"I wish that.. that being heavily obese was the accepted body type of the whole world."
It was an absurd wish, yes, but it was something you've always wanted to be true. You, yourself, are 250 pounds, probably more since you haven't weighed yourself in months. For all you know, you're over 300 by now. Although you were perfectly fine with your fat figure, you'd always get random looks and judgemental quips launched at you about your size. You just wished you wouldn't be seen as a freak, but could still be as big as you were.
A small slit produced a blue sheet of paper, you teared it off, and read it to yourself. "Your wish has been granted! This slip of paper is your wish token. Keep it safe, for when it is destroyed, your wish will be reset. Enjoy!"
You placed the paper in your back pocket, and decided to check out some other items in the mall. As you left, you saw the cashier sitting down in his tiny booth, scarfing down a 5 layer cheeseburger that barely fit in his mouth. He was easily 500 pounds, or maybe far more. Was he that fat when you entered the store? Surely not, you'd have noticed that. Did the wish work?
As you exited the store, you saw that the wish had definitely come true. Before, the average size of the mall-goers was anywhere from 150-180 pounds, with some outliers. Now, there wasn't a single person under 300 pounds. Everyone had tight clothes that stretched around their expansive bodies, their bellies dropping out from under their shirts. The ground rumbled softly as herds of hogs walked around the mall, some so fat, they were in mobility scooters. Which most stores were about the same, some others were affected by the wish. The most obvious were the restaurants, and how busy they were. One guy with a 400-pound beer belly walked away from Auntie Anne's with a pretzel that probably weighed 20 lbs itself. A new restaurant existed called the LardBall. A quick peek inside was all you needed to see how glorious it was. Apparently, you could buy a 1 hour session in the LardBall, where you were given access to the Fattening Chairs. When sitting in this chair, you'd have a hose which, when you press a button, would flow a hyper-fattening substance into your mouth. You saw a single skinny guy walk into the restaurant, and in curiosity, you waited fir him to exit. An hour later, he came out, nearly 200 pounds fatter, covered in deep, bright red stretch marks.
You were in glorious heaven. You didn't know what to do first.