saphire5 - If you go to www.atkinscentre.com (or something like that) you can find all the information on the first phase - induction. If anything, there is more info on the web site than in the bloody boring book.
Essentially though, in this induction phase you can eat as much fish, meat and eggs as you want along with butter and oil - plus 3oz cheese a day and a set amount of certain salad vegetables and other vegetables. The idea being that you eat under 20g of carbs a day - which come mainly from the veg - so that after a few days your body has to start burning stored fat for energy. Oh yes, and you are not allowed caffeine or sugar.
Does it work? Well it seems to be, and the BBC's diet trials said it was the best diet for fast weight loss. My dh has also lost 7lb and counting.
You do have to think about different ways of eating the food you are allowed - otherwise you'll go mad with boredom. There is only so many times you can have eggs and bacon for breakfast - with no toast or ketchup - and not feel sick. To be honest I find breakfast the hardest meal - I'd just rather have a bowl of cornflakes!
And yes, it can make you feel a bit odd. I seemed to veer between unlimited energy and exhaustion in the first few days - but feel ok now. One tip is to neck a handful of macadamia nuts if you are feeling really rubbish. That definitely made a difference for me. And you must take vitamins too.
Which makes it sound like a truly dreadful way to shift weight - but it's just the first two weeks that are so draconian, then you can slowly add back various different foods and up your carb intake.
Have to say it helps that I have a holiday that I am working towards. It isn't the easiest diet, in as much as I would rather eat a bit of everything in moderation.... problem is what is moderation to me might not quite fit the dictionary definition of the word! But strangely, the fact that it is so limited also works in its advantage. Because it takes several days for your body to change over from burning carbs to burning fat for energy, I've not given in to any cravings for fear that it will tip me back! Also I've found cravings definitely lessened after the first few days - so worth hanging on if you can.
Phew - hope haven't bored you silly!