Finishing up the third book now and quite enjoyed this series. Something that's fascinating about the books is gods and religion are never mentioned. The idea of idols is played around with, with The Capitol demanding worship and Katniss as the Mockingjay becoming a savior figure, but none of it is ever given supernatural attribute.
Very humanist perspective, and an obvious emphasis on the flesh. There's a constant fascination, obviously, with food and hunger, and on the human body being treated like so much meat (not just the Tributes' deaths in the arena, but the Capitol people tattooing and decorating themselves).
These little details elevate The Hunger Games above something like Twilight.