The reason you see those bigger numbers week one, is from people that weren't very healthy to begin with. Some of it is fat, but a lot of it is due to the detoxing of the body and getting rid of the bloat caused by processed foods and other allergens.
After that initial week, 1-2.5 pounds per week is the goal. That is healthy FAT LOSS that is maintainable, and helps to eliminate the 'yo-yo' effect!
Just keep following the plan as close as possible! Remember, the little things make a BIG difference! I see people that start seeing results, then they 'slack off' and the results slow down.
Make it your LIFESTYLE and you will be at your goal in no time! :)