Hello! May I join you? I haven't done 5:2 yet (I mean, as a weight-loss mechanism), but I'd like to maintain my weight with it, as it seems a sustainable and healthy approach to eating.
Since April, I've tried to overhaul completely my weight and - more importantly - health. I was creeping close to the 'overweight' band in the BMI calculator, and was feeling just generally a bit blobby. My weight had been slowly creeping up for a couple of years, and I suddenly realized that (though I looked ok-ish [I'm an hourglass and distribute weight evenly over my body when I put it on]), if I kept on as I was I would be overweight, and it would become more difficult, not less, to get back into shape. Also, at 36 I was now nearer to 40 than 30...
I've lost 14kg with calorie counting (using MFP; this has mainly meant being ruthless with portion sizes and cutting out all chocolate and cake), and I'm now at 60kg. At 5ft8in that gives me a BMI of 20.1 and a body-fat % of 23 (I think). I completed C25K over the summer, and now run 3 times a week, and have bought The Shred and will try to start that next week (I'm anal about needing to start things at the beginning of the week...
). I'm exercising for fitness purposes and because I look better for it. [vain]
I'm hoping that 5:2 will be good for me, as I'm a bit anxious that my thinking about food over the past few months has become very, very mildly 'disordered' (I use that reluctantly, as I wouldn't want to hurt anyone who has really suffered an ED). At the moment, if I feel the urge for something like a cake or chocolate, I find myself paralyzed with indecision: on the one hand, I am very aware of the 'cost' calorie-wise and feel worried that if I eat something now, I will struggle later in the day or will over-shoot my 'goal', on the other, even if I decide to 'allow' myself something very calorific, I can't decide on anything, as nothing seems 'worth' it (that is, I won't enjoy it enough to justify the calories), except ice-cream, and then I'm likely to eat my way through an entire tub, so I avoid that too! I feel a little bit apprehensive about eating to my TDEE (which is 2073, apparently; my MFP goal has been 1200) again and maintaining, rather than being in 'weight-loss mode', if that makes sense.
So, I don't think I have yet found an entirely healthy balance or mind-set, and I'm hoping that 5:2 will help to re-set all that.
As a family, we eat almost no processed food (except baked beans, some store-bought bread [though very little]), and I make our meals from scratch. We eat a lot of vegetable-based meals and fish quite regularly, and rarely eat red or white meat (as much because of the cost as for health reasons), so it is not a struggle for me to eat healthily or well - I just have to keep an eye on portion size! 
Anyone been in a similar position, or have any tips? I'm thinking of starting next week (see above
) as I think I'm at a good weight and need to get out of the idea - which is niggling at me - that I should lose more (before it becomes too extreme for me).
Apologies for the insanely long post. 
TIA! 