This suggestion seems like it would just make the game seem like chore, having to make sure your character is always well-fed, having to hunt stupid critter to get food, while you could be using that ammo to actually do fun stuff, like fighting other players.
On the other hand, having food be another HP item would be fine. Being able to prepare food as an alternative to crafting drugs would be nice. But not any of this "if I don't give my character enough food, he'll die" ideas. That will just take the from this game, and it isn't a simulation game, it's main focus is on combat, not making sure my character has enough sleep and eats well.