ADHD, learning, and academic performance in phenylketonuria.

Despite having average intellectual abilities, academic difficulties are relatively common in children and adolescents with PKU. These academic difficulties may be a function of attention deficit hyperactivity disorder (ADHD), executive functioning deficits, and processing speed deficits, all of which are known to affect academic performance in non-PKU populations. This review focuses on what is currently known about academic performance in youth with PKU and offers suggestions for future research.