In answer to your question, No. I have been fasting on my DD s for the last month or so, total of 150 cals, my weight loss hasn't speeded up if anything its slowed but thast probably just me. I have been doing a lot of reading over the last couple of days and on the low carb friends forum (American) which has a Juddd section a lot of Juddders found that their weight loss actually increased when they ate their DD cals. I only fast because I find it easier to get through the day, but as of today I have started to eat my DD cals again to see if it makes any difference to my loses. I am also getting my UP days under a bit more control because its the school hols so no school run exercise and more food around.
Juddd is not known for fast weight loss but some do lose good amounts, expect 2lbs a week when you have settled into the plan. What you will find though is that you will lose size quicker than weight , you won't get diet fatigue and Juddd is really enjoyable if you let yourself enjoy your UP days, otherwise you may as well just cal count. Juddd is a great diet especially for long term success x