I am a happy 5:2er and I posted my experiences on the main thread earlier today.
I had low-carbed for several years, but it stopped working around the menopause, even after returning to 25g carb induction and then doing the Atkins Fat Fast.
I stopped LC, also because it was making me feel ill, then boomeranged into binging on sugary starchy junk.
I reached BMI 24.9, shocking after a lifetime of being slim and also still training 5-6 days per week.
Most people need a significant, prolonged calorie deficit to lose weight. We are just different in what method works to achieve it, because of our unique combination of metabolism, medications, hormones, preferences, activity level, social commitments etc.
I just can't diet every damn day; However, I can fast one day at a time, because I know I can eat "properly" the next day.
Well, you can eat what you want 5 days a week on 5:2, but don't exceed the total of 5x TDEE.
I ate as usual on my NFDs, which meant well above TDEE. Hence my weight loss was slow.
Also, for the first 3 months, I couldn't manage to do 500-cal fast days; it was usually 800 cals. I lost 10lb, then maintained with 16:8 for 6 months before resuming 5:2. Strangely, 500-cal fasts were then easy.
Maybe those of you who couldn't fast before might also find it much easier the 2nd time round ??
I still exercise intensely 60-90 mins, 5-6 days per week: HIIT spin, boxing, Tabata, weightlifting. I have plenty of energy with fasted training.
It is very slow & difficult to lose bodyfat post-meno, but I am down to 23% and 27" waist. I intend to reach about 20% and 26" this year with 5:2, by watching my NFDs.