I have done two three day ones, it was just not practical from a timing perspective so I had to stop them earlier and then somehow to be honest I kind of forgot about it.

For me it stays off for some time but over long time it creeps up again and then I need to do something again, etc. Nowadays I'm going to the gym regularly (only twice a week but still much better than not at all before). From a weight loss perspective it doesn't really do anything but I feel much stronger and much less sleepy, etc.

When I did Keto about 6 years ago for half a year I lost 30 kg, I gained back 20 of them and now lost 8 of them again but still chasing my lowest from back then, but it's difficult.