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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Related Experiment Video

Updated: Jun 16, 2026

Semi-Targeted Ultra-High-Performance Chromatography Coupled to Mass Spectrometry Analysis of Phenolic Metabolites in Plasma of Elderly Adults
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Published on: April 22, 2022

Dietary interventions for phenylketonuria.

Vanessa J Poustie1, Joanne Wildgoose

  • 1Institute of Child Health, University of Liverpool, Alder Hey Children's NHS Foundation Trust, Eaton Road, Liverpool, Merseyside, UK, L12 2AP.

The Cochrane Database of Systematic Reviews
|January 22, 2010
PubMed
Summary

Phenylketonuria treatment involves a lifelong low-phenylalanine diet to prevent cognitive impairment. While effective, its long-term necessity and potential for relaxation remain debated, requiring further research.

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Area of Science:

  • Metabolic Disorders
  • Genetics
  • Nutritional Science

Background:

  • Phenylketonuria (PKU) is an inherited metabolic disorder requiring dietary phenylalanine restriction from infancy to prevent intellectual disability.
  • The restrictive nature of the PKU diet presents challenges for adherence and long-term management.
  • Controversy exists regarding the optimal duration of dietary management, with questions about relaxation or discontinuation during adolescence or adulthood.

Purpose of the Study:

  • To evaluate the efficacy of early-initiated low-phenylalanine diets in individuals with PKU.
  • To assess the impact of diet relaxation or termination on cognitive function, neuropsychological outcomes, growth, and quality of life.

Main Methods:

  • A systematic review of randomized or quasi-randomized controlled trials was conducted.
  • Searches included the Cochrane Cystic Fibrosis and Genetic Disorders Group Trials Register and the Inborn Errors of Metabolism Trials Register.
  • Eligibility criteria focused on trials comparing low-phenylalanine diets with dietary relaxation or termination in PKU patients.

Main Results:

  • Four studies with 251 participants were included, yielding limited significant differences between groups.
  • A low-phenylalanine diet significantly lowered blood phenylalanine levels compared to less restricted diets (MD at 3 months -698.67).
  • One study indicated a higher intelligence quotient in those continuing the diet versus discontinuing it (MD after 12 months 5.00), but this finding requires further validation.

Conclusions:

  • Non-randomized studies suggest low-phenylalanine diets effectively reduce phenylalanine levels and improve cognitive and neuropsychological outcomes.
  • No randomized controlled trials were found to assess the diet's effect versus no diet from diagnosis; such a trial is deemed unethical.
  • Early initiation of the low-phenylalanine diet at diagnosis is recommended, but optimal restriction levels and timing for potential relaxation require further investigation through randomized controlled studies.