Although the sheer mentioning of this symptom is bone-chilling, it can happen. It's only in extreme cases if a child is left untreated and neglected. Another contributing factor to the appearance of this symptom is a detrimental diet. The best way to act in this situation is to monitor the day to day situation. A good sign for brain damage ensuing would be a series of cognitive difficulties. Memory lapse, a short attention span and a lack of focus are the prime signs of PKU affecting the brain. It's not too late to act.

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