I have suffered with the "low loss" weeks. It is a horrible dissapointment and somehow seems more crushing because of the type of diet you are doing. I also felt like giving up and it was only the support of my group who were fabulous and people around me reminding me how far I had come that got me to white knuckle it through another week.
In my case it was water retention and sure enough (with the help of some nettle tea and increasing my water intake) I had a BIG loss to make up for it.
You ARE burning the fat, but the number hasn't shown on the scales yet - trust that it will. Even though it is hard to keep motivated, (especially quite close the the beginning of your journey), without the comfort of seeing the all important number on the scale going down.
Chin up - all will be great in the long run.
Laura