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Phenylketonuric patients decades after diet
R O Fisch1, P N Chang, S Weisberg
1Department of Pediatrics, University of Minnesota, Minneapolis 55455, USA.
Journal of Inherited Metabolic Disease
|January 1, 1995
Summary
Phenylketonuria (PKU) patients who stopped their diet showed no significant intellectual decline long-term. However, continued dietary management is advised due to potential psychopathology and unknown phenylalanine effects.
Area of Science:
- Metabolic Disorders
- Neuroscience
- Genetics
Background:
- Phenylketonuria (PKU) is a genetic disorder requiring early dietary intervention.
- Long-term effects of discontinuing the phenylalanine-restricted diet in PKU patients are not fully understood.
Purpose of the Study:
- To assess intellectual changes in early-treated PKU patients after diet discontinuation.
- To evaluate factors influencing intellectual outcomes and psychopathology in this cohort.
Main Methods:
- Reassessment of 19 early-treated PKU patients who stopped their diet between ages 4.5 and 13.
- Analysis of IQ changes, phenylalanine levels, and correlation with parental education.
- Assessment for evidence of mental disease.
Main Results:
- Minimal average IQ change (<1 point) observed between diet cessation and long-term follow-up (12-28 years).
- Phenylalanine levels were significantly lower at follow-up.
- 26% of subjects showed evidence of mental disease, suggesting diet discontinuation did not cause intellectual deterioration but other factors may be involved.
Conclusions:
- Diet discontinuation in early-treated PKU patients did not lead to significant intellectual deterioration.
- Intellectual status alone is insufficient for dietary decisions; psychopathology and unknown phenylalanine effects warrant continued diet maintenance.
- DNA-based diagnostics may aid in personalized dietary management and psychopathology prediction.