I have been on the program for 1 week, and feel like I'm getting used to it. I am still hungry sometimes, but I've gotten used that, too--it's not the "herione junky" kind of hunger (not that I was ever a heroine junky), just a little pang every now and then. And, the food is surprisingly good!
However, I still find myself having pretty low energy most of the time and even fell asleep sitting ...