The show revolves around a group of six ponies, lead by a unicorn pony named Twilight Sparkle, as they go on adventures and learn what friendship is all about. Twilight Sparkle has now learned enough to become the fourth alicorn princess.
Friendship is Magic (S01E01-2)
In part 1, Twilight accepts the offer to stay with the Apple family for brunch upon meeting Applejack. In a couple of shots before confronting Rainbow Dash, she appears to have eaten too much pie.
Swarm of the Century (S01E10)
Being the cartooniest of the ponies, Pinkie Pie is eating cakes and confectionary intended for Princess Celestia and stays her normal shape. When she swallows an entire cake whole, she bloats up and immediately digests it.
Feeling Pinkie Keen (S01E15)
Pinkie Pie puffs up at one point during her "doozy".
A Bird in the Hoof (S01E22)
As Fluttershy tries to take care of Celestia's sick bird, Philomena, she gives her a warm bath which only causes her to absorb the water and swell up.
Owl's Well That Ends Well (S01E24)
After hiding in a cave to be alone having ruined everything for Twilight out of jealousy for her new owl assistant, Spike comes across a trove of gems, which Spike feasts on before encountering a much older dragon who owns all the gems.
The Return of Harmony (S02E01-2)
In part 2, Spike is regurgitating an endless pile of scrolls that happen to be every single friendship report sent to Princess Celestia. He puffs up during one of them.
A Friend in Deed (S02E18)
While Pinkie Pie tries to cheer up Cranky Doodle Donkey, she mixes up the oven with her confetti cannon, resulting in her and Cranky getting covered in cake batter. This does not cheer him up, but Pinkie steps out of it, leaving a Pinkie-shaped cake that she also eats whole with a similar aftermath to Swarm of the Century.
Putting Your Hoof Down (S02E19)
Fluttershy feeds her animals a pile of pellets which gets them so gluttonous that her mouse takes the whole box and bloats up until Fluttershy passes it to Angel.
Dragon Quest (S02E21)
Spike is the only dragon with a full belly when his newfound friends have a gem-eating party.
MMMystery on the Friendship Express (S02E24)
In the last shot of the episode, Pinkie Pie eats another cake intended for Princess Celestia whole but stays fat afterwards.
Too Many Pinkie Pies (S03E03)
Pinkie's clones swell up before popping like balloons when Twilight Sparkle sends them back to the Mirror Pool.
Spike at Your Service (S03E09)
Spike pumps up Applejack with bellows in belief that she might need some air.
Just for Sidekicks (S03E11)
Angel stuffs a large gem in Spike's mouth to stop his stomach from gurgling.
Three's a Crowd (S04E11)
One of Discord's fantasies in his musical number features him swallowing water out of a well.
It Ain't Easy Being Breezies (S04E16)
Fluttershy lets the Breezies try some of her food, and being small they get full easily.
Maud Pie (S04E18)
Pinkie Pie leaves the rest of the gang bloated after getting them to taste-test heaps of her new rock candies.
The Cutie Map (S05E01-2)
In Part 1, Pinkie has to eat all of Sugar Belle's muffins, no matter how bad they taste, to make themselves look good in front of the villagers. As a result, she gets fat, as well as repulsed, from all of them.
Princess Spike (S05E10)
Spike chows down on a bowl of gems while on a break.