It was truly an extremely simple wish, made entirely from good intentions.
“I wish that every single human being would always have more than enough food to eat and for no one to ever feel hungry again.”
At first it was fine. World hunger ended in an instant. But before too long a problem became apparent. No one could stop eating. The wish had been clear, an endless abundance of food for every single person on earth, magically appearing the second anyone desired it. But the second part of the wish was the wrench in the plan. To ensure that no one ever felt so much as a pang of hunger, the wish’s world altering magic pushed them to take advantage of their endless food supply. It was impossible to be hungry when you were always mindlessly stuffing down bigger and bigger portions of increasingly delicious decadent and fattening foods after all. Really, you couldn’t imagine your wish working any better.
At first, the second part of the wish, that was a magical, special condition that wasn't in the original plans, wasn't really showing. After all, people had a lot of food to work with, and when I made the wish, I was especially looking at people who absolutely needed it, not at those who already stuffed their faces on the daily.
Though eventually, little by little, that secondary effect was starting to become more noticeable, people were eating more than needed. Their stomachs were, initially, limited by how much food they could take, and how long their digestion process would take, keeping them full for quite a while even after eating. As everything progressed, their stomachs didn't just become capable of handling much larger quantities of food, it was also digesting everything at a faster rate.
And that's what triggered the magic wish - if someone had just eaten, but they were already digesting their food, and after a single minute, they were no longer full - they had to be a little bit hungry. Perhaps not hungry enough for even their subconscious to feel it, but the tiniest of hungers was always noticeable for this magic wish - and people would proceed to eat more.
Stuffing your face became second nature in this new world devoid of any hunger, even the slightest, tiniest, most microscopic trace of hunger. Some people were even eating in their sleep at this point, so eating became a full time, day long activity, where most would be stuffing their faces 24/7, especially the biggest. Considering the sheer amount of delicious food, and just how much everyone was eating, it was no surprise that many had surpassed multiple tons in weight, and were essentially gigantic fat blobs that needed to be constantly full, where all the smarts in their brain and energy in their bodies was used to simply keep eating.
Seeing the joy on their faces as they stuffed themselves and sometimes even each other, from 600 pounders to house sized gluttons, I really, REALLY couldn't imagine this wish having worked better <3