If you’ve spent any time reading about PCOS, you’ve probably come across the term “insulin resistance.” It’s mentioned constantly — by doctors, in online forums, on wellness blogs. But what does it actually mean for your body, and why is it such a big deal for women with PCOS?

Let’s break it down in plain language.

What Is Insulin Resistance?

Insulin is a hormone made by your pancreas. Its main job is to help glucose (sugar from food) move out of your bloodstream and into your cells, where it’s used for energy. Think of insulin as a key that unlocks the door to your cells.

When you have insulin resistance, those “locks” stop responding properly to the key. Your cells don’t open up as easily, so glucose builds up in your blood. Your pancreas responds by producing more insulin, trying harder to force the door open.

The result: you end up with higher than normal insulin levels circulating in your blood — even if your blood sugar appears normal on standard tests.

How Common Is It in PCOS?

Very common. Research suggests that 50–70% of women with PCOS have some degree of insulin resistance, regardless of their weight. This is a crucial point: insulin resistance in PCOS isn’t just a “weight thing.” Lean women with PCOS can be insulin resistant too.

It’s also frequently underdiagnosed. A standard fasting glucose test can come back normal while insulin resistance is already well established. This is because your pancreas is compensating by producing extra insulin. The problem is hidden until you specifically test insulin levels.

Why Insulin Resistance Makes PCOS Worse

Here’s where it gets really important. Elevated insulin doesn’t just affect blood sugar — it has a cascade of hormonal effects that directly worsen PCOS symptoms:

1. It Drives Up Androgens

High insulin stimulates the ovaries to produce more testosterone and other androgens. This is one of the primary mechanisms behind PCOS symptoms like:

  • Acne (especially along the jawline and chin)
  • Excess hair growth (hirsutism) on the face, chest, or stomach
  • Hair thinning or loss on the scalp
  • Irregular or absent periods

2. It Disrupts Ovulation

Elevated insulin interferes with the hormonal signals that trigger ovulation. This is why many women with PCOS have irregular cycles or difficulty conceiving. When insulin levels come down, ovulation often resumes.

3. It Promotes Weight Gain (Especially Around the Middle)

Insulin is a storage hormone. When levels are chronically high, your body is in “storage mode” — making it easier to gain weight and harder to lose it, particularly around the abdomen. This visceral fat then produces its own inflammatory signals, creating a vicious cycle.

4. It Increases Inflammation

Insulin resistance is closely linked to chronic low-grade inflammation, which is another independent driver of PCOS. Inflammation can worsen insulin resistance, which raises insulin, which increases inflammation — a feedback loop that’s hard to break without targeted intervention.

How to Know If You’re Insulin Resistant

If you have PCOS, it’s worth asking your doctor to test beyond just fasting glucose. Useful markers include:

  • Fasting insulin — this is the most direct measure, but not always included in routine blood work
  • HOMA-IR — a calculated ratio using fasting glucose and fasting insulin
  • HbA1c — measures average blood sugar over 2–3 months
  • Oral glucose tolerance test (OGTT) with insulin — tracks how your body handles a glucose load over 2 hours

Common signs that suggest insulin resistance (even without blood tests):

  • Intense sugar or carb cravings
  • Energy crashes after meals
  • Difficulty losing weight despite effort
  • Dark patches of skin (acanthosis nigricans), often on the neck or underarms
  • Feeling shaky, irritable, or anxious when meals are delayed

What You Can Do About It

The encouraging news is that insulin resistance is highly responsive to lifestyle changes. You don’t need to overhaul everything overnight — small, consistent shifts make a real difference.

Nutrition Strategies

  • Pair carbs with protein and fat. Never eat carbohydrates in isolation. Adding protein and fat slows glucose absorption and reduces the insulin spike. A banana alone will hit differently than a banana with almond butter.
  • Prioritise fibre. Aim for 25–30g per day from vegetables, legumes, and whole grains. Fibre slows digestion and improves insulin sensitivity.
  • Consider meal order. Emerging research shows that eating vegetables first, then protein, then carbohydrates — within the same meal — can reduce blood sugar spikes by up to 40%.
  • Reduce refined sugars and processed foods. These cause the sharpest insulin spikes and offer the least nutritional value.

Movement

You don’t need to do intense cardio every day. In fact, excessive high-intensity exercise can raise cortisol and potentially worsen symptoms. A combination approach works best:

  • Resistance training (2–3x per week) — builds muscle, which improves insulin sensitivity
  • Walking (daily, especially after meals) — a 15-minute post-meal walk can significantly lower blood sugar
  • Low-intensity movement — yoga, swimming, cycling at a comfortable pace

Sleep and Stress

These are underrated but critical. Poor sleep increases insulin resistance, and chronic stress raises cortisol, which in turn raises blood sugar. Aim for 7–9 hours of quality sleep and find stress management practices that work for you — even five minutes of deep breathing counts.

Supplements (With Guidance)

Some supplements have evidence supporting their use for insulin resistance in PCOS:

  • Inositol (myo-inositol + D-chiro-inositol) — one of the most well-researched supplements for PCOS insulin resistance
  • Berberine — shown to improve insulin sensitivity in several studies
  • Magnesium — many women with PCOS are deficient, and magnesium supports glucose metabolism
  • Chromium — may help improve insulin sensitivity at appropriate doses

Always discuss supplements with your healthcare provider, especially if you’re on medication.

The Bottom Line

Insulin resistance isn’t a personal failing or the result of eating “wrong.” It’s a metabolic feature of PCOS that affects the majority of women with the condition. Understanding it is the first step to managing it — and managing it can improve nearly every PCOS symptom.

If you’re unsure whether insulin resistance is playing a role in your symptoms, take our free PCOS type quiz to identify your pattern and get personalised nutrition guidance. You can also join the Nouri waitlist for early access to an AI nutrition coach built specifically for women with PCOS.