Insulin resistance: why 'normal' blood sugar can hide diabetes for years

The disease builds in a slow chain. Each link can stay silent for years.

This is why 'your sugar is normal' is reassurance with a fuse on it. The fight is won or lost inside the silent window, long before the number ever moves.

One number rarely tells the story. Read across each row: sugar is the last column to move.

Notice the trap: in 'early resistance' the fasting-sugar column still reads normal. Insulin and HOMA-IR have already moved.

The Indian cutoffs are tighter. Risk that a European reaches at BMI 25 and a 94 cm waist, an Indian reaches at BMI 23 and a waist of 90 cm (men) or 80 cm (women). South Asians develop diabetes around a decade earlier and at a lower BMI than white Europeans.

The backdrop101 million Indians live with diabetes and 136 million more with prediabetes — about 31% of adults (ICMR-INDIAB, Lancet 2023).

Myth 1 — Eating sugar causes diabetes.

Sugar is a contributor, not the lone cause. The root is insulin resistance, built from refined carbs, too little muscle and visceral fat. White rice and maida do it too.

Myth 2 — Thin people can't get diabetes.

The thin-fat phenotype means a 'normal' BMI can still hide high visceral fat and low muscle. India is full of slim diabetics. Waist beats the weighing scale.

Myth 3 — My sugar is normal, so my insulin is fine.

The opposite can be true. Insulin runs high for years to keep sugar normal. By the time sugar moves, the silent window is nearly shut.

Myth 4 — Diabetes can never be reversed.

Early type 2 can go into remission. In the DiRECT trial, 46% were in remission at one year with sustained weight loss. 'Early' is the operative word.

Myth 5 — Jaggery and honey are safe substitutes.

They raise blood sugar like any other sugar. Jaggery's GI (~84) is higher than white sugar's. 'Natural' is not 'gentle.'

Myth 6 — It's an old person's disease.

Indian type 2 onset is shifting into the 30s and 40s, and now turning up in teenagers. Young and slim is not the same as safe.

Myth 7 — It's pure genetic destiny.

Genes load the gun, but they are not the trigger. On a high-risk South Asian template, daily choices matter more, not less.

Not panic, and not a crash diet. A few ordered moves aimed at the real mechanism.

See a doctor ifyou are urinating often (especially at night), unusually thirsty, losing weight without trying, healing slowly, getting repeat skin or gum infections, or noticing dark velvety patches on your neck or armpits — that last sign is visible hyperinsulinaemia, and it earns a proper metabolic check.

Follow one ordinary arc — it shows the silent window better than any chart.

The all-clear. Arvind, 37, manages a team in Pune. Slim build, no real belly, BMI 24. Every yearly company check says the same thing: blood sugar normal. He files it and forgets it.

The quiet drift. He is tired after lunch and reaches for something sweet at 4 pm. His waist has crept to 94 cm though his weight has barely changed. A dark velvety patch has appeared at the back of his neck; he thinks it is grime that won't scrub off. His father was diagnosed with diabetes at 55.

The real name. A careful doctor, noticing the neck, orders more than fasting sugar. Sugar: normal, as always. But fasting insulin is high and his HOMA-IR is 3.5 — deep insulin resistance. He has been in the silent window for most of a decade. The neck patch was the disease writing itself on his skin.

The turn. Nothing dramatic. He starts resistance training twice a week, drops the afternoon sugar and most of the white rice, fixes his sleep. Over months the waist falls, the tiredness lifts, the HOMA-IR comes down. He caught it inside the window — early enough that it is still his to win.

That is the lesson in one life: the report was never the whole truth.

Step back and the picture reorders itself. The tragedy of diabetes in India is not that it is incurable — caught early, it is often reversible. The tragedy is that we keep meeting it ten years late, at the one moment the report finally turns abnormal, when half the beta-cell reserve is already gone.

This matters because the disease is loudest exactly when it is silent. The decade when fasting sugar still reads 'normal' is not empty time — it is the window when muscle can still be built, visceral fat still shed, and the whole trajectory still bent. Miss it, and you are managing damage. Catch it, and you may never cross the line at all.

The thin-fat finding reframes the mirror, too. For South Asians, looking slim is not the same as being metabolically safe, and the weighing scale is the wrong instrument. Waist, family history, and the nerve to look past a 'normal' sugar are better guides.

The long-term shape of India's diabetes story will be set inside that silent window — in whether we learn to act on a number that has not yet gone wrong. The future of this epidemic is decided before the diagnosis, not after it.