What is the food group must persons with PKU avoid in order to prevent retardation?

The food group that persons with PKU (phenylketonuria) must avoid in order to prevent retardation is foods high in phenylalanine. Phenylalanine is an amino acid that is found in many foods, including meat, fish, poultry, eggs, dairy products, nuts, seeds, and legumes. Persons with PKU are unable to properly metabolize phenylalanine, which can lead to a build-up of this amino acid in the blood and cause serious health problems, including intellectual disability, seizures, and behavioral problems. Therefore, individuals with PKU must follow a strict diet that is low in phenylalanine in order to prevent these complications.