This question is just a matter of overall game difficulty.

Dayz is a Survival Game, we can even talk about survival "simulation", and there is three main lever to create this survivalish atmosphere : Zombies, other survivors and food/water.

My feeling is that they're close to the right balance. Make player need less food, and we're getting a pile of useless canned beans lying around. Make player need less food, and give less food : survivors lose a lot of interest in scavenging.

I would even say that it's too easy atm. My char got tons and tons of food and water, and is not struggling with that anymore.
Anyway, eating/drinking should not become an option, and should be a Primary goal for each player.