I, too, lost 17 pounds in the two weeks of P1. I think it was largely due to how badly I ate prior to starting SBD. I ate lots of white flour, starchy, and sugary foods, and as soon as I eliminated those foods, the pounds just flew off. My weightloss did slow down in P2 (I would think your body would go into shock if it conitnued to lose that fast for a long period of time), but reamins steady most of the time. I have also found that if I "fall off the wagon" a little bit, I don't need to go back to P1 the way some people do, I just jump right back in where I left off. I think this, also, is thanks to the overall incredibly healthy change in my eating habits. Good luck w/ P2!