Phenylketonuria is a rare congenital metabolic disease. The main problem in this disease, the accumulation of the amino acid phenylalanine in the body fluids and the nervous system. This accumulation of amino acids due to lack of enzymes needed to convert phenylalanine to tyrosine, occurs case. Abnormal accumulation of the amino acid in the baby's body is dangerous and leads to disturbances in the brain and skin. These lesions Unfortunately, in the first weeks of birth, with no clear signs as a result of not timely diagnosis and treatment is delayed.  gradually weakened and eventually leading to severe mental disabilities. Unfortunately, over time, a golden chance and diet and medical treatment eliminated next, will have the desired effect.