Gut issues are a common comorbidity with autism, it could just be he had some kind of gluten sensitivity and treating it allowed more energy to compensate for autism.
this.
"morbid" is from the Latin root "morbus", meaning sickness.
Remarkably often I find my partner has a different understanding of English words from me - she was schooled in French and can communicate in Italian and Spanish, but is also fluent in English (though spoken with French mannerisms which seem odd to me as a native English speaker). We often find we descend into discussions of the most correct meaning of a word in English which has a Latin root. The dictionary agrees with her mostly but I have an occasional win.
I recently learned that we use triumph to mean victory, but triumph was originally the ceremonial parade after a military victory.