What is insulin resistance?

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. Pymander is a free AI doctor, 24/7 by text. Describe your labs and your build, and it can help you read the pattern.