How can I script a tool to be unusable while under a certain condition?

I've made a tool to recover the value of an IntValue (HungerVal.Value). However, I need this tool to only be usable when the player's thirst and hunger IntValues are above 0. The below code still lets me use the tool when either of those IntValues equal 0, when it should instead be unusable while that condition is true.

local food = script.Parent
local plr = game.Players.LocalPlayer
local HungerVal = plr:WaitForChild("HungerVal")
local ThirstVal = plr:WaitForChild("ThirstVal")
local used = false

food.Activated:connect(function()

	if HungerVal.Value and ThirstVal.Value > 0 then
		HungerVal.Value = HungerVal.Value + 40
		used = true

		if HungerVal.Value > 100 then
			HungerVal.Value = 100
		end

		food:Destroy()

	else
		print("I can't do that! I am unconcious!")
	end
end)