Zero carb? How do you do that other than fasting?
Fairly straight forward, don't eat anything with carbs in it, which is basically all plant food. Animal sourced foods only have zero carbs (well, technically a bit but not enough to register). We have a community for that lifestyle, welcome!
I did a 7 day fast some time ago. https://tube.jeena.net/w/hSpSWFhcCMwVUtBq1CdZJQ
Nice! I'm view 72! Have you done any fasts since then? I notice your refeeding had carbs, you might want to avoid that in the future - carbs cause a big insulin response, which might not be fun! From what I've read you want to kick start things back up with protein/fat (the classic egg) for awhile before adding in carbs slowly (and taking a bunch of electrolytes).
After your fasting window when you went back onto your normal eating pattern, did the 7kg stay off?