Zinc is a mineral that is necessary to maintain your senses of taste and smell. It is vital to the immune system and your body needs it for wound healing. Zinc is one of the minerals that helps protect your eyes and keeps vision sharp as you age. Good sources of zinc include oysters, meat, seafood, poultry, baked beans, and yogurt. Small amounts are found in cashews, chickpeas, cheese, oatmeal, and almonds. Zinc deficiency may result in reduced immunity, growth retardation, and loss of appetite. Severe zinc deficiency may cause diarrhea, hair loss, impotence, weight loss, slow wound healing, and mental lethargy.