My latest story has themes similar to this. An athlete gets a job at McDonald's and ends up putting on weight and becoming lethargic and unathletic. She ends up losing her scholarship to play sports, so of course she regrets it. Though she had never really wanted to gain the weight in the first place, so maybe regret isn't the right word.
https://www.deviantart.com/springbokkx/art/Failed-Athlete-WG-BBW-1006723754