We don’t eat too much because we’re more gluttonous than our grandparents. We eat too much because in the 1970s because the McGovern committee convinced us we need to live primarily on low-fat grains and other starches. We eat too much because our insulin levels are too high. We eat too much because we’re storing too many calories as fat.
Yep, as I have said, it's all about hunger. It's been a different world for me for a long time, now, and it's the primary reason I know it's for life. If you eat lots of "whole grains," even fair amounts of sugar, and load up even moderately on other forms of carbohydrate, it's very likely that you and I don't mean the same thing when we talk of hunger.
But I think I know what you might mean. For, I remember a day when hunger was nauseating. It was debilitating. It was: eat something now, and all attention turned to that. It's one reason I talk less about fasting to beginners at this. One day I realized that I had been eating pretty decent paleo for 3-4 months before I did my first fast, I had been eating somewhat "clean" for months before that.
So, now, I recommend that people go until they realize hunger isn't the same anymore ("I could eat, or, I could wait — even a long time… and hey, I kinda enjoy this feeling.") and then try their hand at a fast. Fasting gives you, as I have said, high resolution into your own hunger.
That resolution is the key to making this a style for the rest of your life, and you'll never look back.
Back to Tom's good post linked above.
…emphasis should be shifted toward encouraging people to drastically reduce their consumption of carbohydrates; do that, and the “eating less” will take care of itself.