Meditate
Whenever you find yourself below full health you can replenish it by 'Meditation'. This is done by entering the right-most option on the 'Pause' menu and selecting which time of day to sleep until so that when you wake up your health will be fully recovered. Take advantage of this to keep yourself at full health during most of the game without having to use potions or eat food. This only works on the two lowest difficulties.
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