What does your meter say. My younger brother was recommended a low GI diet on being told he was pre-diabetic. I did try to encourage him to try lower glycemic load or lower carb but to no avail. No surprise that he is now a medicated type II diabetic.
There is no one size fits all and we are all free to follow what advice we want to. Personally I have found that by following a low carb diet (<50gms in my case) I don't have to take Gliclazide or Januvia (I took both) and I no longer have to have conversations about cholesterol or take Atorvastatin any more as my total cholesterol is now only 4. BTW, I didn't increase fat although I have tried to, I'm better off on low fat and low carb, but that's just me.