Circadian Variation in Rat Plasma Zinc and Rapid Effect of Dietary Zinc Deficiency

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Abstract
Adult rats on a 12-h light/dark schedule fed a complete diet exhibited a circadian variation in plasma Zn, with a sharp decline of 25% between 8-12 h after the beginning of the light cycle. In rats fed a Zn-deficient diet for 24 h, plasma Zn concentration was similar to that of controls for the first 12 h, but continued to fall further and was significantly lower than controls after 14 h. When rats were fed the Zn-deficient diet beginning at 8 h of the light cycle, their plasma Zn concentration was significantly reduced 6 h later. The results demonstrate the rapid effect of dietary Zn deficiency.

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