Asking for this is OK, but not so necessary. An indication that your character has eaten on the off time? Sure, but there is just so much food lying around in every camp that’s decorative. If you were to introduce this mechanic, this would make it just a small chore to take care of, because how much food there is around every bunker and stored away.
You want some management mechanics, basically. To implement this it’d need a lot of change in the game to be significant, but this isn’t what the game is lacking. It’s barebone in storytelling and the general gameplay loop of shooting and gaining. There is no real ‘end-game’ for this game. You have some prestige points, but none of it benefits the player enough to have a point in doing.
I think there’s something different lacking, but if there was an introduction to thirst/hunger, there’d need to be massive changes in the world and it’s layouts. There’d need to be periodic changes, when all that huge reserve of food starts running low and now the player needs more solutions etc. This will be more work as time goes on for the Devs and so far they’ve been wrestling bugs for basic implementations. Seems like a concept that’s REALLY far down the road