>>42756If you're seriously wondering why there are fat dudes in stories, it's an easy way to justify a character flaw without being too mean-spirited. Somebody like Homer can be implied to be dumb, unfit, and impulsive from his weight, but his health isn't so terrible that existing would kill him, and he can at least be funny/jovial about it. Men usually can make up for their appearance in other ways, since in order to be a successful dude, you either got people skills, technical knowledge, or just flat-out rich. Look no further than everyone's favorite fat bastard, Santa Claus.
For women, though, most of their appeal in stories is somewhat based on their looks, and don't usually go for the "Hero's Journey" self improvement arc that men usually overcome to be exceptional. For something as simple as being fat, they usually don't have the personality to compensate, or be swallowed by jealousy or envy that prevents them from being content with their size. If they're recently big, that may lead them to be the gossiper of the town to get an edge up from their predicament. Even in the most ideal situations, fat comedians are rarely successful; for every Rosanne, there's an Amy Scheumer, and for every hourglass mom archetype with a little more sand, they're usually side characters to the main character. Mrs. Claus can be hot depending on the angle, but she rarely shows up in stories about the North Pole
tl;dr Women are more often potrayed as being insecure about their size, and don't usually have the charm to take the negative comments. It's still free real estate for a story to have a main character that's a fat girl and likeable. But in mainstream media? Probably not, Mike and Molly's schtick got old fast. That's why it's always stuck in "the writer's barely disguised fetish" episodes where the team doesn't care about filler episodes.