A different diet.
I am trying the GI diet because if it works (fingers crossed) then it is something I can sustain forever. So far it seems to involve eating more food than I was eating before, there are cakes you can make, it includes puddings, and includes carbs.
It doesn't include just any carbs or cakes however, they do have to be GI ones which are slow to digest eg porridge not corn flakes, wholemeal bread not white, no butter, but so far (week 1) I am loving it. At the moment it feels a bit too good to be true but I'm enjoying the food so we shall see what happens.