You don't need to even use Iron Gut. Just grab some eggs or kill an animal in the first day or two and you'll be fine. Or loot a few kitchens and you'll most likely find canned food, though I personally avoid eating that without cooking it unless it is one of the types that don't have a recipe. Food in this game is extremely easy to get, so you shouldn't ever be dying of starvation. There really isn't any reason to make it so you can go days without food. You shouldn't ever be down to 0 food in this game to begin with, so it wouldn't affect 99% of people if they changed it.
Also, this isn't a game that focuses on realism. It's just a game.
Including vehicles. Very realistic!