Zinc

About Zinc

Zinc is the second most abundant trace mineral in the body after iron. Official recommended intakes vary by age, sex and life stage. Zinc serves as a structural or catalytic cofactor for hundreds of enzymes, and a substantial share of human proteins contain zinc binding domains, including zinc fingers, among the most common DNA binding motifs in transcription factors. It is required for immune function, wound healing, cell division, taste and normal growth. Deficiency causes growth retardation, delayed sexual maturation, frequent infections, poor wound healing, hair loss, dermatitis and loss of taste. Zinc deficiency is common in low income countries where diets rely on cereals high in phytates, and zinc is used with oral rehydration in the treatment of childhood diarrhea. Zinc lozenges have been studied for shortening colds, with mixed results. An upper intake level has been set because long term excess can cause copper deficiency and related anemia and neurological problems. Food sources include oysters, red meat, seeds, legumes and nuts.