Its possible that it depends on your start weight and activity levels but in short, yes its very possible.
I have my second weigh in tomorrow (I started on 28/8) but its looking like i will have lost around 13lbs. Just got to get your head down and get on with it. I struggled a lot in the first week (but stayed on it) but this week has been much better. I takes a while to get used to the products
x