I'm a Fung Fan as well. I started off with IF using 5:2 (the Fast Diet). I then found a mention about Dr Fung by Michael Mosley so over a period of three days I read all his archive posts on his blog before finding out about his on-line lectures. Anyway, I now use a combination of everything; I work 12 hour nights - four on, four off so I have a weird 8 day week. It works out best for me to fast twice a week - one is a 24 hour fast (6pm to 6pm) and the other is from 8pm until 6pm the following day - so 14 hours. The rest of the time I eat a low carb/medium fat diet. I also skip breakfast on all non-work days and I've cut out one of my meals at work. I think the thing Dr Fung has taught me is not to be afraid of feeling hungry. It does, as he says, come in waves and a cup of black decaff, herbal tea or bottle of mineral water eases it.
I started eating this way about two months ago after years of attempting to lose weigh with a 'healthy' low fat diet. I think I am getting there with beating the insulin resistance. I still take 2 x metformin and 1 x sitagliptin but have managed to stop injecting insulin completely during this last week having, at my highest, been injecting 90 units of long acting and around 40-50 untils of fast acting each day. I have managed to keep my fasting bg to 5.4 or under for the last two weeks. I do get an occasional spike, usually when I'm at work - for instance I had one last week at 8.1 when I pigged out on a large bowl of cherries. On the whole fasting has helped me get rid of quite a few niggling health issues which the doctor had been treating individually, I now realise that they must all have been related to the diabetes and so I'm feeling so much better. I didn't start off thinking about weight - I was more concerned to get rid of the insulin resistance - so the 1st 9lbs I've lost is an added bonus.