@Cocosilk -- Thanks for starting this thread. Fascinating discussion.
I agree with
@zand. For many of us, insulin resistance probably precedes the diagnosis of diabetes by many years if not decades.
Personally, judging from my then round bellie, I was probably insulin resistant for at least 15 years before diagnosis -- but not any of the HCPs I've seen during this time ever remarked on this or did any furher testing.
Possibly, considerably elevated trigs might be a sign of increasing insulin resistance (in addition to the tendency to belly fat). Ted Naiman (a low carb doc based in Seatle) suggests that the triglyceride-glucose index could be used to estimate insulin resistance in lieu of measuring insulin itself. Here is a link if anyone is interested
https://burnfatnotsugar.com/TyGIndexCalculator.html
So, even if our blood sugars are still normal, but our trigs go up, this might indicate worsening insulin resistance.