Highlights
- It is not a discipline problem. Up to 75 per cent of women with PCOS have insulin resistance, regardless of their starting weight. This is a measurable metabolic difference, not a lack of willpower.
- Insulin resistance and PCOS feed each other. High insulin levels worsen the hormonal imbalance that defines PCOS, and that hormonal imbalance makes insulin resistance worse. Breaking the cycle is the actual goal, not the number on the scale.
- Targeted approach to address insulin. Standard weight-loss advice does not account for the metabolic resistance that PCOS creates. A targeted approach addressing insulin directly tends to work where general advice has not.
- Metformin is not a weight loss drug, but it can help. It is recommended for the metabolic features of PCOS, in combination with lifestyle changes, not as a replacement for them.
You have probably been told to eat less and move more. You have probably tried it, more than once, with real discipline. And you have probably watched it not work the way it was supposed to.
That is not a failure on your part. It is a sign that the advice you were given did not account for what is actually happening in your body.
PCOS does not just affect your cycle. It changes how your body processes sugar, stores fat, and regulates hunger. The piece that almost never gets explained properly is insulin, and once you understand it, a lot of what has felt confusing about your weight starts to make sense.
At Menovivre, we often see this conversation play out: years of being told to simply try harder, with no explanation of the metabolic resistance working against that effort. This article explains what insulin resistance actually does in PCOS, why it makes weight loss harder, and what genuinely helps.
Quick Answer
PCOS weight gain is driven primarily by insulin resistance, a condition in which the body’s cells respond poorly to insulin, forcing the pancreas to produce more of it.
High insulin levels promote fat storage, particularly around the abdomen, increase hunger, and stimulate the ovaries to produce excess androgens, which further disrupts metabolism. This affects up to 75 per cent of women with PCOS, at any starting weight.
Standard calorie-restriction advice often fails because it does not address this underlying resistance. Effective management combines targeted nutrition, strength-based movement, and, where appropriate, medication such as metformin, under proper clinical guidance.
What Insulin Resistance Actually Means
Insulin is the hormone that allows your cells to take in glucose from the bloodstream and use it for energy. In insulin resistance, your cells stop responding to insulin efficiently. Glucose has a harder time getting into the cells, so your pancreas compensates by producing more insulin to force the message through.
The result is chronically elevated insulin levels, even when blood sugar itself looks normal on a standard test. This is why insulin resistance can go undetected for years: many routine checks measure glucose, not insulin, and by the time glucose is affected, the resistance has often been present for a long time.
This matters enormously in PCOS. Insulin resistance or elevated insulin levels can worsen androgen excess, one of the defining features of PCOS, and signs of it include weight gain, particularly around the waist, alongside skin changes such as darkened patches and skin tags. Research suggests insulin resistance affects up to 75 per cent of women with PCOS, including many who are not classified as overweight.
The Cycle: How Insulin and PCOS Reinforce Each Other
This is the part that rarely gets explained clearly, and it is the part that matters most.
High insulin levels do not just affect blood sugar. They directly stimulate the ovaries to produce more androgens, including testosterone. This occurs because insulin and luteinising hormone act on shared pathways in ovarian tissue, and elevated insulin levels amplify the ovaries’ androgen output.
The excess androgens then disrupt ovulation, contribute to irregular cycles, and drive symptoms including acne and excess hair growth. They also promote fat storage specifically around the abdomen, a pattern that is metabolically different from fat stored elsewhere and that itself worsens insulin resistance further.
In other words: insulin resistance worsens the hormonal picture of PCOS, and the hormonal picture of PCOS worsens insulin resistance. It is a closed loop, and it is precisely why generic weight loss advice, designed for someone without this loop, so often falls short.
The Cycle at a Glance
Why PCOS Weight Tends to Settle Around the Abdomen
Many women with PCOS notice that weight accumulates disproportionately around the abdomen, even when their overall weight has not changed dramatically. This is not incidental. Research has found that women with PCOS show preferential abdominal fat accumulation that promotes insulin resistance through increased visceral fat mass, and this pattern occurs across a wide range of body weights, including in women who are not classified as overweight by BMI.
Visceral fat, the fat stored around the internal organs, is more metabolically active than fat stored elsewhere, and it further worsens insulin sensitivity. This creates a particular kind of frustration: the scale may not move much, but the way weight is distributed changes in ways that feel disproportionate to any change in habits.
What Actually Helps: Addressing Insulin Directly
Care should focus on overall health rather than weight as an isolated target, with weight bias and stigma minimised throughout. This matters. The goal is not punishment. It is addressing the actual mechanism.
Nutrition that targets insulin, not just calories
A lower glycaemic load approach, prioritising protein, fibre, and healthy fats while moderating refined carbohydrates, helps reduce the insulin spikes that drive the PCOS cycle. This is a different goal from simple calorie restriction. The aim is steadier blood sugar and lower circulating insulin, which in turn reduces androgen stimulation and supports more typical fat distribution over time.
Movement that builds muscle, not just burns calories
Resistance and strength training improves insulin sensitivity directly, because muscle tissue is one of the primary sites of glucose uptake in the body. More muscle mass means more capacity to clear glucose from the bloodstream efficiently, which reduces the burden on the pancreas and lowers circulating insulin over time.
Sleep and stress, which are not afterthoughts
Poor sleep and chronic stress both raise cortisol, and elevated cortisol worsens insulin resistance. For many women with PCOS, addressing sleep quality and stress load is not a peripheral wellness suggestion. It is a direct lever on the same metabolic pathway driving the weight gain.
Medication, where appropriate
Metformin, alongside lifestyle changes, is recommended for adults with PCOS and a BMI of 25 or above to help prevent and manage weight gain and metabolic features. It improves insulin sensitivity at the cellular level rather than acting as an appetite suppressant or fat burner. It works alongside lifestyle change, not instead of it, and is not appropriate or necessary for every woman with PCOS. Whether it is right for you depends on your individual metabolic picture.
This Is Not About Trying Harder
If you have spent years feeling like your body was working against every reasonable effort, that feeling has a basis. PCOS creates a genuine metabolic resistance, and addressing it properly starts with understanding it, not with another round of willpower.
At Menovivre, we assess the full picture: insulin levels, hormonal profile, metabolic markers, and your individual symptoms, before building a plan. If you would like to understand more about how hormones interact more broadly in women’s health, our guide to midlife hormones is a useful place to start.
If PCOS has made your relationship with weight feel confusing or unfair, we would like to help make sense of it with you.
Frequently Asked Questions
Q1: Why is it so hard to lose weight with PCOS?
Q2. Does metformin help with PCOS weight loss?
Q3. What diet actually works for PCOS?
Q4. Can you have PCOS and insulin resistance without being overweight?
Q5. Why does PCOS weight settle around the stomach specifically?
Q6. How do I know if I have insulin resistance?
Q7. Do I need to lose weight to manage PCOS?
Q8. Do I need a referral to be seen at Menovivre?
Dr. Aarti Javeri-Mehta
Physician – Specialist – Internal Medicine
