Dikus go pretty far back, as far as internet games go. Maybe to almost the origin of the internet. Before that, though, you always had AD&D, and most my Dungeon Masters made me mark off my food and water :P
On Diku you movement rate would slow considerably if you were hungry or thirsty. In EQ the penalty is not quite as severe.
On another note, LPMuds didn't have a requirement of food and water, but food and alcohol were used as small heals. You used to slam them when you needed a heal. Maybe this is the origin of the EQ "You are too full to eat any more" as well.
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