Insulin Resistance and PMOS (PCOS): How They’re Connected

Medically reviewed by Meg LaFerriere, APRN · Regulate Rx, Lee’s Summit, MO

Insulin resistance is one of the main reasons PCOS was renamed with the word “metabolic.” Understanding it can make many PMOS symptoms suddenly make sense.

What is insulin resistance?

Insulin is the hormone that moves sugar from your blood into your cells for energy. With insulin resistance, cells don’t respond as well, so the pancreas makes extra insulin to keep blood sugar in range.

For a while, blood sugar can look normal on tests while insulin levels run high behind the scenes. Over time, the system can wear down, leading to prediabetes or type 2 diabetes.

How does insulin resistance affect PMOS?

In PMOS (formerly PCOS), high insulin does more than affect blood sugar. It acts on the ovaries and liver in ways that raise androgen levels:

• It signals the ovaries to make more testosterone and related hormones.
• It lowers sex hormone-binding globulin (SHBG), leaving more “free” testosterone active in the body.
• Higher androgens then interfere with follicle growth, so ovulation becomes irregular.
• It can increase hunger and make weight gain around the middle easier.

This creates a cycle where insulin and androgens keep feeding each other. The upside is that improving insulin sensitivity can sometimes ease several symptoms at once, from cycle regularity to skin.

Can you have insulin resistance in PMOS if you’re not overweight?

Yes. Insulin resistance is common in PMOS across body sizes, including in people with a lower or “normal” weight. Extra weight can make it stronger, but it isn’t the only cause. Genetics and the hormonal patterns of PMOS itself play a role.

That’s why the 2023 International Evidence-based Guideline recommends blood sugar screening for everyone with PMOS, not only those in larger bodies.

How is insulin resistance checked in PMOS?

There isn’t one perfect test for insulin resistance in daily practice. The guideline focuses on checking blood sugar regulation instead:

Test	What it shows
75-gram oral glucose tolerance test (OGTT)	How your body handles a sugar load over two hours; the preferred screening test
Hemoglobin A1c	Average blood sugar over about three months
Fasting glucose	Blood sugar after not eating overnight

Fasting insulin is sometimes ordered, but results vary between labs and the guideline doesn’t recommend it for routine diagnosis. Your clinician will also look at signs like darkened skin patches (acanthosis nigricans), waist size, blood pressure and cholesterol.

What helps with insulin resistance in PMOS?

Small, steady changes can improve insulin sensitivity, often regardless of whether the scale moves:

1. Regular movement, including strength training, which helps muscles take up sugar.
2. Balanced meals with protein, fiber and healthy fats to soften blood sugar spikes.
3. Better sleep and stress care, since both affect insulin.
4. Medication when appropriate, most commonly metformin, which the guideline supports for metabolic features in many adults.

Some people also ask about inositol. Research is still limited, and the guideline considers it experimental, so talk with your clinician before relying on it.

At Regulate Rx in Lee’s Summit, our women’s hormone program can help evaluate your metabolic labs alongside your hormones and coordinate care with your primary clinician. Lab fees are listed on our pricing page.

Frequently asked questions

Does insulin resistance cause PMOS?

It’s a major driver for many people, but PMOS has several contributors, including genetics and brain-to-ovary hormone signaling. Not everyone with PMOS has measurable insulin resistance.

Can insulin resistance be reversed?

Insulin sensitivity can often improve with movement, nutrition, sleep and, when appropriate, medication. Because PMOS is lifelong, the goal is ongoing management rather than a one-time fix.

How often should blood sugar be checked with PMOS?

The 2023 guideline suggests checking blood sugar at diagnosis and then every one to three years, depending on your risk factors. Your clinician may recommend more frequent checks if you have other risks.

Sources: 2023 International Evidence-based Guideline for the Assessment and Management of PCOS; The Lancet, 2026; Endocrine Society; American Diabetes Association; NIH/MedlinePlus.

This article is for general education and isn’t medical advice. Treatments aren’t right for everyone, and results vary. Our practitioner reviews your health history before any treatment.