@Tragiclady
 
Because she’s best pony.

Dammit Fluttershy, why are you always figuring things out years in advance? D:

Wow this is old! But it takes me back…

On Equestria this would probably be racist. On Earth it´s just hilarious.

You want headcanon? You become a changeling by having all love drained out of you. Vampirism ahoy!

@PSychopompf Thermodynamics. (Philiodynamics? W/e) You’re going to have some loss in every transfer, so that system doesn’t work.
 
If love were extropic (i.e., love made even more love, which I could see happening in Equestria), changelings would be unlikely to predate on other beings – they could be self-sustaining. Why expend the effort to lie to other ponies when you can stay home, cuddle and have dinner at the same time?
 
No, from my viewpoint, changelings either have one of the saddest existences in Equestria, or they really, really are practically soulless. At the very least, a species which is forced to be deceptive and consume misplaced love is going to be amoral in some fundamental ways compared to any species as eusocial as ponies, or even humans.

@Cottontales
 
But what if you had one changeling that had love to drain another changeling and that changeling got drained by another changeling which-

I think because changelings are incapable of feeling love or because it drains the pony who is feeding the changeling so if you drain one changeling to feed another changeling and the only way for that changeling to get the energy lost back is draining another changeling the hive as a whole is either losing energy or not gaining any

Background muffins!!!!

Heaaaadcanon.