I have noticed that too. I'd remember that when I lost one day, that I had been hungry the day before and had eaten protein.

Even Oprah said on one of her weight loss shows that the 'hunger the night before' was your body getting ready to lose weight. So it isn't only LC. Of course, LCers CAN eat LC foods and still lose while low-cal/low-fat dieters would just have to tough it out.