Insulin resistance is one of the most discussed — and most misunderstood — concepts in metabolic health. This article is a plain-language introduction: what the term means, why clinicians and researchers pay attention to it, and how it is measured. It is general education, not medical advice.

The short version

Insulin is a hormone your pancreas releases after you eat. One of its jobs is to help move glucose (sugar) out of your bloodstream and into cells, where it can be used for energy. Insulin resistance describes a state in which cells respond less readily to insulin, so the body has to produce more of it to achieve the same effect.

For a while, the extra insulin keeps blood glucose in a normal range. Over time, in some people, the system can no longer keep up — which is part of why insulin resistance is studied in connection with type 2 diabetes, metabolic syndrome, and cardiovascular risk.

How it’s measured

There is no single perfect test. Researchers and clinicians use several approaches, each with trade-offs:

• Fasting insulin and glucose — simple blood draws, often combined into an index such as HOMA-IR.
• Oral glucose tolerance test (OGTT) — measures the body’s response to a glucose drink over time.
• Hyperinsulinemic-euglycemic clamp — the research “gold standard,” but complex and impractical for routine care.

Because the methods differ, study results are not always directly comparable — something worth keeping in mind when you read coverage of new research.

Why we write about this

A great deal of the primary research on insulin resistance lives in technical journals that are hard for non-specialists to read. On this site we summarize that literature in plain language and link back to the original sources, so you can always check the science for yourself.

About our sources. When we discuss research that appeared in the former Journal of Insulin Resistance, we are commenting on third-party work — we are not that journal and not its publisher. The journal now publishes as the Journal of Metabolic Health. See our About page for the full explanation.

This article is for general education and is not a substitute for advice from a qualified healthcare professional.