basically it's a no carbs diet. You can eat all the fat, grease and protein in the world, fried sausages, steak, bacon, butter etc, but no carbs which means no bread, pastry, sugar, most fruits, many vegetables (including potato, so no steak and chips) etc - nothing sugary or starchy, including the naturally occuring stuff. (at least that's my understanding)
A friend of my sister went on it - or at least she went on it but decided she also just had to have toast with her bacon and couldn't give up icecream and chocolate and had to have chips with her steak
In other words she just added fatty stuff to her usual diet - I don't think she lost anything.
Basically, to me it doesn't sound either healthy (since you are actually upping saturated fats and also restricting your dietary range) and most certainly not very sustainable. It works by forcing your body to use it's fat stores because it's getting no carbohydrates which is where your energy comes from. Problem is, once you've lost it, you go back to your previous eating because you didn't learn how to eat healthily and then whammo, back comes the fat. You would also have to REALLY like meat.
To be fair, some people have lost and kept it off and different strokes for different folks and all that, but I'm just not a fan of 'diets' (Can you tell?)
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"