Honestly I don’t really have that tick in my brain that says I’m hungry or thirsty.. probably something similar

Yes!! And the weird thing about that is the next day I feel full even though I haven't eaten anything

yup! its evolved into an eating disorder for me and i recommend working on it before it becomes too big of an issue.

I'm usually the opposite where I get so invested in whatever I'm doing I entirely forget to eat or drink until someone either tells me to or something drastic happens.

Ok bc i grew up on Adderall which made me skinny so now idk what’s wrong w me but I have to motivate myself to gain weight

Yeah I'm with you on this. I have been making smaller portions and this has helped a lot. Healthy snacks in between meals like fruit or veg. It's all about finding a balance. Easier said than done. If my mood is low my head says I'm not hungry at all. But other times my head says grab the chocolate that will make you feel better