How would I make so the server constantly checks if my health is low?

hi,

how would I make it so the server always checks whether the current_health value is below a certain percentage? Whenever I regenerate my health, the health bar does not update therefore it's still yellow instead of green! Plus sometimes <= or >= don't work.

local health = game.Players.LocalPlayer.Character:WaitForChild("Humanoid")
local bar = script.Parent.Parent
local current_health = health.Health / 100
local runService = game:GetService("RunService")

health.HealthChanged:connect(function()
runService.Stepped:connect(function()
bar.Size = UDim2.new((health.Health / 100) * 1,0,1,0) 	

 if current_health >=.51 then
	--green
    bar.BackgroundColor3 = Color3.fromRGB(79, 222, 1)
	bar.BorderColor3 = Color3.fromRGB(61, 172, 2)
	print'green'
 elseif current_health <=.5 then
	-- yellow
	bar.BackgroundColor3 = Color3.fromRGB(222, 171, 42)
	bar.BorderColor3 = Color3.fromRGB(173, 133, 32)
	print'yellow'
 elseif current_health <=.3 then
	--red
	bar.BackgroundColor3 = Color3.fromRGB(222, 75, 55)
	bar.BorderColor3 = Color3.fromRGB(166, 55, 41)
	print'red'
--	
       
end
end)
end)

thanks, hydrogyn

Do a while true do loop with a wait(0.1) inside the script