PMOS (Polyendocrine Metabolic Ovarian Syndrome), a Functional Approach.

Polyendocrine Metabolic Ovarian Syndrome (PMOS) is the newly defined term for the condition previously known as Polycystic Ovary Syndrome (PCOS), following a global consensus published in The Lancet in May 2026. The updated terminology reflects a broader and more accurate understanding of the condition as a complex, multisystem disorder, rather than an isolated ovarian condition.

The previous term ‘PCOS’ has been recognised as misleading, as it implies the presence of ovarian cysts, which are not a defining feature. This has historically contributed to delayed diagnosis, fragmented care, and a narrowed clinical focus on the ovaries rather than the wider drivers involved.

PMOS provides a more useful framework, recognising the condition as involving -

• Polyendocrine – involving multiple hormonal systems, including insulin, androgens, and brain-ovary signalling
• Metabolic – highlighting the central role of insulin resistance and long-term cardiometabolic health
• Ovarian – acknowledging effects on ovulation, menstrual cycles, and fertility.

This updated model aligns closely with a functional medicine approach, which views the condition as a whole-body network of imbalances rather than a single-organ disorder.

Clinical Presentation

PMOS presents with a broad and highly individual symptom picture. Common features may include irregular or absent menstrual cycles, ovulatory dysfunction, acne, hirsutism, hair thinning, fatigue, weight gain or difficulty losing weight, blood sugar instability, mood changes and digestive issues.

Longer-term considerations may include metabolic dysfunction, cardiovascular risks, fatty liver, thyroid imbalance, autoimmune associations, and sleep disturbances. These wider features reinforce the need to move beyond an ovarian only few of the condition.

Core Functional Drivers of PMOS

Rather than a single cause, PMOS is best understood as a network of interacting physiological imbalances.

Metabolic Dysfunction & Insulin Resistance

Insulin resistance sits at the centre of PMOS. Elevated insulin levels can stimulate ovarian androgen production while reducing levels of sex hormone-binding globulin (SHBG), increasing the amount of active testosterone in circulation.

Supporting insulin sensitivity is therefore a key priority. Alongside dietary strategies, nutrients such as magnesium may support glucose regulation and nervous system balance, while chromium can help with blood sugar control. Alpha lipoic acid Berberine may also be useful where metabolic dysfunction is more pronounce, helping to improve insulin signalling and overall metabolic health.

N-acetyl cysteine (NAC) can offer antioxidant support while also playing a role in insulin sensitivity and metabolic regulation. Addressing inflammation alongside blood sugar balance is important.

Hormone Dysregulation and Androgen Activity

Hormonal imbalance reflects disruption across multiple systems rather than the ovaries alone. Increased androgen activity may arrive from higher production, reducing binding, or altered metabolism.

Supporting this area involves influencing both hormone levels and hormone activity. Zinc plays a role in hormone regulation and enzyme activity, including pathways involved in androgen conversion. Vitamin D is also important for endocrine signalling and may support sex hormone binding globulin (SHBG) levels, helping to regulate free testosterone.

Botanical ingredients such as saw palmetto, may be used within a broader strategy to support androgen balance (testosterone, DHT) and hormone signalling. NAC also appears relevant again in this area, particularly where ovulatory function and androgen burden are concerns.

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Hormone Conversion & Oestrogen Signalling

A key feature of PMOS is not just hormones levels, but how hormones are processed and converted within the body. Reduced conversion of androgens into oestrogen may contribute to dysfunction of the ovaries and irregular cycles.

Supporting this process involves looking at the wider metabolic environment. Adequate nutrient status is important, and iron status (balanced with zinc and copper), where clinically appropriate, may influence certain enzyme systems involved in hormone conversion. Improving insulin sensitivity and reducing inflammatory burden also supports a more balanced hormone signalling overall.

Chronic Inflammation & Oxidative Stress

Low-grade inflammation is a common driver in PMOS and can influence both metabolic and hormonal pathways. This may be linked to blood sugar dysregulation, gut dysfunction, stress, or environmental exposures.

Supporting antioxidant capacity can be helpful here. NAC plays a central role through its involvement in glutathione production, while curcumin may help modulate inflammatory pathways.

Gut Microbiome & Hormone Regulation

Changes in the microbiome, impaired barrier function and altered digestive health may influence inflammation, insulin sensitivity and hormone recycling, making the gut-metabolic-hormone connection highly relevant when looking at the drivers behind PMOS

Emerging research highlights the role of the gut microbiome in PMOS. Changes may include –

• Reduced microbial diversity
• Lower production of beneficial short-chain fatty acids (SCFAs)
• Increased gut permeability
• Greater exposure to inflammatory compounds such as lipopolysaccharides (LPS) – known as endotoxins

These changes may influence insulin resistance, inflammation, and hormone metabolism.

An important SCFA is butyrate, which is produced by our beneficial gut bacteria through the fermentation of dietary fibre. Butyrate helps to support the integrity of the gut lining, regulate immune functions, and reduce inflammatory signalling, all of which are relevant in PMOS

Supporting gut health through diet, improving bile flow, fibre intake, and microbiome balance may therefore play a crucial role in overall support strategies.

