What can happen if someone gets too little zinc?

Quote from the Related Link: Deficiencies of zinc have been linked to: * Delayed skeletal maturation and defective mineralization of bone (monkeys) * Weight loss * Intercurrent infections * Hypogonadism in males * Lack of sexual development in females * Growth retardation * Dwarfism * Delayed puberty in adolescents * Rough skin * Poor appetite * Mental lethargy * Delayed wound healing * Short stature * Diarrhea * Pneumonia * Stretch marks (striae) * White spots on fingernails * Reduction in collagen turnover and synthesis (in chicks) * Reduction in collagen (in humans) * Poor Immune system * Acne * Cross-linking of collagen * Hyaluronic acid abnormalities (in swine) * Defective connective tissue * Macular degeneration * Cataracts (in salmon) * Teeth with black plaque like deposits (rats)