sorry I missed this yesterday.
Do join us on the other thread 
The GI diet does revolve around healthy eating and what are sometimes called "smart" carbohydrates - ones with a lower GI that keep your blood sugar stable, avoiding peaks and troughs which make us reach for sugary foods etc.
It has really worked for me - 7 stone off in just over 18 months.
The last couple of weeks I've faffed around a bit, but I think that's inevitable when losing weight over a long period.
Stuff I try to avoid:
anything made from refined carbohydrates eg white flour (these have a high GI and make you feel hungrier quicker after eating them)
"Quick cook" rice and porridge - again have higher GI values
"old potatoes" - new or sweet potatoes have a lower GI
sugary stuff (obviously) - very high GI
I eat a lot of fruit, veg, pulses (eg lentils, pearl barley) beans, porridge (large oats), muesli
I don't bother with bread anymore - even the wholemeal/stoneground recommended on GI as I can never stop at one slice, so I have oatcakes instead.
Lots of helpful books are referred to on the GI threads btw.