In Hurtworld you'll need to battle the various Status Effects which will make your life in the game harder to survive.
Hunger
As time passes in the game, the hunger bar will start to erode and you'll begin to get hungry, ending with starvation. Eat some food, either File:Owrong.png Owrong or File:Raw Steak.png Raw Steak (File:Cooked Steak.png Cooked Steak for best effects) to move your hunger bar back up.
Cold
Running around the wilderness without clothes is a chilly experience. Build Gear and keep yourself better protected from the elements, before you die of hypothermia.
Heat
You're having heatstroke! Either you're standing too close to fire, or you're cooking something massive in your Machines. Stand back a bit to cool off.
Radiation
For a deeper analysis see Radiation