Why your PCOS is not your fault

PCOS is now PMOS — why the name change matters and what it means for your hormones

If you’ve been told that PCOS is “just a period problem” or that losing weight will fix everything — you deserve a much better explanation than that. And as of May 2026, even the medical world agrees: the name itself needed to change.

PCOS — or as it is now officially known, PMOS (Polyendocrine Metabolic Ovarian Syndrome) — is one of the most common hormonal conditions affecting women of reproductive age, yet it remains one of the most misunderstood, both by the women living with it and, too often, by the healthcare system meant to support them.

In this post, I want to give you the explanation I wish someone had given me: a clear, honest breakdown of what’s actually happening in your body, and what you can do to start working with it.

Why it matters

On 12 May 2026, following more than a decade of research and input from around 22,000 doctors, researchers, patients, and advocacy groups worldwide, PCOS was formally renamed PMOS — Polyendocrine Metabolic Ovarian Syndrome. The consensus was published in The Lancet and backed by 56 major medical and patient organisations, including the Endocrine Society and Verity (PCOS UK).

The old name — Polycystic Ovary Syndrome — put the focus on ovarian cysts. But those aren’t pathological cysts, and they aren’t driving the condition. That single mischaracterisation contributed to decades of missed diagnoses, dismissive treatment, and women being told “there’s nothing wrong with your ovaries” and sent away without answers.

The new name tells a far more accurate story. Here’s what it means:

Polyendocrine — it involves multiple endocrine (hormone-producing) systems, not just the ovaries.

Metabolic — it fundamentally affects the way your body processes energy, insulin, and nutrients.

Ovarian — yes, the ovaries are involved. But they are not the cause.

Both PCOS and PMOS will be used interchangeably during a three-year transition period, so you’ll continue to see both terms — including throughout this website. But understanding what PMOS stands for changes everything about how we approach this condition. It is primarily a hormonal and metabolic disorder. It affects:

•        Androgen levels (male hormones like testosterone)

•        Oestrogen and progesterone balance

•        Cortisol (your stress hormone)

•        Thyroid function (for some women)

•        Gut health and inflammation

All of these systems are interconnected. When one is disrupted, the others feel it. This is why PMOS symptoms are so wide-ranging — and why a one-size-fits-all approach rarely works.

The insulin-androgen cycle: understanding the root cause

For around 70-80% of women with PMOS, insulin resistance plays a central role. Here’s how the cycle works:

•        Your cells become resistant to insulin, meaning your pancreas has to produce more and more of it to do the same job

•        High insulin levels signal your ovaries to produce excess androgens — particularly testosterone

•        Elevated androgens suppress ovulation, leading to irregular or absent periods

•        Without regular ovulation, your oestrogen and progesterone balance is disrupted

•        This hormonal imbalance contributes to symptoms like acne, hair thinning, mood changes, weight gain and fatigue

•        Meanwhile, the hormonal disruption and resulting lifestyle stress can worsen insulin sensitivity further — and the cycle continues

Understanding this cycle is empowering, because it means there are real, evidence-based points of intervention — particularly through nutrition.

Why standard diet advice often fails women with PMOS

The conventional "eat less, move more" advice is based on a simple calorie model. But for women with insulin resistance, this model is incomplete.

Restricting calories without addressing blood sugar balance can increase cortisol, worsen insulin resistance, and trigger binge-restrict cycles that make symptoms worse — not better.

This is not a willpower issue. It is a biology issue. And it is one of the reasons so many women with PMOS feel like they are failing when they are just following the wrong advice.

What your body really needs

Supporting PMOS through nutrition is about working with your hormonal biology, not against it. The key principles are:

•        Blood sugar stability. Prioritise protein, healthy fats, and fibre at every meal to slow glucose absorption and reduce insulin spikes.

•        Anti-inflammatory foods. Chronic low-grade inflammation is common in PMOS. Omega-3s, colourful vegetables, and polyphenol-rich foods help address this.

•        Regular, nourishing meals. Skipping meals raises cortisol and destabilises blood sugar. Eating consistently is not optional — it is therapeutic.

•        Gut health support. Emerging research links gut microbiome health to hormonal balance in PMOS. Fermented foods and prebiotic fibre matter.

What about supplements?

Certain micronutrients have a well-established evidence base for supporting women with PMOS — including inositol, magnesium, vitamin D, zinc, and N-acetyl cysteine (NAC). We’ll be covering these in detail in a future post.

If you’d like to be notified when that goes live, make sure you’re signed up to our newsletter.

Your next step

If you’re not already using our free symptom and food planner, this is a great place to start. The daily tracker will help you begin noticing patterns — how your energy shifts after meals, when your symptoms are worst, and what might be influencing them. (We’ve kept the PCOS name in the planner title during the transition period — you may see both PCOS and PMOS used across our content.)

Also, click here for our Free 5-day PCOS reset guide.

And if you have questions about anything I’ve covered in this post, please do get in touch. I’m always happy to help.

Laura-Kate

Founder & Nutritional Coach, LK Mama Nutrition

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