SPOILER This film, while fascinating and beautifully made, seems little more than a glorification of self-mutilation. Other users have called it self-love or masturbation, and they mean it in a positive way. But inflicting pain on oneself, mutilating oneself, is not self-love. Masturbation is a wonderful way of making your body feel good. Cutting off pieces of your own flesh and eating them doesn't make your body feel good and shouldn't be glorified or reviewed positively.
So if I've spoiled the movie for you, I must say I'm glad. You don't need to watch this film. You need to do something good for yourself and for your body and leave this movie on the shelf.