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If you've been diagnosed with PCOS, someone has probably mentioned insulin, often in a rushed sentence at the end of the appointment while the next patient waited outside. It deserves more time than that. For many women with PCOS, insulin resistance is what ties together the irregular periods, the acne, the waist that won't budge and the diabetes that runs in the family.
Here's what we'd tell a friend. Insulin resistance is common in PCOS, even in slim women, and it pushes the ovaries to make more androgens. Ask the lab for fasting glucose, HbA1c, lipids and a fasting insulin. Then add protein to breakfast (a besan chilla, or curd with the poha), walk for ten minutes after dinner, do squats at home and protect your sleep.
What is PCOS, briefly?
Doctors diagnose polycystic ovary syndrome when at least two of three things are present. One is periods that are irregular or missing because you aren't ovulating regularly. Another is signs of raised androgens, such as acne or hair on the chin and upper lip (the kind that sends you to the parlour every fortnight). The third is ovaries with lots of small follicles on an ultrasound. Other causes have to be ruled out first. That two-of-three rule comes from the Rotterdam criteria, and the 2023 international guideline still uses it.
We'd point out one thing that follows from the rule, because it confuses a lot of people. You can have PCOS with a scan that looks normal, and a scan full of follicles doesn't settle it on its own.
It's common in India. A large study across several Indian regions, published in 2024, found PCOS in a substantial share of women of reproductive age, often with metabolic problems alongside it. Plenty of women only find out when they're being investigated for something else, often when they're trying to conceive.
How common is insulin resistance in PCOS?
Very common. Clamp studies are the most accurate way to measure how well the body responds to insulin, though they're done in research units and not at your neighbourhood lab. (Nobody is putting you on an insulin drip for a routine check-up.) A meta-analysis of them found women with PCOS were less insulin sensitive than women without it. The gap held after allowing for body-mass index, so weight doesn't explain it all.
That matters in India, where a lot of women with PCOS are told it'll sort itself out if they lose a few kilos. Slim women with PCOS can be insulin resistant too. Extra weight makes it worse, but a normal BMI doesn't rule it out. We'd still want a slim woman with PCOS to have her glucose and insulin checked before anyone tells her she's fine.
How does high insulin drive PCOS symptoms?
Take a hypothetical 26-year-old with a normal fasting sugar, a normal BMI, cycles that come every six to eight weeks and acne that two dermatologists haven't been able to clear. Her sugar looks fine because her pancreas is putting out extra insulin to keep it there. Her cells have stopped responding well, so they need more of it to do the same job.
That extra insulin doesn't only act on muscle and liver. In the ovaries it seems to boost androgen production, and in the liver it lowers SHBG, a protein that normally binds androgens and keeps them out of action. More free androgen means the jawline acne, the chin hairs that come back however often she gets them threaded (her parlour knows her by name), thinning at the parting and ovulation that keeps slipping. A review of the mechanisms lays out this loop, and researchers still debate parts of it.
It also explains why some women's cycles settle once insulin sensitivity improves. If your treatment so far has been entirely about periods and skin, it's fair to ask whether anyone has checked your insulin.
PCOS varies a great deal between women. Insulin resistance is a major thread for many, but not every woman with PCOS has it to the same degree.
What signs point to insulin resistance in PCOS?
Start with the skin. A dark, velvety band at the back of the neck or in the armpits, called acanthosis nigricans, is strongly associated with metabolic problems. It's easy to mistake for a tan line, or for dirt that won't come off however hard you scrub (and no amount of besan ubtan will shift it). Skin tags often sit alongside it.
Then look at your family and your waistline. If your mother or father has type 2 diabetes, tell your doctor. The same goes for weight that settles round the middle while your arms and legs stay slim, or an afternoon slump and sugar craving that feel out of proportion to what you've eaten.
None of these proves anything on its own, and plenty of women with insulin resistance have none of them. If you've got two or three, though, we'd ask for the blood tests in the next section instead of waiting to see.
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Which blood tests should women with PCOS ask about?
The 2023 international guideline recommends checking metabolic health in women with PCOS whatever they weigh. That means looking at how your body handles glucose, usually with fasting glucose, HbA1c or a glucose tolerance test, plus a lipid profile.
