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lüll Zinc homeostasis in humans King JC; Shames DM; Woodhouse LRJ Nutr 2000[May]; 130 (5S Suppl): 1360S-6SMaintaining a constant state of cellular zinc nutrition, or homeostasis, is essential for normal function. In animals and humans, adjustments in zinc absorption and endogenous intestinal excretion are the primary means of maintaining zinc homeostasis. The adjustments in gastrointestinal zinc absorption and endogenous excretion are synergistic. Shifts in endogenous excretion appear to occur quickly with changes in intake just above or below optimal intake. The absorption of zinc responds more slowly, but it has the capacity to cope with large fluctuations in intake. With extremely low zinc intakes or with prolonged marginal intakes, secondary homeostatic adjustments may augment the gastrointestinal changes. These secondary adjustments include changes in urinary zinc excretion, a shift in plasma zinc turnover rates and, possibly, an avid retention of zinc released from selected tissues, such as bone, in other tissues to maintain function.|*Homeostasis[MESH]|Animals[MESH]|Diet[MESH]|Digestive System Physiological Phenomena[MESH]|Digestive System/metabolism[MESH]|Humans[MESH]|Intestinal Absorption[MESH]|Nutritional Physiological Phenomena[MESH]|Tissue Distribution[MESH]|Zinc/blood/metabolism/pharmacokinetics/*physiology[MESH] |