I am also on my 4th day of Atkins...I started at 178lbs and last night was at 173...I figured I had 40 pounds to lose so also just a start, but I can't believe how much I have lost... I think a little might just be that you can't eat as much...I haven't snacked as often!!
A friend lost 30 in the 2 weeks and he had about 80 to lose also so that sounds not too far off from that.
Think of all the bad sugars you are not eating and that is what stores the fat. Not eating them will help you body to flush out all of the previously store fat from sugar... it does make sense...
Good Luck!!! It's hard to stick to it