Community Discussion Forum Parent support Blond Hair…..Blue Eyes Reply To: Blond Hair…..Blue Eyes

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Phenylalanine is convertedto tyrosine bytheenzyme phenylalanine hydroxylase (PAH, the one absent in Classic PKU) in the liver, tryrosine is a precurser for the production of melanine which darkens hair, skin and eyes. The low levels of tyrosine, apparent because of this disfunction, are responsible for the fairer features of PKU patients. If you are off-diet, tyrosine levels will increase as it is a naturally occuring amino acid in protein foods just as phenylalanine is, so to assume being off diet will make you fairer is questionable.
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