Polycystic Ovary Syndrome (PMOS) is a common endocrine disorder in women of reproductive age, characterised by ovulatory dysfunction, hyperandrogenism, and polycystic ovarian morphology. A significant proportion of women with PMOS also exhibit insulin resistance, which is increasingly recognised as a central mechanism influencing both fertility and pregnancy outcomes. Understanding this link is essential for guiding clinical management and improving patient prognosis.
PMOS affects approximately 5-10% of women of reproductive age globally.1 While its aetiology is multifactorial, insulin resistance is present in 50-70% of women with PMOS, independent of obesity status.2 This metabolic dysfunction contributes to the characteristic features of PMOS, including hyperandrogenism, anovulation, and dyslipidaemia. The elevated insulin levels stimulate ovarian androgen production, disrupting follicular development and leading to chronic anovulation, a primary cause of infertility in these patients.3
Beyond fertility challenges, insulin resistance in PMOS significantly impacts pregnancy outcomes. Women with PMOS have an increased risk of gestational diabetes mellitus (GDM), pre-eclampsia, and preterm birth.4 For instance, the prevalence of GDM in PMOS patients is reported to be 2-3 times higher than in the general obstetric population.5 This increased risk is directly correlated with the degree of insulin resistance and obesity. Pre-eclampsia, another serious pregnancy complication, is also more common, with some studies reporting a relative risk of 3.5 in PMOS patients compared to controls.6
Clinical Implications for Fertility and Pregnancy Management
The management of PMOS-related infertility often involves ovulation induction agents such as clomiphene citrate or letrozole. However, in insulin-resistant PMOS patients, these agents may have reduced efficacy. Metformin, an insulin-sensitising agent, has been investigated for its role in improving ovulation rates and pregnancy outcomes in this subgroup. A meta-analysis of randomised controlled trials showed that metformin, when used alone or in combination with clomiphene, improved ovulation rates (Odds Ratio [OR] 2.68; 95% CI 1.99-3.60) and live birth rates (OR 1.86; 95% CI 1.30-2.66) in women with PMOS.7
During pregnancy, the presence of insulin resistance in PMOS patients necessitates close monitoring for metabolic complications. Early screening for GDM, often earlier than the standard 24-28 weeks gestation, is recommended.8 Lifestyle interventions, including dietary modifications and regular physical activity, are foundational for managing insulin resistance and mitigating pregnancy risks. In some cases, metformin continuation throughout pregnancy has been explored, with evidence suggesting it may reduce the risk of GDM and pre-eclampsia, though its routine use remains a subject of ongoing research and individualised clinical decision-making.9
The long-term implications of insulin resistance in PMOS extend beyond pregnancy, increasing the risk of type 2 diabetes and cardiovascular disease later in life. Therefore, addressing insulin resistance is not only crucial for immediate reproductive health but also for the overall metabolic well-being of these patients.10
The persistent focus on hyperandrogenism and anovulation as the primary clinical targets in PMOS has, for too long, overshadowed the central role of insulin resistance. It is not merely a comorbidity; it is a fundamental driver of the reproductive and metabolic dysfunction we observe. Clinicians must shift from a symptomatic approach to one that prioritises early identification and management of insulin resistance, particularly in women contemplating pregnancy. The data on increased risks for GDM and pre-eclampsia are not trivial; they represent significant morbidity for both mother and child.
The pharmaceutical industry has a clear opportunity here. While metformin has demonstrated benefits, its off-label use for PMOS and the mixed evidence on its efficacy in all PMOS phenotypes suggest a need for more targeted therapies. Developing novel insulin sensitizers or exploring existing agents with better tolerability and specific efficacy in PMOS could significantly improve outcomes. Current guidelines, while acknowledging insulin resistance, could be more prescriptive regarding screening protocols and intervention thresholds, especially given the long-term health implications beyond fertility.
For patients, this means a more holistic understanding of their condition. Education on the role of diet and exercise in managing insulin resistance is paramount, not as a secondary measure, but as a primary therapeutic strategy. The expectation should be that managing PMOS is a lifelong endeavour, with interventions tailored to different life stages, from fertility planning to post-menopausal health. Ignoring insulin resistance is to treat only the symptoms, leaving the underlying pathology unaddressed, and ultimately, underserving our patients.
- The Pivot Insulin resistance is a primary driver of reproductive dysfunction and adverse pregnancy outcomes in women with PMOS.
- The Data Women with PMOS and insulin resistance have a significantly higher risk of gestational diabetes (GDM) and pre-eclampsia.
- The Action Early screening for insulin resistance and targeted interventions should be considered in PMOS patients planning conception or during pregnancy.
ART-2026-297
06/26
Cite This Article
Team TLSFE. Pmos: insulin resistance impacts fertility and pregnancy outcomes. The Life Science Feed. Published June 15, 2026. Updated June 15, 2026. Accessed June 15, 2026. https://thelifesciencefeed.com/endocrinology/polycystic-ovary-syndrome/insights/pmos-insulin-resistance-impacts-fertility-and-pregnancy-outcomes.
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References
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