There may not be any dedicated hunger and thirst meters in Starfield, but having a few good food items ready is a practice that players should still be doing regardless. Food grants a number of time-limited buffs when eaten, and they can come in clutch with the various effects they provide.
Starfield: Best Food
Packing a bite to eat is always a good idea in Starfield, especially if the food in question can give some useful buffs.
