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  • Title: Preliminary report on the effects of diet discontinuation in PKU.
    Author: Koch R, Azen CG, Friedman EG, Williamson ML.
    Journal: J Pediatr; 1982 Jun; 100(6):870-5. PubMed ID: 7086586.
    Abstract:
    A collaborative study of diet discontinuation in children with PKU was initiated in 1973. Children treated with the phenylalanine-restricted diet since early infancy were randomly assigned to continue or discontinue dietary therapy at age 6 years after parental consent was obtained. The 115 children participating in this study range in age from 8 to 13 years. At 6 years of age, the IQ of continuers and discontinuers was 101 and 97, respectively. At 8 years, WISC Full-Scale IQ scores adjusted for mean differences on the 6-year Stanford-Binet IQ were 101 for continuers and 98 for discontinuers (P = 0.075). School performance measured by the Wide Range Achievement Test showed significant differences on reading (3.9 vs 3.2) and spelling (3.3 vs 2.9) grade placement, although scores were above actual grade placement (2.7 vs 2.6) for both groups. Continuers and discontinuers were not different in arithmetic scores, with performance at grade placement of 2.7 and 2.6 respectively. Although these data are preliminary in nature, they suggest that subtle changes in cerebral function may occur in children with PKU in whom the phenylalanine diet has been discontinued.
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