Hunger, dehydration, and bad hygiene are bad things that happen to players that ignore their character’s needs. These are some of the ways players often die while traveling outside because they either forgot to bring food and water or bathed before they went on a mission. It’s a good idea to monitor your status bars often but it’s not really necessary since your character doesn’t really drop below the threshold that quickly while on one or two quests outside.
It’s a good idea to keep your inventory space open so bringing stuff like food and water bottles are a complete waste especially if you’re planning to do a massive haul. This is why you should fill up your food and water meters before you actually set out on a quest. There’s also a good chance that you get sick if you don’t maintain your hygiene so bathing is also necessary before you go on a mission.