Wish my cats had that kind of self regulation. Had them stay at a friends house for a few months when we were repairing a house we had just bought and were staying in a place that didn't allow animals. She just opened the bag of food and thought that the cats would regulate themselves. Boy was she wrong!  I have never in my life seen a cat that fat! They ate so much so fast over a long period of time that they were perfectly round when we picked them up! The skin hadn't had time to stretch much yet so they were stiff to the touch. So fat that when the girl jumped on top of our water heater in the corner, her momentum kept her going off the thing and she got stuck between it and the wall. She was wedged so tight we had to break and take apart the drywall in the corner to get her out😂 A few weeks on their normal amount of food and they were back to normal.