I wouldn’t worry too much. Still 52 days to go. I lost 10kgs in the first week, but didn’t get too excited as it was almost certainly mostly water.
Ontario thing I suggest is use a good nutrition (calorie counting) app. I use myfitnesspal which is excellent but others around. Thing I found was : while I’ve been using that app for over a year before I started BSD, I wasnt losing the weight I “should” have been, based on estimated daily energy intake.
Since starting 8 week fast, I made 2 important changes : I recorded absolutely everything I ingested, especially coffees I drink (white coffees add up!) and ALHOLOL; even more importantly I been weighing stuff.
Turns out I’ve been underestimating my intake for much of the time prior to BSD. on paper I was hitting mto net 1500 calorie a day target, but not losing the 0.5kg a week that should lead to. I now think I was out by a considerable factor, because I was underestimating portion sizes
I’m typical of research that shows this is often the case, even if trying to be scrupulous – people don’t cheat they just create imperfect data.
What am I saying? Without wanting to sound accusatory at all, it is perhaps possible that you are ingesting more than THE 8THIYOU think – especially since its early on and relearning portion size?
Again – I suggest this in the spirit of help, rather than criticism.
Stick with it! And good luck. I’m three weeks in today, and if I’m representative – it works.