Fasting insulin and HOMA-IR often get added. They can be useful, but labs use different insulin assays and there's no single agreed cut-off. So we'd read them together and watch the trend over a few reports, and we wouldn't panic over one number printed in bold. The lipid profile tells you more than people expect. High triglycerides with low HDL is a pattern linked to insulin resistance in research on overweight adults.
A typical PCOS work-up in India tends to focus on the ultrasound and the reproductive hormones. If yours didn't include the metabolic side, ask for it. It can all come from one fasting blood sample, so book the earliest morning slot and skip the chai till after the needle.
Does insulin resistance raise long-term risks?
Yes, and it's the part that gets lost when every appointment is about periods and skin. Insulin resistance in PCOS raises the chance of prediabetes and type 2 diabetes later in life. The guideline asks for glucose to be checked regularly over the years, not just once at diagnosis.
Take a hypothetical woman diagnosed at 22, with a normal sugar that nobody checks again. By 35 she has two children, a desk job and a father with type 2 diabetes, and she's still going on a report from college (probably in a folder somewhere in her mother's almirah). We'd put a yearly reminder on your phone for an HbA1c or fasting glucose, because nobody else is likely to chase it while you feel fine.
Pregnancy is the other time it matters, because insulin resistance rises naturally while you're pregnant. If you're planning a baby and live with PCOS, tell your doctor before you start trying. They may want to check your glucose earlier than the usual pregnancy screening.
What helps insulin resistance in PCOS day to day?
The Cochrane review of lifestyle changes in PCOS found that diet and exercise programmes improved several features, including insulin resistance and body composition. The trials were smaller than we'd like, but they point the same way.
We'd start with breakfast, because that's where a lot of Indian days go wrong. A plate of poha or two slices of bread with chai is mostly starch. Add a bowl of curd, switch to a besan or moong dal chilla, or have eggs, and the rest of the morning usually goes better. After that, cut down on maida, bakery snacks and the sugar in your chai, eat more dal, vegetables and whole grains, and have fruit whole instead of as juice.
Movement matters as much as food. Exercise improves insulin sensitivity within a day, and strength training builds the muscle that clears sugar after meals. Squats, lunges and wall push-ups in the bedroom count, and so does a brisk walk round the colony after dinner.
The week of your period is where most routines fall apart, with cramps and low energy making exercise feel impossible. Easy days are fine then. A short walk or some stretching keeps the habit going, and the harder sessions can wait till you feel stronger.
Do sleep and stress matter in PCOS too?
Yes, though PCOS advice often skips them. In a controlled study, healthy men kept to about five hours of sleep a night for a week became noticeably less insulin sensitive. We can't see why women with PCOS would be spared, and plenty of them are fitting work, study, a long commute and family into a day with very little room left for sleep.
If you snore or feel sleepy all day, mention it to your doctor. A 2025 meta-analysis found obstructive sleep apnoea more common in women with PCOS, and it breaks up sleep all night, often without the sleeper knowing (the sister who shares your room will have opinions). Beyond that, the fixes are dull but useful. Keep a regular bedtime, make the room darker and charge the phone somewhere you can't reach from the pillow.
Stress mostly works through sleep, food and movement. A month of exams or a hard quarter at work usually means late nights, more biscuits at the desk and fewer walks, and each of those pushes insulin the wrong way. In a month like that we'd protect sleep first.
Should women with PCOS aim to lose weight?
If you're carrying extra weight, losing some of it tends to improve insulin resistance, and for many women it makes cycles more regular too. What you lose matters as much as how much. A crash diet of fruit and green tea (every family seems to have one aunt who swears by it) skimps on protein. It strips muscle along with fat, which leaves less tissue to handle blood sugar.
Protecting muscle while you lose weight takes enough protein and regular resistance work. In a vegetarian kitchen that means curd, paneer, dal, sprouts or eggs at every meal, plus squats and push-ups a few times a week. If you're slim with PCOS, weight loss isn't the point, and we'd spend the effort on building muscle and sorting out the plate and sleep.
We should say where we stand, since you're reading this on our site. Metaboliq is a doctor-led weight programme. The line we lead with is "Lose up to 20% of your body weight — and keep your muscle". Results vary; your doctor decides what is right for you. The muscle half is there for the reason above. It starts with a ₹1,699 blood test at home that a doctor reads in full, because in PCOS the right plan depends on what your glucose, insulin and lipids actually show.