This theory doesn't stand in face of science. However: some autistic people have food allergies and comorbid metabolic problems; addressing those will usually a

This theory doesn't stand in face of science. However: some autistic people have food allergies and comorbid metabolic problems; addressing those will usually alleviate suffering-caused problematic behaviors, and thus make communication easier. This doesn't mean it was "autism treatment" or "autism diet"; you'd get the same effect if you treated a toothache in a nonverbal autistic child.