Check These 5 Signs of Insulin Resistance That Often Appear Years Before Diabetes

Dr. Jetsadej Bunyavongwiroj, Deputy Director of Primary Care at Maha Rajah Nakhon Ratchasima Hospital, shared crucial information about diabetes on Facebook, highlighting five early warning signs of insulin resistance that appear years before diabetes onset. Diabetes doesn't develop overnight—the body typically goes through an insulin resistance phase for years before blood sugar rises enough to be detected, during which many people still have normal sugar levels and believe their health is fine, even though their insulin is working increasingly harder to keep blood sugar stable. When the pancreas eventually becomes exhausted, blood sugar spikes and diabetes develops, but the insulin resistance phase is the most reversible stage if caught early.

The five warning signs are: 1) Frequent and rapid hunger, especially for sweets, with feeling full quickly fading—this occurs because when the body is insulin resistant, sugar doesn't enter cells efficiently, so the brain feels energy-deprived despite high blood sugar. 2) Difficulty losing belly fat and easy weight gain, particularly around the waist, because insulin directly controls fat storage. 3) Drowsiness after meals and mental fog, especially after carb or sugar-heavy foods, as the body becomes exhausted when insulin surges to pull down elevated blood sugar. 4) Dark patches on the neck, armpits, or skin folds (Acanthosis Nigricans), a sign of chronic high insulin often seen in insulin-resistant people, especially those gaining weight rapidly. 5) Warning-level blood sugar values even before diabetes diagnosis—fasting blood sugar above 100 mg/dL or HbA1c above 5.7% indicates emerging risk.

Crucially, elevated fasting insulin levels (above 10–15 µIU/mL) or a high HOMA-IR score (above 2) also signal insulin resistance, particularly when combined with high triglycerides, low HDL cholesterol, or waist circumference exceeding 90 cm for men or 80 cm for women. To reduce insulin resistance, start with basics: walk 10–15 minutes after meals to help muscles use glucose, reduce sugary drinks, tea with condensed milk, and refined carbohydrates, ensure 7–9 hours of sleep, reduce waist circumference even without major weight loss, and regularly monitor HbA1c, lipids, and fasting blood sugar if at risk. In summary, insulin resistance typically begins years before diabetes and produces subtle warning signs like belly fat, frequent hunger, drowsiness after eating, and dark skin patches—the earlier intervention starts, the greater the chance of reversal.