What is insulin resistance?

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Insulin is the key that lets glucose from your blood into your cells for energy. Insulin resistance means the cells have stopped responding well to that key - so the pancreas compensates by making more insulin, and for years the compensation works: blood sugar stays normal while insulin levels climb. That is why insulin resistance is silent - NIDDK notes it usually has no symptoms while it builds. Eventually the pancreas cannot keep up, glucose rises, and the diagnosis arrives as prediabetes or type 2 diabetes. It also sits under PCOS, fatty liver, and the metabolic cluster of high blood pressure, high triglycerides, and belly fat.

What drives it: excess weight - especially visceral belly fat - inactivity, poor sleep, and genetics. What reverses it, per NIDDK: the same levers that reverse prediabetes - weight loss of even 5 to 10 percent, regular activity, which makes muscles soak up glucose without needing much insulin, and sleep repair. Muscle is the glucose sink; using it is the treatment.

Measuring it: there is no single routine insulin-resistance test - providers infer it from fasting glucose, A1c, triglycerides, waist size, and sometimes fasting insulin. Signs that hint at it on the skin: dark velvety patches on the neck or armpits - acanthosis nigricans - and skin tags. Those warrant a glucose and A1c check.

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