I am trying to get hold of some shirataki noodles to try out so my son can have more noodles -- maybe even mix with pasta to get the right amount of carbs (which I count)... hard to find around my area. However, even with "R" insulin, we dont experience any glycemic issues with al dente spaghetti in measured amounts - that being, no more than about 1 ounce (28gm) cooked wt., served with lots of meat/sausage (115g) and tomato pasta sauce (about 85g quality sauce -- and not Prego! Pls dont use Prego, it is made with corn syrup). It's actually more a plate of sausage and sauce with some pasta, but my son loves it just the same, and he always ends up on target at check time.
Since we are using "R" insulin, I know he isnt going from on-target up to 150 and back down to 85 in 2.5 hours at check time -- it simply doesnt work that quickly. So I know the meal-GI is quite low, and that is backed up by an app I use. Cream sauce (real cream) works even better. I have also checked at 20-min intervals when first evaluating such a meal, and his BG remains quite flat and stable.