See, I’m an all or nothing kind of person. “Just the one slice” doesn’t work. I eat the whole pizza. I’ve had much more success with regimented diets. The one I’ve settled on, which has worked well for years, is intermittent fasting. I only eat in a six hour window and this basically means two satisfying meals of whatever. I have to try hard to overeat in that window. It also helps to cut down on snacks.