Insulin Moves First
Insulin resistance develops long before glucose rises. The pancreas compensates by producing more insulin, and glucose stays normal for years while that compensation holds. Only when it starts failing does fasting glucose or HbA1c move.
This is why fasting insulin is the single most useful test that rarely gets ordered — it sees the problem while it is still easy to change.
Not Only About Sugar
Drivers extend well beyond diet: poor sleep and sleep apnoea, chronic stress and cortisol, low muscle mass, visceral fat, inflammation from the gut, thyroid function, some medications, and environmental exposures affecting metabolic signalling.
Two people eating identically can have very different insulin responses, and the difference is usually in this list rather than in willpower.
What a Fuller Workup Includes
Fasting insulin with HOMA-IR, HbA1c, a full lipid panel including ApoB and triglyceride-to-HDL ratio, liver markers, inflammatory markers, thyroid function, vitamin D and magnesium, and continuous glucose data where it would change decisions.
The plan that follows is about sequencing — sleep and muscle usually before anything exotic — and about retesting so you can see whether the direction of travel has changed.
