what is zinc

[, Prasad AS. This allows zinc to make contact with the rhinovirus in those areas. Researchers have suggested that both zinc and antioxidants delay the progression of age-related macular degeneration (AMD) and vision loss, possibly by preventing cellular damage in the retina [72,73]. Zinc oxide is used to protect rubber polymers and plastics from ultraviolet radiation (UV). Food Assistance and Nutrition Report Number 36, 2003. [98] Plants that grow in soils that are zinc-deficient are more susceptible to disease. [177], Zinc homeostasis of the body is mainly controlled by the intestine. The recommended dietary allowance for elemental zinc is 11 mg daily for men and 8 mg for nonpregnant women. While use of these products as directed (0.5–1.5 g/day) is not of concern, chronic, excessive use can lead to zinc toxicity, resulting in copper deficiency and neurologic disease. [209] Zinc is also found in beans, nuts, almonds, whole grains, pumpkin seeds, sunflower seeds, and blackcurrant. Am J Clin Pathol 2005;123:125-31. Electricity is produced because the Volta potential between the two metal plates makes electrons flow from the zinc to the copper and corrode the zinc. In: Shils ME, Shike M, Ross AC, Caballero B, Cousins, RJ, eds. Dynamics of Poverty and Food Sufficiency. Because of this, zinc oxide used in nuclear reactors as an anti-corrosion agent is depleted of 64Zn before use, this is called depleted zinc oxide. Institute of Medicine, Food and Nutrition Board. Studies show that poor, malnourished children in India, Africa, South America, and Southeast Asia experience shorter courses of infectious diarrhea after taking zinc supplements [62]. Visual acuity loss was not significantly affected by zinc supplementation alone. J Am Coll Nutr 1993;12:26-30. [231], In 1982, the US Mint began minting pennies coated in copper but containing primarily zinc. Zinc oxide is widely used as a white pigment in paints and as a catalyst in the manufacture of rubber to disperse heat. For infants up to 12 months the RDA is 3 mg/day. High dose zinc increases hospital admissions due to genitourinary complications. [136], Zinc dithiocarbamate complexes are used as agricultural fungicides; these include Zineb, Metiram, Propineb and Ziram. Plasma zinc as a predictor of diarrheal and respiratory morbidity in children in an urban slum setting. Acute adverse effects of high zinc intake include nausea, vomiting, loss of appetite, abdominal cramps, diarrhea, and headaches [2]. In fact, … [, Dixon LB, Winkleby MA, Radimer KL. Invest Ophthalmol Vis Sci 1996;37:1225-35. For the same reason, zinc has been proposed as a salting material for nuclear weapons (cobalt is another, better-known salting material). The U.S. Food and Drug Administration (FDA) developed DVs to help consumers compare the nutrient contents of foods and dietary supplements within the context of a total diet. Learn more about the properties and uses of zinc in this article. Thus, the bioavailability of zinc from grains and plant foods is lower than that from animal foods, although many grain- and plant-based foods are still good sources of zinc [2]. [. For U.S. food and dietary supplement labeling purposes the amount in a serving is expressed as a percent of Daily Value (%DV). When galvanised feedstock is fed to an electric arc furnace, the zinc is recovered from the dust by a number of processes, predominantly the Waelz process (90% as of 2014). [52], Various isolated examples of the use of impure zinc in ancient times have been discovered. Food Labeling: Revision of the Nutrition and Supplement Facts Labels. Acta Med Scand 1980;208:209-12. [, Broun ER, Greist A, Tricot G, Hoffman R. Excessive zinc ingestion. N Engl J Med 2005;352:1121.

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