Well since I developed the type two diabetes I've drank nothing but water, cut down on coffee, ate nothing besides meals and reduced or tailored meals to slow release sugar food stuffs, I'm eating what is a close approximation of the GL diet, I eat blue berries or grapes sometimes but I cant really eat differently because I experience symptoms. Its something which does bother me occasionally but it has resulted in weight loss all by itself. I still attribute my weight loss to exercise and the gym rather than diet because I've been dieting one way or another for years and never lost any weight like I have since I began my latest training programme.
Wow, very impressive diet. I've had a bit of a crisis moment myself recently (although not anything as serious as Type 2 diabetes), and have been eating much better as well. It's definitely not easy at times, so kudos.
However, your weight loss is almost certainly a combination of your exercise regimen and a low glycemic load diet. With your low GL diet, you aren't consuming the type of foods that normally lead to a blood sugar spike, which prevents the need for high levels of insulin, and in turn helps to negate the fact that your body doesn't quite handle insulin properly. If you were eating high glycemic index foods, your blood sugar would spike, and when your body couldn't put all that excess sugar into the muscles and organs, it would convert it to fat.
In other words, an unhealthy diet, particularly one filled with high GI foods that spike your blood sugar, converts a higher percentage of the calories you eat into fat. Which makes it harder to lose fat.
While I personally believe diet is more important than exercise overall (if you had to choose one), there's room to argue that particular point once you get beyond ridiculously unhealthy diets. However, there's no doubt that diet and exercise go hand in hand, and your best results come from both.