[Mean]

pawn Код:

//Top of script
forward HungerTimer(playerid, Float:health);

then

pawn Код:

public OnPlayerSpawn(playerid)
{
    SetTimerEx("HungerTimer", 10000, 1, "i", playerid);
    return 1;
}

then...

pawn Код:

public HungerTimer(playerid, Float:health)
{
    GetPlayerHealth(playerid, health);
    SetPlayerHealth(playerid, health - 5);
    return 1;
}

Not what you wanted, but this FS takes a player 5 HP every 10 seconds, so he dies when he looses all HP