The CD is a step-wise programme which begins with a TFR regime for rapid weight-loss which is ketogenic and works on exactly the same principle as LT. When you're ready to stabilise your weight (or if you want to lose more gradually) you move up through the steps, gradually (over a minimum of 8 weeks) replacing their meals with normal food, protein first, then carbs.
The main reason I switched was because of the wider range of flavours (12 shakes, 6 soups, 3 porridges, plus choc bars that don't taste like plimsols!) and the more structured 're-feed' which dove-tails well in to the Montignac Method that I want to use for long term maintenance.
So far , so good but I've only tasted 1 bar, 1 porridge and 1 shake. Watch this space !