Yes, I also have a problem with the waist measurement method of checking for insulin resistance.

I have lost 28Kg (about 62 lbs) to date. My insulin resistance is no better now than it was when I started to lose the weight. My waist to height ratio was 0.62. Now it's 0.52.

I keep coming back to the glucose tolerance test. I might experiment with the toast glucose tolerance test. Unfortunately, I don't think that insulin acts very linearly. Therefore, because the toast test uses 25g of carbohydrate, being 1/3 of the 75g for the full test, it is incorrect to say that glucose should only rise 1/3.

The toast glucose tolerance test can only be used for a comparative test (ie. monitor progress maybe). Maybe do a toast glucose tolerance test every 2 or 3 months, have a blood test for fasting insulin level once a year and calculate for HOMA-IR. When HOMA-IR reaches normal, then maybe do a full glucose tolerance test a final proof of reversal.