PKU is an inherited condition that can cause mental retardation. The retardation can be prevented by

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PKU (Phenylketonuria) is caused by a deficiency in the enzyme required to metabolize phenylalanine, an amino acid present in many food items. Therefore, a special diet that limits phenylalanine intake can prevent the mental retardation associated with PKU. L-DOPA pills are not effective for treating PKU. While special education programs and adequate sleep are important for overall cognitive development, they alone cannot prevent the mental retardation caused by PKU.

PKU Is an Inherited Condition That Can Cause Mental Retardation