In a totally immersive, simulation-type role-playing game, the player should not look at bars or numbers to keep track of his or her stats, so another method of showing these stats is needed. For example, the player needs to know when to eat, because games (currently) cannot incite a real feeling of hunger. The player also needs to know if they are hurt, so they can take appropriate measures.
Somehow, these feelings must be represented visually or audibly. I'm not a fan of coloring and blurring the screen to show feelings like how most first-person shooters show that you have been shot. What are some ways to represent these feelings immersively?