I started this diet as soon as I saw the Horizon programme. I had been doing Weight Watchers up until then.
Im currently 12-8 having got down from 16-7 in August last year. Im 6ft tall so my BMI is now approx 24 and my target weight has always been 11-10 to give me a buffer and stay under 12 stone. I still follow weight watchers albeit loosely on my non-fast days.
Initially I started with 1 fast per week but soon that was upped to 2. My fasts are 36 hour fasts (ish) running from bedtime all through the next day and on until the following mornings breakfast.
I have lately introduced a third fast day and have had three fasts per week for the past 4 or so weeks. I allow myself to skip the 3rd fast if there is any reason whatsoever to allow normal life to take precedence.
During my fasts I drink milky coffee and I have a big mug of Miso soup in the evening which I really look forward to.
Once I get down to target weight I plan to shift back to 5:2 again however I feel like I am now in that zone where the last bits of stubborn weightloss need that extra effort.
Like many posters on here, I enjoy the cleansing feeling and find the feeling of hunger to be almost enjoyable as a symptom of all the good Im doing myself.
I am a runner too and have not found any detriment to the running brought about by my dieting.
As to all the other softer effects claimed in the Horizon program relating to brain benefits etc, I really dont know. If I do feel anything it might very well be placebo but I do feel good in myself. I have certainly been healthier lately in terms of immunitary benefits having had virtually no colds or sneezes or splutters over the past months.
Im also a little too much of an enjoyer of the pleasures of life during the weekends and binge on food at times and even on booze on the odd occasion.
In summary, I think I would find 5:2 in tandem with a cheat enabled version of weight watchers and conscience free weekends a very achievable long term stable lifestyle and I think digging deep into 4:3 at the final stages can make 5:2 seem that little bit easier when throttling back into maintenance.