It's never outright stated as an eating disorder, but due to the high amounts of trauma our protagonist experiences, he begins to struggle with eating during his journey. Even refusing food when he's very clearly weak and thin.
There are eating scenes, but most are short. In one episode an old man in a wheelchair is handed an apple. After a bit of dialogue, he bites into it loudly. Some gory or surgical scenes have squelching.
There is a point in the show where the villain threatens to kill a child but most child death is happening off screen and in storytelling about the villains past
An important location in the story revolves around inducing heavy dissociative symptoms in children, which include giving them "another violent personality" as seen in a character, DID is not mentioned in that context but alluded to. Early on there is a discussion about the antagonist having DID. It leads nowhere and is dropped rather suddenly, quickly.
The villain originally went through horrific trauma and abuse. He grew up to become a master manipulator and actively uses this skill to harm others in various ways.
All scenes are mild in my opinion (ex. it cuts to a character coughing in an alley). Episode 32 has a scene around 18:20 with audio. The character wipes his mouth after. Episode 43- At 1:16 a character sees a dead body, covers his mouth, and runs to an alleyway. Mild audio, no visual. You can skip 25 seconds ahead. Episode 45- at 13:56 a character gags and covers his mouth, but doesn’t v*