Autistic people three times more likely to develop Parkinson's-like symptoms

Duh..? Lots of autistic people have less adrenocorticotropic hormone production, which implies less proopiomelanocortin so less alpha-melanocyte stimulating hormone activity.

Autistic people have weaker substantia nigra, and symmetrically stronger bioenergetic drive from melanin-concentrating hormone.

This is a downstream effect from the persistently dysregulated AVPR2 activity & high body vasopressin that triggers a large chunk of "high functioning" autism.