How can I make a dataStore detect the change of a value of an IntValue with if one changes that the values can be saved with the dataStore?

Well, I want the following dataStore to be saved if a value of the 2 IntValue changes, it really doesn’t work and I don’t know how to fix this

local players = game:GetService("Players")
local datastore = game:GetService("DataStoreService")
local SaveData = datastore:GetDataStore("Hunger&ThirstData")

	local Folder ="Folder")
	Folder.Name = "NeedsPlayerStats"
	Folder.Parent = plr
	local Hunger ="IntValue")
	Hunger.Name = "Hunger"
	Hunger.Parent = Folder
	Hunger.Value = SaveData:GetAsync(plr.UserId) or 100

	local Thirst ="IntValue")
	Thirst.Name = "Thirst"
	Thirst.Parent = Folder
	Thirst.Value = SaveData:GetAsync(plr.UserId) or 100
	if Hunger.Value.Changed or Thirst.Value.Changed then
		SaveData:SetAsync(plr.UserId, Hunger.Value and Thirst.Value)

You need to :Connect() the .Changed event to a function like so:

Hunger.Changed:Connect(function(value) --value is the IntValue's Value property, this is automatically passed in as a parameter
     --Save data

Also, you need to split the .Changed events up. You can call the same function within these connections like this:

     --save function here
     --save function here

Regardless of the code I posted above, you should almost never be saving data to a datastore whenever the value changes. Instead, save the values when the player leaves the games and at regular intervals. Datastores only allow a certain key to be updated once every 6 seconds so if these values are changing often it will cause issues.

To save player data when the player leaves the game you can instead do:

     --save function here

As a final note, when saving multiple variables to a single datastore it’s useful to make a table of the variables and save the table instead. Below is an example of doing that and also an example of what a Save() function could look like in your scenario.

function Save(player)
     local playerData = {
          Hunger = player.NeedsPlayerStats.Hunger.Value;
          Thirst = player.NeedsHungerStats.Thirst.Value;
     SaveData:SetAsync(player.UserId, playerData)