Yes, this is why I went to Dr Ted for a physical in Oct, 2016. I was keto/very low carb for almost two years, yet my fasting blood glucose seemed high (100-120). I was worried.
He measured insulin, which came out very low (~3; below 7 is good). So the HOMA-IR was an acceptable number, see the graphic example above. Very comforting! Nothing to worry about.
I rarely meet anyone, even diabetics, who have had their insulin measured and know the number. They go mainly by fbg, which is only half the story. More people should get insulin measured as part of their yearly blood panel.
My other blood panel numbers came back excellent (plus a zero CAC score). This is at age 60, w/ family history of diabetes and heart disease (father died at 64, diabetes, cancer, heart attacks).
So I'm convinced that this diet plus prudent exercise is the magic cure (OK, the ancestral formula, actually). And I have referred many people to Dr Ted, simply a magician.