Many women with PCOS have insulin resistance, a state in which the body’s cells become less responsive to insulin, so the pancreas is forced to produce more of it to keep blood sugar within a normal range. These higher insulin levels are what often worsen PCOS symptoms, including irregular periods, hormonal acne, and difficulty losing weight. Understanding this link helps you have a more meaningful conversation with your doctor, rather than diagnosing yourself. This page is the main guide for our insulin resistance topic, giving you the big picture before connecting you to specific articles on testing, nutrition, supplements, and fasting.

What Insulin Resistance Is and Why It Matters

Insulin is a hormone released by the pancreas to help sugar (glucose) move into your muscle, liver, and fat cells to be used for energy or stored. When these cells become “resistant” or less sensitive, glucose has a harder time getting in, so the pancreas responds by releasing even more insulin. Early on, this strategy works, and your blood sugar still looks normal on standard tests. What is high at this stage is the insulin level, not the sugar. That is why insulin resistance can exist silently for years before blood sugar truly rises and type 2 diabetes appears.

For women with PCOS, this is not just about energy or weight. Excess insulin stimulates the theca cells in the ovaries to produce more androgens, hormones such as testosterone. At the same time, high insulin lowers a protein called SHBG (sex hormone-binding globulin), which is supposed to bind excess testosterone in the blood. When SHBG drops, more “free” testosterone circulates, and this contributes to excess hair (hirsutism), hormonal acne, and oily skin. High insulin also disrupts the signalling between the brain and the ovaries, contributing to irregular ovulation and delayed periods. Organisations such as Diabetes Malaysia also explain this two-way link, where insulin resistance worsens PCOS, and PCOS in turn raises the risk of blood-sugar problems.

It is important to remember a nuance that is often misunderstood: not all women with PCOS have insulin resistance, and it is not your fault. The 2023 international PCOS guideline recognises insulin resistance as a common core feature, but not as a diagnostic criterion. Genetics, lifestyle, sleep, stress, and weight all play a part. While excess weight can worsen insulin resistance, many lean women with PCOS (sometimes called “lean PCOS”) experience it too. This means you cannot judge someone’s insulin resistance simply by looking at their body size.

Signs and Symptoms You Can Notice

Insulin resistance itself has no single definitive symptom, but several clues often appear and are worth bringing up with your doctor:

  • Acanthosis nigricans, patches of skin that look darker and “dirty” even after washing, usually on the back of the neck, armpits, or skin folds. This is one of the most visible skin signs of insulin resistance.
  • Skin tags, small soft growths around the neck and armpits.
  • Hunger that returns quickly or cravings for carbohydrates and sugar, especially after a meal high in simple carbs.
  • Post-meal fatigue, feeling sleepy or “foggy” a few hours after a large meal.
  • Stubborn fat around the abdomen that is harder to shift than elsewhere.

These signs do not confirm anything on their own, and many people without PCOS have them too. They are simply prompts for a conversation, not a diagnostic tool. If you have more serious high blood-sugar symptoms such as extreme thirst, frequent urination (especially at night), unexpected weight loss, unusual fatigue, or blurred vision, see a doctor promptly for proper blood-sugar testing, without waiting for any additional tests.

Tests You Can Discuss With Your Doctor

There is no single perfect test for insulin resistance, and this is worth understanding honestly. Your doctor may order some of the following, but interpretation should be left to them because reference ranges differ between laboratories.

Fasting insulin measures your insulin level after fasting and gives an early clue. The HOMA-IR score combines fasting insulin and blood sugar into a single estimate. Both are useful for a rough picture and for tracking change over time, but they have limits: insulin assays are not standardised between labs, and a single reading can vary considerably.

To assess true blood-sugar risk, the oral glucose tolerance test (OGTT) and HbA1c are more reliable and standardised. This is why the 2023 international PCOS guideline actually does not recommend measuring insulin resistance (such as fasting insulin or HOMA-IR) as routine screening, because these measurement methods are not accurate enough for everyday clinical use. Instead, OGTT and HbA1c are preferred to assess diabetes risk. So if you are not given a fasting insulin test at a government clinic, that aligns with the guideline rather than being an oversight. For women who want ongoing insight into their blood sugar, some also try continuous glucose monitoring (CGM) in Malaysia, though this is an optional extra and not a requirement.

Questions to ask your doctor

To make your 30-minute consultation more productive, you can ask: “Do I need an OGTT or HbA1c to assess my blood-sugar risk?”, “What do these results mean in the context of my ethnicity and age?”, “How often should I repeat metabolic tests?”, and “Should my weight, blood pressure, or lipid profile be monitored too?”. Bring a list of your symptoms over the past three months and a record of your menstrual cycles; this data is far more useful to a doctor than a single reading.

Nutrition and Lifestyle: The Most Meaningful Foundation

For PCOS-related insulin resistance, lifestyle change is the foundation with the strongest evidence, and it is usually recommended before any medication. It is not about a punishing strict diet, but about a pattern you can sustain for years.

Choosing low glycaemic index (GI) foods helps avoid sharp spikes in blood sugar and insulin. See our low-GI Malaysian foods guide for local choices such as brown or parboiled rice instead of white rice, oats instead of sweetened cereals, and whole fruit instead of juice. You do not need to give up your favourite foods entirely. Some practical steps that suit Malaysian meals: reduce the portion of white rice and add fibrous vegetables and protein (fish, chicken, eggs, tofu, tempeh) to every plate; treat kuih or dessert as occasional rather than daily; and be careful with sweet drinks like teh tarik, syrups, and packet drinks that raise blood sugar quickly. Meal order helps too, as starting a meal with vegetables and protein before carbohydrates can soften the blood-sugar spike.

