I achieved this by very strict intermediate fasting. Normally you would Limit your self to certainly hours, while I did it every other Day. So every other Day I ate Normally, the following Day I drank only watered down juices, one egg for breakfast and a cup of broth for when I couldnt stand the Hunger. I did this for just a few months not mainly for weight loss (I lost weight), but because even when I did intensive Sport, weightlifting, running, cycling, hiking and kayaking, I grew fitter and gained muscle, but I did not Lose a Single gram of fat. So I felt like I had to somehow "reset" my metabolism. This helped me to cut down on portion size four years ago, and when I Do Cuts and bulks now, it actually works the way it is intended.