The cessation of the low-phenylalanine diet at 4 years of age, after 6 months of an essentially unrestricted diet, resulted in no change in growth pattern and no deterioration of mental function.

The ability to identify patients with phenylketonuria (PKU) at birth—and to treat them with low-phenylalanine diets—has resulted in a “much better outcome for individuals with PKU than before,” says ...

Since phenylalanine converts to L-tyrosine, this could lead to low levels. People with PKU may be advised to consume a diet ...

Once a child was diagnosed, a strict low-phenylalanine diet could prevent further damage, but Warner had no easy way to measure phenylalanine levels in his PKU patients’ blood to monitor the diet’s ...