Okay, just a question for people who have seen this movie...
...I have not seen the movie. I'm just going by the premise that I've read. A few years ago there was a short-lived, Twilight Zone-type series called Fear Itself and Elisabeth Moss from Mad Men starred in one installment called "Eater". They seem to have a similar set up. Below is a link to the episode. Is there more than just a similarity?
https://www.youtube.com/watch?v=j8qv2Eo-MVU