Phenylketonuria – Medical Treatment, Diet, and Nutritional Guidelines
Max Müller
2026-03-16
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The cornerstone of phenylketonuria treatment is adhering to an appropriate dietary regimen and, if necessary, employing medical therapy. This diet should be followed throughout the patient's life to prevent the unwanted consequences of this disease. Some food items can be part of the daily diet, while others must be strictly excluded.
Phenylketonuria: Key Insights into the Condition
Phenylketonuria is a congenital metabolic disorder affecting approximately 1 in 7000–8000 newborns in Poland. The condition arises from a deficiency or reduced activity of the enzyme phenylalanine hydroxylase, which is responsible for converting phenylalanine into tyrosine. As a result, phenylalanine accumulates in the body, potentially leading to irreversible damage to the nervous system. Symptoms of elevated phenylalanine levels include concentration difficulties, learning challenges, and excessive physical activity. Without treatment, the disorder can result in severe consequences, particularly irreversible damage to the central nervous system. Early implementation of a phenylalanine-restricted diet is crucial, especially in infants. Diagnosis is made through screening tests, with levels above 10 mg/dl necessitating strict adherence to the diet (D. Włodarek et al. 2015).
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