It can actually work if food will be more valuable and rare to find throughout the game. So that player will think and plan strategically when to rest and do they have enough resources
Only this is in conflict with the fact that the rest is not to be limited. If food becomes too scarce, that's how it will end.
Another thing is that 100g for a carrot would be an inflection that would not make logical sense.
Apart from that, there are spells that by themselves should generate large amounts of food.
