How come I'm unable to change a Players health?

I currently have a vest system and it should be setting the health when a player has a vest but for some reason, it just won't work at all it works perfectly fine without doing that but while doing it it won't work at all what is going on?

game.Players.PlayerAdded:Connect(function(Player)
    Player.CharacterAppearanceLoaded:Connect(function(Character)
        local Humanoid = Character:WaitForChild("Humanoid")

        ---PlayerHealth
        local MaxHealth = Humanoid.MaxHealth
        local Health = Humanoid.Health

        ---Vests
        local Vests = {

            ["TanVest"] = Character:FindFirstChild("TanVest");
            ["BlackVest"] = Character:FindFirstChild("BlackVest");
        }

        ---VestLocator
        local charChildren = Character:GetChildren()

        local tanVest = table.find(charChildren, Vests.TanVest)
        local blackVest = table.find(charChildren, Vests.BlackVest)

        if tanVest then --This without the math works fine but with the math wont, same fo the elseif
            Health = 150
            MaxHealth = 150
            print("Player has a TanVest")
        elseif blackVest then
            print("Player has a BlackVest")
            Health = 200
            MaxHealth = 200
        else
            print("Player has no vest")
        end
    end)
end)