|A.||a gluten-free diet from age 6 months to 12 years|
In phenylketonuria, a low phenylalanine diet with relentless attention to details of diet is required for a good outcome.
The diet should be started by 3 weeks of age.
Children of mothers with phenylketonuria can be affected if exposed to phenylalanine in utero.
Therefore, women with the disorder should stay on a restricted diet until they complete childbearing.
In phenylalanine hydroxylase deficiency, tyrosine becomes an essential amino acid and dietary supplements must be provided.