Do you like to eat nuts? I do, but they contain a lot of fat and can be high in calories. I am not surprised that they help with glycemic control, but eating just a few is hard. IF you can manage to eat just a few nuts, then they will make you feel full without adding carbohydrate which increases blood sugar. So you are eating less and controlling your intake. That equals a lower calorie intake.
From the article:
Try to portion out a few nuts to add to your diet - remember they do contain protein but can be part of a healthy renal diet.