Caztratt, I just lost 40 pounds with 5:2, going from a BMI of 26.9 to 20.1. My weight loss averaged a pound a week, but some weeks I’d lose two pounds and other weeks I didn’t lose any weight or even appeared to gain weight. Some of that is because of random fluctuations in water weight. My weight loss would seem to stall for a couple of weeks about every 10 pounds or so. My doctor told me that was normal, to just keep on doing what I knew worked and it would start up again, and that did work for me. One thing that can happen, though, is that once you lose a lot of weight, the amount you need to eat to maintain your weight goes down; so sometimes it’s necessary to re-calculate your TDEE and either cut back on what you eat on non-fasting days, or start walking or exercising more.