There are a couple of simple arbitrators - the blood glucose monitor and the insulin response. Every test I have seen with trigger foods such as bananas show a spike above the guidelines > 9.0 (always should be tested at 30 mins to start with). I have sort out persons who test and even those under 30 years old get extreme results when carbs are put to the test (starchy carbs). Under 2 weeks ago a young lady on one of the food programs on the box, was over a 9 consuming a packet of crisps. Childhood diabetes rates were virtually non-existent less that 60 years ago. I had a chat with a University today to see if they would front some tests on the responses of different foods with regards to blood glucose (maybe more on this another time).
I have seen Andreas Eenfeldt (diet doctor) response to 2 regular meals, Sarah Halberg's response to red melon - neither of these are diabetics, lots of tests of potatoes, spaghetti over 30 minutes plus for others- all result in numbers the guidelines say are too high. I watched a 28 year old Vegan on YouTube eat some Pizza, again blood glucose over 9.0 and higher fbg the next day.
I think 60 - 80 years ago persons in the UK could comfortably eat Paleo level of carbs (meat and 2 veg) with potato carbs quite easily in at least late 60's. In my view modern carbs in bread, pasta, cereals, cakes and the like are a disgrace, I think these "break" our systems, making healthier carbs a poisonous dosage. The numbers in the States say only circa 30% of the population can cope with the carb intake, I would suggest this is similar anywhere the SAD diet is.
If Kraft was right with his interpretation insulin response categorisations, the numbers with blood glucose dysregulation are overwhelming, and even without his definition our eyes and stats show clearly that carbs in a modern context basically lays down fat and disease; then we see when these types of carbs are removed health and bio markers return to normal-ish - this is not coincidence.
The trouble is carbs are delicious, especially when (purposefully) mixed with fat, the perfect "fat bomb". The franken-carbs have turned us into the only animal which cannot naturally regulate our diet (unless we go non-mainstream).