Final answer:
To manage PKU, a child's diet should include meat and eggs, which are typically low in phenylalanine.
Step-by-step explanation:
When teaching the parents of a child with PKU, the nurse would instruct them to include meat and eggs in the child's diet. PKU is a condition where people lack sufficient activity of the enzyme phenylalanine hydroxylase, which results in high levels of phenylalanine in the body. To manage this condition, individuals with PKU must closely follow a strict diet low in phenylalanine. Therefore, foods high in phenylalanine, like some animal products and certain starches, should be carefully monitored or avoided. However, foods like meat and eggs are typically low in phenylalanine and can be included in the diet of a child with PKU.