When children is in good status of zinc nutrition, body surface loss of zinc correlates proportionally with their dietary zinc intake.

Investigate the zinc nutrition state in 2-6 year-old children of Jiyang county. Find out the reason for the lack of zinc and explore the effective way to apply zinc to children.

Five of their top ten involved nutrition: vitamin supplements for children, adding zinc and iodine to salt and breeding extra micronutrients into crops (like those sweet potatoes).