If i may add another side to the carbs Issue. Before I had Diabetes T2 ,I was a active keep fit fanatic and dependent on carbs. Now I have T2 I no longer a fanatic. However, I do go for one hour daily fast paced walks. I then went on a a Low carb diet and got my fasting mmol/L to 4- 5,and average 8 after meals.
However, I couldn't take a hours walk no longer,as I would feel week,nearly pass out. So I then abandoned the Low Carb diet and went to daily couple of slices of wholegrain bread ,porridge,small portions of wholegrain pasta,baked potatoes etc. I now can walk long periods again.no longer weak,plus my fasting readings have not changed but my non fasting after meals is 10 mmol/L or below.
With the carbs and diabetes issue, I personally think Its down to the Individual and their lifestyles,as we are all different.all lead different lives. Telling the same low carb message to someone who sits at home watching tv all day, to someone who has a physically active job,lifestyle will produce different affects.