Congratulation you have chosen one of the best diets, but you need a bit more time to adapt and learn how your body responds to certain foods.

No one is the same has you know and some might lose more then others, i have lost around 8 pounds the first week, wish for me is mostly water and glycogen, now in my 3 week i am down 16 pounds wish some of this has to be fat and some well i guess muscles.

The thruth is you have to play around a bit with the diet to see what works for you and what doesnt, some like my girlfriend can actually stay in ketosis while drinking diet sodas add sweetners to there coffee,,,, me i cant, even mouthwash kicks me out.

You gotto experiement with your calories and of course training.

One week is not enough to say, even on high carb low calories low fat diet the first week many have lost an average of about 10 pounds, of course this is water weight because they eat less so glycogen releases exess water.

I would say that you will see the true value of this diet in about one month, after checking what works and doesnt for you.

Keep at it and good luck.