I've read it before, but it is working for me. Change your food choices and exercise around--don't get in a rut because your body follows that rut. I have added some regular foods (some that I avoided because of calories) and switched around the times I eat things. I also played around with my workouts--and have lost 9.6 pounds in the past two weeks.
I think our body starts finding us to be predictable and doesn't let us lose when we don't surprise it from time to time. It is easy to stick with the same foods and activities, but prevents us from getting to our goals as efficiently as we might like.