Not yet investigated
What we have so far
The test that would catch insulin resistance years before glucose moves, and it is not standardised between laboratories — which is why it is rarely trusted.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.