Like most here, I started off following the doctor's/dietician's recommendations as at according to what here in Sweden is called the "Tallriksmodellen" which, as our own Optimist knows, is also know as "the plate model" consisting of 40% carbs, 40% fibre and 20% protein.
I ate oatmeal everyday and didn't think twice about it since my doc had told me to test once every couple of days and then i would always test my morning fastings so I never caught how high my post prandial numbers were. I love oatmeal but if I started at a 5.2 BG, my 1 hour PP would jump to 12.6 and my 2 hour PP would still be elevated at 11.8. There is no way that oatmeal can still be included in my diet and those same numbers apply to any type of grain whether wheat, rye, oat, rice etc...