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Andreas Sigismund Marggraf (German: [ˈmaʀkɡʀaːf]; 3 March 1709 – 7 August 1782) was a German chemist from Berlin, then capital of the Margraviate of Brandenburg, and a pioneer of analytical chemistry. He isolated zinc in 1746 by heating calamine and carbon. [1]
Zinc deficiency is defined either as insufficient zinc to meet the needs of the body, or as a serum zinc level below the normal range. However, since a decrease in the serum concentration is only detectable after long-term or severe depletion, serum zinc is not a reliable biomarker for zinc status. [1]
Zinc deficiency depresses immunity, [53] but excessive zinc does also. [10] Despite some concerns, [54] western vegetarians and vegans do not suffer any more from overt zinc deficiency than meat-eaters. [55] Major plant sources of zinc include cooked dried beans, sea vegetables, fortified cereals, soy foods, nuts, peas, and seeds. [54]
Hypothermia, starvation, lead poisoning [4] or zinc deficiency [5] and diseases including scurvy, along with general exposure to a hostile environment while lacking adequate clothing and nutrition, killed everyone on the expedition in the years after it was last sighted by a whaling ship in July 1845.
Oysters are an especially rich source of zinc, containing “anywhere from 28.1 to 32 mg of zinc per 3 oz serving, which is double the 14 milligrams a day referenced in this study,” Whitaker noted.
Zinc deficiency depresses immunity, [238] but excessive zinc does also. [197] Despite some concerns, [239] western vegetarians and vegans do not suffer any more from overt zinc deficiency than meat-eaters. [240] Major plant sources of zinc include cooked dried beans, sea vegetables, fortified cereals, soy foods, nuts, peas, and seeds. [239]
In the elderly, low serum zinc levels have been reported, which weakens the immune system, making them more susceptible to infections and increasing their risk of morbidity. Aging impairs T cell function, particularly due to zinc deficiency, and the reduced synthesis of metallothionein disrupts zinc balance in the gut and other tissues. [171]
Another primary cause of dysgeusia is zinc deficiency. While the exact role of zinc in dysgeusia is unknown, it has been cited that zinc is partly responsible for the repair and production of taste buds. Zinc somehow directly or indirectly interacts with carbonic anhydrase VI, influencing the concentration of gustin, which is linked to the ...