Daily movement has a direct effect on insulin sensitivity. Active muscles take up glucose without needing much insulin, so combining resistance (strength) training two to three times a week with daily walking is very effective for women with PCOS. A short walk after meals, even 10 to 15 minutes, can help reduce post-meal blood-sugar spikes. Adequate, good-quality sleep also matters, because chronic sleep loss alone can worsen insulin resistance even if your diet is good. Stress management through calming routines helps too, because prolonged stress hormones affect blood sugar.

You do not need to change everything at once. One or two small, sustained changes, such as adding a daily walk and swapping sweet drinks for water, are more sustainable and more effective long term than a drastic overhaul that is hard to maintain.

Supplements: Honest Evidence, Not Promises

Among the supplements most often discussed for PCOS insulin resistance is inositol (a combination of myo-inositol and D-chiro-inositol, often in a 40:1 ratio). Several studies and meta-analyses suggest inositol may improve metabolic markers and ovulation regularity in some women, with a good safety profile. However, this evidence should be graded honestly as limited. The 2023 international PCOS guideline concludes that the evidence for inositol remains limited and inconclusive, such that no specific type, dose, or combination can be formally recommended. The guideline states inositol “could be considered” based on individual preference given its low potential for harm, but it is not a mandatory treatment and does not outperform metformin on evidence. If you are interested, see our page on myo + D-chiro inositol dosing for PCOS to understand the doses used in studies, and discuss it with your doctor or pharmacist first, especially if you are pregnant, breastfeeding, or taking other medication.

Omega-3 (fish oil) has moderate evidence for improving some metabolic and inflammatory markers in women with PCOS, and it is good for general heart health, but it is not a primary treatment for insulin resistance. Other supplements such as berberine are often promoted as “natural metformin”, but please read the next section before considering it.

For all supplements in Malaysia, check the NPRA registration status (the MAL number on the pack), check the gelatin source on softgel capsules to confirm halal status, and remember that “natural” does not mean free of risk or free of interactions. Any dose mentioned in a study is the dose used in research, not a personal prescription for you.

Medication: Metformin and Berberine

You may have heard about berberine versus metformin. Metformin is a prescription medicine that improves insulin sensitivity and is usually considered by doctors, especially for women with PCOS who have a higher BMI, prediabetes, or when lifestyle alone is not enough. The 2023 international PCOS guideline suggests metformin can be considered to improve metabolic measures and weight in certain contexts. It should only be started on a doctor’s advice, and most of its side effects (such as nausea or diarrhoea) can be reduced by starting at a low dose and taking it with food. Metformin is not for everyone, and the decision is based on your overall picture, not a single test value.

Berberine, in small studies such as Wei 2012 and An 2014, showed effects on insulin resistance comparable to metformin, but the evidence remains limited and short-term. Guidelines still favour metformin as the medication of choice. Berberine is also not suitable if you are pregnant, may be pregnant, or breastfeeding, because it can cross the placenta and has been linked to a risk of kernicterus in infants. It also affects liver enzymes that process many medications, so it can interact with other drugs and should not be combined with metformin without a doctor’s advice. If fertility is your goal, this is an important reason to avoid berberine.

Fasting During Ramadan With PCOS

For Muslim women who wish to fast, current evidence suggests PCOS hormones generally do not change significantly simply because of fasting, and many women with PCOS can fast safely. The main focus is keeping blood sugar stable, that is, choosing low-GI, protein-rich foods at sahur so energy lasts longer, avoiding overdoing sweet foods and drinks at iftar, and staying hydrated between iftar and sahur. For women taking metformin, the timing and dose of the medication may need adjusting during Ramadan, so this should be planned with a doctor in advance and not changed on your own. The full guide is at fasting during Ramadan with PCOS.

Long-Term Risks Worth Monitoring

The main reason insulin resistance matters in PCOS is its link to long-term health risks. Women with PCOS have a higher risk of type 2 diabetes, prediabetes, unhealthier lipid levels, high blood pressure, and future heart and blood-vessel problems. This is why periodic metabolic monitoring is worthwhile, even if your symptoms seem controlled today. These factors can be managed, and the steps that help insulin resistance (nutrition, movement, sleep, and moderate weight loss where relevant) are the same steps that protect your heart and blood sugar over the long term. To understand the full picture of PCOS, start with our what is PCOS guide, and if you have just been diagnosed, our newly diagnosed guide lays out the early steps clearly.

Malaysian Context and When to See a Doctor

In Malaysia, basic blood-sugar screening is easy to access. KKM Klinik Kesihatan charge about RM1 per visit for citizens, with specialist follow-up around RM5, and usually offer fasting glucose, HbA1c, or OGTT, the very tests recommended by guidelines. Fasting insulin and HOMA-IR are typically only available at private labs or clinics, and costs vary between providers, so check current prices with your chosen lab. For diagnosing PCOS, doctors in Malaysia can also use a transabdominal ultrasound as the first-line option for unmarried women, and PCOS can still be diagnosed without a transvaginal ultrasound.

For a first diagnosis, start with an obstetrician-gynaecologist. For severe insulin resistance, prediabetes, or a concurrent thyroid problem, also see an endocrinologist. For fertility, an obstetrician-gynaecologist or fertility specialist is appropriate. See our directory by city in Malaysia for options near you, and browse our supplements page for an honest evidence overview before buying any product. Again, if you have extreme thirst, frequent urination, unusual fatigue, or blurred vision, do not wait, get a doctor’s assessment promptly.