Many agricultural countries around the world are affected by zinc deficiencies.

Zinc deficiency has also been shown to have a negative impact on childhood growth and development.

Zinc deficiency is the fifth leading risk factor for disease in the developing world.

Indeed, zinc deficiency may have effects on virtually all parts of the human immune system.

Zinc deficiency affects about two billion people in the developing world and is associated with many diseases.

Learn more about zinc's functions, food sources, and side effects of zinc deficiency.

A zinc deficiency is indicated by white spots on the fingernails.

One-third of the world population is at risk of zinc deficiency.

Similar features may be present in acquired zinc deficiency.

Severe zinc deficiency in children is common in developing countries.