I think this is a great idea. I could be wrong here, but most things you eat can be called "food" anyway. It would be easy to just use that tag to take from your inventory. I think the problem would be if you were carrying the food in a container, but you cant eat food you aren't carrying anyway right?. Would also add a little bonus to a thief with plant... If you wanted to be annoying, slip a poisoned piece of bread into someones inventory and giggle like a schoolgirl.
This would be good for the new player. And also for the seasoned veteran.