Dark Souls
In Demon's Souls, the player must find health items throughout the game world, but they can carry as many of those items as they like. However, in Dark Souls, the player can only carry a limited amount of Estus Flasks at a time (the game's main health items), but they will be refilled whenever the player rests at Bonfires. Also, "Humanities", which are items that completely refill the player's health, are hard to find.