Memory hacks for Minecraft

There's no external memory hacks for Minecraft?
Is it possible? I've never hacked Minecraft, so I'd like to know what I'm looking at.

This use to be possible and you use to be able to use Cheat Engine to change your mp health back in early betas (if you locked the values). However, Mojang has now implemented a DataWatcher (looks like this: pastebin[.]com/di5UEAc7) which locks values so they cannot be changed externally.