Posting because it may, or may not also be ,psychosis/schizophrenia related.
At my Asperger’s post dx appointment I mention a tendency to be dehydrated. The woman I saw mentioned interoception .For me a headache and thirst pips the realisation I’m thirsty. It’s then hard to quench my first.
The hunger one is interesting some people don’t get a signal they’re hungry. I’m the opposite. I often don’t feel full up after eating , and can feel hungry again soon after eating. My stepdaughter said it could be because I’m thinking I’m hungry when actually I’m thirsty.
My daughter has autism and sensory processing disorder. She doesn’t stop eating unless her plate is empty, unless she is sick. She isn’t as bad with drinking, but i don’t think she drinks enough though i try to get her to.