Temel Bilgiler
Insulin resistance and PCOS: why metabolic health matters
Insulin resistance is very common in PCOS and can occur at any weight. How it affects symptoms, how it is checked and which steps really help.
Published · 6 min read
Maybe you heard the term "insulin resistance" from your doctor or on social media and are wondering what it really means. It is one of the keys to understanding PCOS. The good news: once you understand it, the steps you can take to manage it become much clearer.
In short: Insulin resistance is very common in PCOS and can occur at any weight, not only in women with extra weight [1, 2]. High insulin can raise androgens, disturb the cycle and, over time, increase the risk of type 2 diabetes [2]. Regular movement, balanced eating and regular check-ups are the main ways to manage that risk [1, 3].
What is insulin resistance?
Insulin is a hormone made by the pancreas that lets sugar in the blood enter the cells. When you eat, your blood sugar rises, the pancreas releases insulin, and the sugar is moved into your muscles, liver and other tissues.
With insulin resistance, cells respond less to insulin. The body makes up for it by producing more. For a while blood sugar can stay normal, but the price is a constantly high level of insulin in the blood.
A simple comparison
Think of insulin as a key and your cells as locked doors. With insulin resistance the locks are a little rusty, so it takes more keys to open them. The pancreas copes for a while by making extra keys, but this affects the rest of the body too.
How is it linked to PCOS?
Insulin resistance is very common in PCOS and occurs not only in women with extra weight but also in women of normal weight [1]. High insulin in the blood can:
- Push the ovaries to make more androgens. Androgens are often called "male hormones", but women naturally have them too. An excess can worsen acne, unwanted hair and thinning hair.
- Disturb ovulation, lengthen the cycle and contribute to irregular periods.
So insulin resistance may fuel some PCOS symptoms. That is why focusing on metabolic health matters not only for long-term risk but also for how you feel today.
Why it matters in the long term
A meta-analysis found that women with PCOS have a several times higher, roughly 2–4 fold, risk of impaired glucose tolerance (blood sugar coming down more slowly than normal) and type 2 diabetes. The risk stayed higher independent of BMI (body mass index) [2]. Whatever your weight, keeping an eye on your blood sugar is important.
Pregnancy is a separate topic. In PCOS the risk of gestational diabetes is higher [1], so if you are planning a pregnancy it helps to discuss your metabolic health in advance.
How is it checked?
Insulin resistance often causes no obvious symptoms, which is why regular check-ups matter. The 2023 guideline recommends [1]:
| Test | When? |
|---|---|
| 75 g oral glucose tolerance test (OGTT) | At diagnosis, then every 1–3 years depending on risk |
| OGTT around pregnancy | When planning pregnancy; if not done, at the first antenatal visit and at 24–28 weeks |
| Blood fats (cholesterol etc.) | At diagnosis, then depending on risk |
| Blood pressure | Every year and when planning pregnancy |
For an OGTT, blood is usually taken in the morning after fasting, you then drink a sugary liquid, and blood is taken again two hours later. The guideline says this is the most accurate test of blood sugar status, regardless of weight [1].
What helps
Movement
Working muscles use blood sugar more easily, and regular exercise improves insulin sensitivity [1]. The guideline and the World Health Organization recommend for adults [1, 4]:
- At least 150 minutes of moderate activity a week (such as brisk walking) or 75 minutes of vigorous activity, or a mix of both.
- Muscle-strengthening exercise on 2 days a week, ideally not back to back.
- Less time sitting, broken up with short walks.
These targets can feel big at first. Even 10-minute walks a day are a good start.
Eating
According to the guideline, no single diet has been shown to be better than others for PCOS [1]. What matters is a pattern that suits you and that you can keep up. Meals with fibre, protein and healthy fats can soften blood sugar swings. Balancing your plate usually works better in the long run than strict bans.
The effect of lifestyle
A Cochrane review found that lifestyle changes can improve insulin resistance and androgen-related outcomes in women with PCOS, although the quality of the evidence is low [3]. In women with excess weight, losing 5–10% of body weight can bring some benefits [1]. But this is not a goal for everyone. PCOS occurs at every weight, and weight stigma is both common and harmful [1]. If you do not want to be weighed, you have every right to say so.
Sleep and stress
Poor sleep and ongoing stress can affect insulin sensitivity. Regular sleep times and ways of relaxing that work for you support your overall health.
Medicines and supplements
- Metformin: the guideline recommends metformin mainly for metabolic features [1]. In head-to-head comparisons it may improve waist-hip ratio and unwanted hair more than inositol [6]. It may also support ovulation, but stomach and gut side effects are common [5].
- Inositol: the guideline says it "could be considered", but the evidence is limited and inconclusive [1, 6].
- Weight-loss medicines: medicines such as liraglutide, semaglutide and orlistat could be considered for adults together with lifestyle changes, but not when pregnancy is planned [1].
Decide with your doctor which option, if any, is right for you.
What you can do
- Ask about a blood sugar test: if you have never had an OGTT, ask your doctor about it and how often it should be repeated.
- Set a small movement goal: for example, walk for 15 minutes on three days this week, and build up as you get used to it.
- Add two strength days a week: simple bodyweight exercises at home count too.
- Break up sitting time: get up and move for a few minutes every hour.
- Balance your plate: try adding a source of protein and some vegetables to your meals.
- Check before taking supplements: if you are considering one, talk to your doctor or dietitian first.
Frequently asked questions
I am a normal weight. Can I still have insulin resistance?
Yes. In PCOS, insulin resistance also occurs in women of normal weight, and the risk of type 2 diabetes is higher independent of weight [1, 2]. That is why blood sugar checks are recommended at every weight.
Does insulin resistance go away completely?
Insulin resistance is part of the biology of PCOS, so no one can promise it will disappear completely. But insulin sensitivity can be improved with movement, eating patterns and, when needed, medicines [1, 3]. The goal is not perfection but a balance you can sustain.
Do I have to give up sugar completely?
No, there is no such requirement. The guideline does not find any one diet better than the others [1]. Building a pattern you enjoy, together with a dietitian, is often more sustainable than strict rules.
Should I take inositol?
The evidence for inositol is limited and inconclusive for now [6]. The guideline sees it as an option that "could be considered" [1]; compared with metformin it may do less for waist-hip ratio and unwanted hair, though it causes fewer stomach side effects [6]. It is best to talk to your doctor before taking it.
This article is for information only; talk to your doctor about diagnosis and treatment.
Sources
- Teede HJ et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS. Fertil Steril. 2023; 120(4): 767-793. PubMed
- Kakoly NS et al. Ethnicity, obesity and the prevalence of impaired glucose tolerance and type 2 diabetes in PCOS: a systematic review and meta-regression. Hum Reprod Update. 2018; 24(4): 455-467. PubMed
- Lim SS et al. Lifestyle changes in women with polycystic ovary syndrome. Cochrane Database Syst Rev. 2019; 3: CD007506. Cochrane
- World Health Organization. WHO guidelines on physical activity and sedentary behaviour. 2020. WHO
- Morley LC et al. Insulin-sensitising drugs (metformin, rosiglitazone, pioglitazone, D-chiro-inositol) for women with PCOS, oligo amenorrhoea and subfertility. Cochrane Database Syst Rev. 2017; 11: CD003053. Cochrane
- Fitz V et al. Inositol for PCOS: a systematic review and meta-analysis to inform the 2023 update of the International Evidence-based PCOS Guidelines. J Clin Endocrinol Metab. 2024; 109(6): 1630-1655. PubMed
