Rituals are a very AS thing. My Mother often has to meet my 5pm dinner criteria. I also strictly do not eat or drink (unless extremely thirsty) for an hour before lunch or dinner. My Mother made me nearly panic when she said I had to eat a banana and it was 45 minutes before lunch (I'm on a weight gain diet), and that was not because of the calorific value (I'm over that), but because it was the wrong time!
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I am a partially verbal classic autistic. I am a pharmacology student with full time support.