They’re renaming PCOS to PMOS. Why, you might ask? For decades women suffering with a range of symptoms, from excessive body hair, irregular periods, acne, pelvic pain (we could go on), have been told this essentially comes down to cysts on their ovaries. The catch? Many didn’t have them.
So now, science is catching up.
A landmark paper published in The Lancet has announced that PCOS will be renamed PMOS, Polyendocrine Metabolic Ovarian Syndrome. The change follows a 14-year international consensus process involving clinicians, researchers and women living with the condition. And while a name change might sound like administrative housekeeping, it carries real weight.
Why PCOS was always a problem
Polycystic Ovary Syndrome has been the clinical term since the 1930s but it’s always missed the point and now, modern experts are now arguing it’s actively misleading. Many women diagnosed with PCOS never had ovarian cysts at all, meaning they were set up for failure in the medical system from the start.
PMOS reflects what clinicians have been observing for years: that this is a complex endocrine and metabolic disorder affecting the entire body. It impacts women’s insulin resistance, glucose metabolism, chronic low-grade inflammation, altered hormone signalling and elevated long-term cardiometabolic risk. By focusing the name solely on fertility and ovarian function, the terminology narrowed clinical attention in a way that left many women under-supported.
As Nat, our in-house Registered Nutritionist, puts it: "The inclusion of 'metabolic' in PMOS reflects what we see clinically, that this is not just a reproductive condition, but a whole-body metabolic condition."
What this means medically
At the core of PMOS is insulin resistance. When the body becomes less responsive to insulin, higher levels are needed to regulate blood glucose. That elevated insulin can then stimulate increased androgen production from the ovaries, which contributes to the symptoms many women know well: acne, excess hair growth, irregular cycles and difficulty managing weight.
Research suggests that up to 70% of women with the condition experience some degree of insulin resistance, regardless of body weight. This helps explain why symptoms so often extend beyond the reproductive system and show up as fatigue, cravings, energy instability and mood fluctuations.
"For many women, symptoms like fatigue, cravings, weight changes and mood fluctuations are all interconnected through insulin and metabolic pathways," Nat explains. "When we improve blood glucose regulation and insulin sensitivity, we often see positive improvements across hormonal health, energy, mood and symptom management."
The NHS currently describes PCOS as a condition affecting how the ovaries work. Growing clinical evidence, however, highlights significantly increased long-term risk of type 2 diabetes, hypertension, elevated cholesterol and cardiovascular disease. The addition of "metabolic" in PMOS signals a gradual, yet considered, shift toward earlier metabolic intervention and more integrated preventative care.
Will anything actually change?
To avoid disappointment, it’s fair to say no, not immediately. Experts are clear that women are unlikely to see rapid changes in diagnosis or treatment pathways. The NHS is expected to continue using existing frameworks while research and guidelines continue to evolve. NICE guidelines already recommend lifestyle management including nutrition, physical activity and weight support as first-line care, but many women still experience delays in diagnosis and inconsistent access to structured metabolic support.
The most immediate impact of PMOS is likely to be a shift in awareness rather than clinical protocol, encouraging earlier recognition of insulin resistance and a more joined-up approach between metabolic and reproductive health services.
And there are bigger questions this raises. If PCOS can be renamed to better reflect its biological reality after 14 years of international consensus-building, does this open the door for other conditions disproportionately affecting women (endometriosis, fibromyalgia, chronic fatigue… the list goes on) to receive the same scientific re-examination? The UK Women's Health Strategy was released recently, full of intention but light on measurable action. Could PMOS be a catalyst for something more substantive? It's a valid question.
What this means for now
While clinical frameworks catch up, the practical tools available to women with PMOS are already well-evidenced. Nat outlines the key approaches:
Blood sugar stabilisation is foundational.
Building meals around fibre, protein and healthy fats reduces glucose spikes, improves satiety and supports more stable energy levels throughout the day. High-fibre carbohydrates, whole oats, quinoa, lentils, beans, vegetables and berries, slow glucose uptake and support gut health. Lean protein sources support satiety and metabolic stability. Healthy fats from olive oil, nuts, seeds, avocado and oily fish contribute to hormone production and help reduce systemic inflammation.
Gut health is also emerging as relevant.
Links between gut microbiome diversity, inflammation and insulin resistance suggest that dietary diversity matters. Fermented foods and prebiotic fibres may help support a healthier gut environment and indirectly benefit metabolic regulation.
Movement, particularly resistance training, is especially beneficial.
Skeletal muscle is one of the most metabolically active tissues in the body. Increasing muscle mass improves glucose uptake and insulin sensitivity, which can positively influence both metabolic and hormonal outcomes. Regular walking and daily movement also support blood sugar regulation and cardiovascular health.
Sleep and stress are not optional extras.
Poor sleep disrupts appetite-regulating hormones and worsens insulin resistance. Chronic stress elevates cortisol, which further impacts blood glucose control and hormonal balance. These systems are deeply interconnected.
Evidence-based supplementation may offer additional support for some women.
Myo-inositol has been studied for its role in improving insulin sensitivity and ovarian function. Vitamin D, omega-3 fatty acids, magnesium, chromium and B vitamins support metabolic, blood glucose, inflammatory and energy pathways.
But Nat is honest about where the real challenge lies. "We often assume people just need more information. But the reality is that lifestyle change is hard, especially when you're dealing with fatigue, hormonal fluctuations, cravings and the pressures of everyday life. Many women are managing all of this alongside often conflicting health advice and a lack of expert support. That makes behaviour change hard, complex and lonely."
Sustainable change, she emphasises, is ultimately about consistency, nourishment and realistic long-term habits, not restriction.
The bigger picture
The shift from PCOS to PMOS is more than a terminology update. It’s a long overdue recognition that metabolic health is central to this condition, and that reproductive symptoms are part of a wider systemic picture.
"This isn't just a name change," Nat concludes. "It's a recognition that metabolic health is not separate from reproductive health, it’s fundamental to it."
For the estimated one in ten women living with this condition, that acknowledgement matters. Whether it translates into meaningfully better care, earlier diagnosis, more integrated support, less years spent being told symptoms are normal, remains to be seen. But, naming something accurately is a good start to truly encouraging understanding.
This article is for educational purposes and does not constitute medical advice. If you have concerns about PCOS, PMOS or any aspect of your hormonal or metabolic health, please consult a qualified healthcare professional or Registered Nutritionist.
Want to learn more?
PCOS and Endometriosis: Women's Health Conditions That Are Still Dismissed
PCOS Explained: How you can take control - with Dr Frankie
A Nutritional Therapist’s Guide to Managing Your PCOS Symptoms
