We have many A-Z keywords for this term.
Zinc is an essential mineral , including to prenatal and postnatal development.  Zinc deficiency affects about two billion people in the developing world and is associated with many diseases.  In children, deficiency causes growth retardation, delayed sexual maturation, infection susceptibility, and diarrhea .  Enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as alcohol dehydrogenase in humans.  Consumption of excess zinc can cause ataxia , lethargy , and copper deficiency .