Chromium and Manganese in Japanese Diet

Abstract
Measurements of chromium and manganese in the complete diet samples collected throughout Japan were made to know the normal daily intake and percentage contribution from different food-groups. More than 70 per cent of manganese is supplied by plant products, while chromium is more evenly supplied by each food-group as in the case of iron. The daily intake of manganese is 2.7 ∼ 2.9 mg in adults. The ratio Mn : Cr in raw food materials on the average was found to be 21.0 (range : 5.4 ∼ 63.6), while that in cooked servings was only 3.1 ∼ 4.0; this may suggest the introduction of chromium in the course of cooking.

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