Conversation: The conversation between human and AI assistant.
[|Human|] Hi my sister is not well ,she is very confused and gone back to being like a child.she is getting lots of tests and they thought it was a brain tumour but rulled it out ,now they say she has very little sugar in her system and ar testing her for motor nuron desease
[|AI|]  Hi, Any brain pathology involving the frontal lobes of the brain can lead to regressive behavior in which an adult may behave like a child. That is why, her doctors are doing so many tests to find the cause for the pathology. Such behavior is not very common in motor neuron disease, which is typically characterized by muscle weakness, spasms, pain and difficulty in making movements. Regressed behavior can also be due to some psychiatric disorders, though I am sure her doctor must have already assessed her for the same and ruled them out. Best wishes.