Insulin resistance: the years before anyone says diabetes
Blood sugar is the last thing to go wrong, not the first. By the time a report says diabetes, the process behind it has usually been running for a decade.
A patient sits down and says the diagnosis came out of nowhere. Last year the sugar was fine. This year it is diabetes. Nothing changed in between.
Almost always, a great deal changed — it simply was not being measured. Type 2 diabetes is the late stage of a process that runs quietly for years, and the name of that process is insulin resistance.
What is actually happening
Insulin is the signal that tells cells to take sugar out of the blood. In insulin resistance the cells stop listening properly, so the pancreas compensates by shouting louder — producing more insulin to achieve the same result.
For a long time that works. The blood sugar reading stays normal, because the extra insulin is quietly covering the gap. This is the part that matters and the part nobody is told: a normal sugar result does not mean the system is healthy. It can mean the system is working extremely hard to look healthy.
Diabetes appears at the point where the pancreas can no longer keep up. That is not the beginning of the illness. It is the end of the compensation.
The signs that arrive early
- Weight settling around the middle rather than spreading
- Heavy tiredness an hour or two after eating
- Hunger returning soon after a full meal
- Skin tags, or darkened velvety patches at the neck or armpits
- Raised triglycerides with low HDL on a lipid profile
- Fatty liver found on an ultrasound done for something else
- In women, irregular cycles or a diagnosis of PCOS
None of these prove insulin resistance on their own. Several of them together, in someone whose sugar reading is still normal, is a reason to measure properly rather than to wait and re-test in a year.
Measuring it rather than guessing
A fasting glucose on its own answers the wrong question. It tells you whether the compensation is still holding, not how hard the body is working to hold it. A fasting insulin taken alongside it says considerably more, and the two together give a HOMA-IR figure.
Around that: waist measured rather than estimated, a full lipid profile, liver enzymes, and HbA1c to show where the average has been sitting over three months rather than on the morning of the test.
Why it is worth catching here
Because this is the stage where change does the most. The same intervention applied at prediabetes and applied fifteen years into established diabetes does not produce the same result — not because the second patient tried less hard, but because there is less function left to recover.
If a parent or sibling has diabetes, if the weight sits at your middle, or if you have been told your sugar is borderline, that is the moment to measure the whole picture rather than one number.
Nothing here is a diagnosis, and no test should be interpreted from a web page. Bring the results to a consultation — with your current medicines and any previous reports — and have them read with you.
Questions people ask
- What is insulin resistance?
- Insulin moves sugar out of the blood and into cells. In insulin resistance the cells respond less well to it, so the body makes more insulin to get the same job done. For years the blood sugar reading stays normal because the extra insulin is covering it — which is why a normal sugar result does not rule the problem out.
- How is insulin resistance measured?
- A fasting insulin alongside a fasting glucose says far more than glucose alone, and the two together can be used to calculate a HOMA-IR. Waist measurement, triglycerides, HDL and liver enzymes add to the picture. Many people are told their sugar is fine when nobody has measured the insulin doing the work.
- Can insulin resistance be reversed?
- It commonly improves, sometimes a great deal, with sustained changes to food, meal timing, movement, sleep and weight around the middle. How much it improves differs between people and is tracked on repeat measurements rather than assumed.