Good to see some old friends here, Dukanista! I'm impressed with that weightloss speed as it's often slower for returners to a diet.
I put on all the weight again through ignoring what I knew was happening. So now I've put together what I know from Dukan with other low carb stuff based on more recent research and combining these with Intermittent Fasting. So it's oing quite steadily. But more importantly, in the interim I'd begun to develop pre-diabetes, so needed to tackle that, and much of the weight that returned was visceral fat, not good. The latter went fast and I lost 5" round the waist in a month, am now a stone down and working on the next one.
Most diets shouldn't be mixed, but low carb and intermittent fasting work well together.
Who's on the new Dukan? I prefer the old one and I think it's more effective, though he had to change it because of the misguided court case. Interesting that Dr Tim Noakes in South Africa, who has done much work in low carb for sports and launched a good scientific diet in SA, has been facing a similar sort of thing. Looks like he's winning, though.