<unk>  affects about 2.2 billion people around the world. Severe<unk>  is rare, and is mainly seen in persons with acrodermatitis enteropathica, a severe defect in zinc absorption due to a congenital deficiency in the zinc carrier protein ZIP4 in the enterocyte. Mild<unk>  due to reduced dietary intake is common. Conservative estimates suggest that 25% of the world's population is at risk of<unk> .<unk>  is thought to be a leading cause of infant mortality. Providing micronutrients, including zinc, to humans is one of the four solutions to major global problems identified in the Copenhagen Consensus from an international panel of economists.
Zinc deficiency
Zinc toxicity
Manganese deficiency 
Boron deficiency 
Lead poisoning
Iron deficiency
Selenium deficiency
Copper deficiency