generate questions: Zinc is an essential mineral perceived by the public today as being of "exceptional biologic and public health importance", especially regarding prenatal and postnatal development. Zinc deficiency affects about two billion people in the developing world and is associated with many diseases. In children it 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.
How many people are affected by zinc deficiency? {sep_token} What can consumption of excess zinc cause? {sep_token} Where can you find enzymes with a zinc atom in the reactive center? {sep_token} What can a lack of zinc cause in children? {sep_token} What is extremely important to prenatal and postnatal development? {sep_token} What can cause symptoms in children ranging from diarrhea to retarded growth? {sep_token} In what substance can you find a zinc atom within its reactive center? {sep_token} What causes symptoms such as lethargy and copper deficiency? {sep_token}