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The aim of this brief report is to stimulate a debate and to advocate life-long treatment with phenylalanine restricted diet to persons with phenylketonuria. We present a case of an adolescent male who today is a 65 year old with moderate mental retardation. He was previously observed as having severe challenging and self-injurious behaviour, sleeping disorder, hyperactivity, and masturbation. In the last year before reassessment he displayed loss of weight, muscle weakness resulting in wheelchair placement, upper respiratory infections, and fungal skin infections. After reassessment in 1998 the patient was started on treatment with a phenylalanine-restricted diet supplemented with vitamin B12, iron, and folic acid. At follow-up one year later the patient had regained his weight and was walking around freely. The challenging and self-injurious behaviour, and the masturbation, had ceased, and he was participating in social activities which he had previously not been able to participate in. At follow-up four years later he was still at this level of accomplishment. In general, this patient's quality of life had increased. We therefore recommend life-long treatment with phenylalanine restricted diet for persons with previously treated, and also for those with untreated, phenylketonuria.

Phenylalanine-restricted diet should be life long. A case report on long term foilow-up of an adolescent with untreated phenylketonuria