Why does my food system work once?

Alright I'm implementing a food system into my game and it works fine, but when I die it just stops updating the GUI I have set up. Please help.

Code:

wait(1)
local player = game.Players.LocalPlayer
local hungerLevels = {full = true, kindof = false, hungry = false, starving = false, dying = false, dead = false}

local function check()
	if hungerLevels.dead then
		player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Dead"
		local calculateDamage = 100 - player.Character.Humanoid.Health
		player.Character.Humanoid:TakeDamage(calculateDamage)
		else if hungerLevels.dying then
			player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Dying"
			local message = Instance.new("Message", game.Workspace)
			message.Text = "YOU ARE DYING OF STARVATION! GO EAT!!!"
			wait(3)
			message:Destroy()
			else if hungerLevels.starving then
				player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Starving"
				else if hungerLevels.hungry then
					player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Hungry"
					else if hungerLevels.kindof then
						player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Okay"	
						else if hungerLevels.full then				
							player.PlayerGui.MainUI.ScreenGui.Frame.HungerInteger.Text = "Full"						
						end					
					end				
				end
			end
		end
	end
end

local function starvationSystem()
	check()
	wait(60)
	hungerLevels.full = false
	hungerLevels.kindof = true
	check()
	wait(60)
	hungerLevels.kindof = false
	hungerLevels.hungry = true
	check()
	wait(60 * 2)
	hungerLevels.hungry = false
	hungerLevels.starving = true
	check()
	wait(60 * 2)
	hungerLevels.starving = false
	hungerLevels.dying = true
	check()
	wait(60 * 3)
	hungerLevels.dying = false
	hungerLevels.dead = true
	check()
end

while player.Character.Humanoid.Health > 0 do
	starvationSystem()
end

while player.Character.Humanoid.Health > 0 do
    starvationSystem()
end

Of course it stops updating. That line of code is saying; "while the localplayer's health is above 0, run the starvationsystem."