Zinc deficiency is rare in developed countries. However, it can occur in at-risk populations. These include people with unhealthy diets, malabsorption disorders or chronic health conditions. Certain people may be at higher risk of zinc deficiency. These include pregnant women, infants, elderly individuals and vegetarians. This is because of increased zinc requirements or limited dietary sources. Zinc deficiency symptoms can include impaired immune function and delayed wound healing. They also can include hair loss, skin rashes, gut issues, loss of appetite and decreased sense of taste and smell.