Need help with hunger system,

[MentallyAdvanced]

So im working on a hunger system an the timer either always fails or it doesn't start in the first place, can I have help with this hunger code?

function GM:PlayerSpawn(ply)
	ply:SetGravity(0.9)
	ply:SetMaxHealth(100)
	ply:SetRunSpeed(300)
	ply:SetWalkSpeed(200)
	ply:Give("gmod_tool")
	ply:Give("weapon_physgun")
	ply:Give("cw_m1911")
	ply:Flashlight( false )
	ply:AllowFlashlight( true )
	ply:SetupHands()
	timer.Create( "Hunger", 1, 0, function() ply:SetNWInt("playerHunger", ply:GetNWInt("playerHunger") - .25) end )
end 

Also, So im at the point in my gamemode where it can go 3 ways, Wilderness survival, Post Apocalypse, or Apocalypse, which way should I do it so it would be more enjoyable than other gamemodes?

[thatcatmeme]

[url]http://wiki.garrysmod.com/page/timer/Create[/url]