It is heavily implied that people have been eaten. Only one scene where it’s shown, it’s during a vision sequence the mother has after touching the book in Izzy’s room
Lots of blood being spit in thick amounts from mouths, lots of blood from killing, there’s rotting animals shown, mostly bones, some still have flesh on them
Some guy is shown kind of ripped up, it’s bloody, but not seen up close, more of like a dreamy sequence. Someone is missing the bottom half of their body, it’s bloody and gross.
Except for a worm being dropped inside a tequila glass, you visually never see animals suffering or being harmed. However, you see characters "eating" insects and talking about the death of animals such as deer and dogs.
There is a scene where one of the characters is eating another person and it’s gross and gory. About 1hr 10min is where it is, after the mom puts her hand on the book in Izzy’s room. It’s also implied that she’s been eating other people.