Hi webbj54
the amount of weight you will lose really depends on what you’re starting at, but Michael in the book says you can lose between 10% and 15% of your starting weight.
So it might be good to calculate this – take the lower end, say 12% of your weight, and work out what this loss would be.
Then divide by 8 and this is your notional loss by week. However, most people lose a bit more at the beginning and then quite often plateau in the middle (there are lots of posts here about that!), and finally lose more at the end. And many people with a lot to lose keep on going after the 8 weeks, and they say that they like the way of life and the food anyway!
I would like to lose about 18 lbs which is comparatively little, but have found weighing is not particularly helpful. It’s better to measure yourself, or simply judge by your clothes, as they get looser. I’m 4.5wks in, and have lost c 5 lbs, but this seems to fluctuate up and down! But my waist is thinner, my jeans are looser, and I really do look thinner, even I can see it. Perhaps the fat I’m burning is going off my internal organs, which is also my aim.
Hope this helps, and good luck!