There often are times when people eat. For most a few times a day.
There are other times when people absolutely stuff themselves. This hopefully doesn't happen as often. But when animated characters do it, it goes right to their stomachs and increases their size and figure in a similar manner to filling a balloon. This new-found girth usually goes away pretty easily, but can stay around for a while. A usually-minor form of this, known in slang occasionally as the "food baby", is Truth in Television.
Also, there are times when people don't have anything to eat for a long time, and then they play the trope exceptionally straight. They get kwashiorkor.
This trope is especially popular in Zany Cartoons to the point where attempting to list every example would probably end up with its subpage being longer than all the other subpages together. Compare with Inflating Body Gag, where it's the entire body swelling up. A Gigantic Gulp drink is often a cause of Balloon Belly. May lead to Temporary Bulk Change. Its logical conclusion is "Pop!" Goes the Human. Compare Dinner Deformation, Traveling-Pipe Bulge, and Weight Taller.
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- Western Animation
- One of Nickelodeon's Nickmas bumpers features Angelica as "Grinchelica" in a parody of How the Grinch Stole Christmas!. She steals all the chocolate from the other Nicktoons, realizes what she's done... and decides she doesn't care and gobbles up all the chocolate anyway, becoming very fat as a result, with her cat Fluffy following suit.
Narrator: And all the toons in Toonville say, Grinchelica's tummy grew three hundred sizes that day.
- In Episode 40 of the original Mars Doll cartoon, the titular character ends up with this after eating too many hamburgers during a advertisement shooting. He ends up with a Potty Emergency in the very end.
- Chiasmodon niger, the black gulper, is a deep sea fish with a stomach so extensible that it can eat fish larger than itself, over twice its length and ten times its mass.
- In Deadlands, one of the many varieties of indigenous bloodsucker is the Shtriga, a Central European witch who feeds on blood to power her magic and preserve her youth. She is characterized by her gluttonous appetite, which sees her consuming so much blood that she ends up having to vomit some of the excess, and even after that her stomach is left so swollen and taut that she can easily disguise herself as being a pregnant woman. Her stomach is so important to her that killing her requires staking her through the stomach.