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Metabolic Approaches to the Results of Autism Spectrum Disorders

Abstract  Although the exact prevalence of metabolic abnormalities in autism spectrum disorders is unknown, several metabolic defects have been associated with autistic symptoms. These include phenylketonuria, histidinemia, adenylosuccinate lyase deficiency, dihydropyrimidine dehydrogenase deficiency, 5prime-nucleotidase superactivity, and phosphoribosylpyrophosphate synthetase deficiency. When the metabolic consequences of an enzyme defect are well defined (e.g., phenylketonuria, 5prime-nucleotidase superactivity), results with diet, drugs, or nutritional supplements may bring about a dramatic reduction in autistic symptoms.

This review evaluates evidence for metabolic etiologies in autism spectrum disorders, as well as for the efficacy of dietary and vitamin resultss. The relationship between gastrointestinal abnormalities and autism spectrum disorders is also considered.