"Am I becoming insulin resistant?" HOMA-IR and TyG, explained

By the time fasting glucose drifts out of range, insulin resistance has usually been developing for years. The pancreas compensates quietly, pumping out more insulin to keep glucose normal — so a "normal" glucose reading can hide a metabolism already under strain.

What insulin resistance actually is

Insulin’s job is to move glucose out of the blood and into your muscle, liver and fat cells. Insulin resistance means those tissues have stopped listening — the same amount of insulin shifts less glucose into them. It is driven largely by fat accumulating inside cells that were never built to store it, especially in the liver and muscle, which is why excess visceral fat, a chronic calorie surplus and inactivity are its biggest drivers. Because the tissues, not the hormone, are the root problem, changing what those tissues are exposed to is what turns it around.

Look at insulin, not just glucose

HOMA-IR combines fasting glucose and fasting insulin into a single index of insulin resistance. The TyG index uses triglycerides and glucose as a low-cost proxy. Together they reveal the metabolic picture that glucose alone conceals.

How to read the numbers

As a rough guide, a HOMA-IR under about 1.0 suggests good insulin sensitivity, values climbing through the 1.5 to 2.5 range point toward developing resistance, and higher numbers warrant a conversation with your doctor. The TyG index, derived from triglycerides and glucose, tells a similar story from a cheaper, more widely available panel. Reference ranges vary between labs and populations, so the trend in your own numbers over time is more informative than any single cutoff.

Why catch it early

Caught in this silent phase, insulin resistance is one of the most reversible states in metabolic health — it can often be turned around with lifestyle change alone, well before it hardens into prediabetes or type 2 diabetes. The catch is that you cannot act on what you cannot see, which is the whole case for measuring it directly rather than waiting for glucose to fail.

What actually moves it

Insulin sensitivity responds quickly to a handful of levers: losing visceral fat, adding resistance training and post-meal walks, prioritising protein and fibre over refined carbohydrate, and protecting sleep — a single bad night measurably worsens next-day glucose handling. Because these are the same levers that improve nearly every other longevity marker, driving HOMA-IR down tends to pull the rest of your panel with it.

How Misi helps

Misi calculates your insulin axis — HOMA-IR and TyG — from a standard panel, tracks them over time, and connects them to the training and nutrition changes that influence them. Trend it down and you can see the work paying off.

Normal glucose with high insulin is a warning light most people never get shown.