Additionally compounds such as calcium D-glucarate may help to support hormone clearance pathways. Found abundantly in foods such as cruciferous vegetables (Broccoli, cabbage, cauliflower etc), fruits, and various other vegetables as well as in supplemental form.

Liver Function & Detoxification

The liver plays a central role in hormone metabolism and detoxification, if hormone clearance is impaired, this can contribute to ongoing imbalances. However, the elimination of used hormones and other compounds is vital. Bile flow and bowel function play a critical role here, as they support the movement of these compounds out of the body. If elimination pathways are sluggish, hormones may be reabsorbed and recirculation, adding to the overall imbalance.

Our environment has been overwhelmed with endocrine-disrupting chemicals such as BPA, phthalates, and dioxins that can influence hormone signalling.

These compounds can –

• Interfere with oestrogen receptor activity
• Disrupt hormone signalling pathways
• Potentially affect the enzymes involved in hormone conversion (Aromatase enzymes)

While not the sole cause, environmental load may contribute to symptoms in those with increased susceptibility, particularly where other drivers such as metabolic dysfunction, inflammation or gut imbalance are already present.

For this reason, supporting the body’s natural processing and elimination pathways is important. A focus on detoxification and elimination through diet and lifestyle, alongside supporting liver function, bile and lymphatic flow and regular bowel movements can help to reduce the re-circulation of hormones and unwanted compounds.

Importantly reducing exposure to these compounds is important such as plastics, personal care products, make-up, perfume etc.

Stress Response & Circadian Rhythm

Altered stress physiology is common in PMOS. Changes in cortisol rhythm can influence insulin sensitivity, inflammation and hormone balance.

Supporting the nervous system is therefore an important part of a broader strategy. Magnesium and adequate B vitamins may be helpful in this regard, supporting relaxation, sleep, and stress resilience. Addressing sleep quality and circadian cycles can have a positive impact across metabolic and hormonal pathways. 

PMOS, A Whole-Body Framework for Support

With all the variable factors, PMOS represents a shift away from viewing this condition as ‘just hormonal’ or ‘just reproductive’. Instead, it highlights a complex interaction between metabolism, hormones, inflammation, gut health and lifestyle factors

From a practical perspective, this means that effective support strategies often benefit from a multi-system approach including –

• Supporting insulin sensitivity and metabolic health
• Addressing hormone balance and ovary function
• Improving gut health and microbiome diversity
• Reducing inflammatory load
• Support stress resilience and sleep
• Minimising exposure to endocrine disruptors where possible, (plastics, linings of canned foods and drinks, takeaway packaging and processed food containers, skin care, cosmetics, fragrances, pesticides and more)

The transition from PCOS to PMOS is a welcomed but long-overdue shift in recognising the true complexity of this condition. It moves the conversation beyond a narrow ovarian focus and towards a more integrated, systems-based understanding. Notably, this is a perspective that functional medicine practitioners and nutritionists have long recognised, identifying the interconnected roles of metabolism, hormones, gut health, and inflammation well before this formal reclassification.

This evolving model now opens the door to more personalised, comprehensive approaches, combining targeted supplementation with dietary strategies such reduced glycaemic load & inflammatory foods, increased fibre, fermented foods, lean proteins and healthy fats alongside key lifestyle to support long term health and wellbeing.

References

Di Lorenzo M, Cacciapuoti N, Lonardo MS, Nasti G, Gautiero C, Belfiore A, Guida B, Chiurazzi M. Pathophysiology and Nutritional Approaches in Polycystic Ovary Syndrome (PCOS): A Comprehensive Review. Curr Nutr Rep. 2023 Sep;12(3):527-544

Johnson C, Garipoğlu G, Jeanes Y, Frontino G, Costabile A. The Role of Diet, Glycaemic Index and Glucose Control in Polycystic Ovary Syndrome (PCOS) Management and Mechanisms of Progression. Curr Nutr Rep. 2025 Jan 3;14(1):8

Rudnicka E, Suchta K, Grymowicz M, Calik-Ksepka A, Smolarczyk K, Duszewska AM, Smolarczyk R, Meczekalski B. Chronic Low Grade Inflammation in Pathogenesis of PCOS. Int J Mol Sci. 2021 Apr 6;22(7):3789.

Feng X, Xiao J, Wang D, Fu X, Gao J, Jiang M, Li J, Jiang L, Liang X, Huang Y, Jiang Q. Butyric acid ameliorates PCOS-related reproductive dysfunction through gut-brain-ovary axis signaling and ovarian steroidogenic factor activation. Front Endocrinol (Lausanne). 2025 Jul 9;16:1604302

Leung WT, Tang Z, Feng Y, Guan H, Huang Z, Zhang W. Lower Fiber Consumption in Women with Polycystic Ovary Syndrome: A Meta-Analysis of Observational Studies. Nutrients. 2022 Dec 12;14(24):5285.

Srnovršnik T, Virant-Klun I, Pinter B. Polycystic Ovary Syndrome and Endocrine Disruptors (Bisphenols, Parabens, and Triclosan)-A Systematic Review. Life (Basel). 2023 Jan 4;13(1):138.

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(26)00717-8/fulltext