The book is very useful as I dont know a lot of stuff about dieting, this is the first time Ive ever counted calories for example. I like that it has more on the science and the 'how to' of 5:2 and lots of testemonials for inspiration. Because 5:2 is such a simple idea and ultimately flexible you might not need to get it. it does however seem to favour not eating at all for as long as possible to actually 'fast' rather than go low on calorie intake. Say you stop eating at 8, your fast wont really start until about 11pm or midnight, you would then need to go as many hours as you can with a zero calorie intake (so eating your 500 cals at say 6pm would give you an 18hr fast). They do stress flexibility though, what you cant stick to will never work for you. If nothing else the 4000 or so calories not eaten during the week should result in about a pound a week loss. It also talks about GI and GL a little bit. Things I know nothing about but I get the gist to avoid sugar spikes.
How are you all getting on foddier and Chubbycheeks? This being my second week I'm hoping my Friday weigh-in will be a good one!