I don't think the project sekai fandom talks enough about how most if not all of Kanade's self neglect habits are things she picked up from her dad's neglect towards himself AND her.
We already saw middle school Kanade being pretty bad with cooking, and when she mentions to her dad how she messed up dinner "again" he doesn't say anything and just leaves her to handle it. At some point he stops eating dinner with her and doesn't even hear her when she calls him. She also mentioned how all he eats while working is cup noodles and it really makes me think she probably picked that habit up because of him.
Another thing I want to mention is that every single one of the happy flashbacks we see with him were before kanamom died. We dont see him spend time with her after that at all. What her grandmother said about Kanade always looking like she blames herself for her mom dying just adds on to it. I think if she could notice it, kanadad would've too.
Not saying it to blame him, I'm aware being a single father without a consistent income is difficult, but I don't think it's a reason to downplay how Kanade was (either intentionally or unintentionally) neglected.
