While food is essential in real life, and for many, very enjoyable. But in cRPG It is usually used as a either a buff or debuff. Fact is, it feel like a chore and anything but fun. Yes, there are system with cooking and ingredient matching to create food that act like potion but seriously one may as well call that skill alchemy and the whole "cooking" skill would sound a lot cooler.
I suppose this problem could probably attribute to the medium's limitation (more like exclusion) in the department of taste and smell, computer food is never going to be as fun as the real thing. So if one really want the "realism" bit, there is simply the "strategic" element of if you don't eat, you die thing. So it may be a lot simpler just to use food or ration as a limiter to the range the PC party can stray from population center. This could have some place in a Fallout like survival setting. But high fantasy, I don't know, probably a resource sink with questionable gain.
On another note, the only instance I may argue that "food" was done reasonably well may very well be drinking blood in that old vampire masquerad cRPG.