In short: current food system in ‘regular’ mode is not bright. To make it more interesting we would try an experiment by removing food from provisioner shop. It fits in lore alright – war with Morgoth made bag of gold cost less than bag of wheat. Food is rare and you should find it to survive.
Don’t worry, guys, there are plenty of food in the dungeon, stolen from fellow townies by orcs 🙂 You just need to put some effort to get it (and you would meet a lot of interesting situations and adventures in process!).