yes, phenylketonuria progressively leads to mental retardation. In phenylketonuria, there is lack of enzyme phenylalanine oxidase which generally oxidises phenylalanine to tyrosine. Hence, accumulation of phenylalanine occurs. This leads to a mousy smell a well as mental retardation.
Because if it is left untreated it can cause brain damage and severe mental retardation
Single gene defects such as phenylketonuria (PKU) and other inborn errors of metabolism may also cause mental retardation if they are not found and treated early.
Having a mental issue can affect learning in a number of ways. It makes communication a bit harder. Mental retardation also can affect learning because of social problems and interaction with those who are teaching.
Overstudy does not cause mental retardation.
mental retardation caused by an expectant mother's alcohol abuse
TThere are quite high as it comes in different types of mental retardation.
literature review on mental retardation with reference
Exposure to lead can also cause mental retardation.
Mental retardation occurs in 2.5-3% of the general population.
Mental retardation has different levels. There is Mild intellectual disability; moderate intellectual disability; severe intellectual disability; and Profound intellectual disability.https://www.floridahospital.com/mental-retardation-mr/symptoms-and-signs-mental-retardation
The two conditions are not at all related. Autism does not cause mental retardation.
because some ppl are born with birth defects like mental retardation