suggestedthat rice is a major source of dietary zinc intake in healthy Japanese. It is alsosuggested that shellfish also has a major impact on zinc nutrition, although dietary zincintake from this source is minimal. Since beans contain phytic acid, which inhibits theabsorption of dietary zinc, it is suggested that intake of beans causes impairment of zincnutrition.