Dead is dead is the only thing I've done when I RP in Skyrim. That includes reloading, ever. (just when you continue playing again another day).
I can RP with a bunch of mods, such as imp's more complex needs, chesko's frostfall etc, but not without them.

But overall, you could try to eat on a regular basis, only carry one-three weapons, one set of armor, not use healing potions in combat, sleep when it gets dark, etc.
Edit: Also, as Arcona Cor said, giving your character a personality and always acting according to it (instead of "what will give me the most reward/benefit"), can be added to the mix.