Anyone know why this LocalScript is only changing the IntValue once?

So this script is meant to use the value of an IntValue I created to decide how big or small the health bar I have created is (the healthbar is a gui, health is inside the localplayer)

this works, in fact, the script runs without errors. But it only changes the size of the gui once and that is to whatever i predetermine the health value to be before I run the game. Any reason for this? Am I calling for anything improperly/does something I call change locations post-player connection?

Here is my code, any help is appreciated:

local player=game.Players.LocalPlayer
local health=player.Health.Value
local mana=player.Mana.Value
local character=player.Character

local function changeHealth()
    local health_frame=script.Parent.Gui.Frame.healthFrame
    health_frame.Size = UDim2.new(0, health, 0, 20)
    print("Done")

end

while wait(.1) do
    changeHealth()
end