By: Natalie Penaloza, MD
Editor’s Note: Natalie Penaloza, MD, took the FACTS elective while studying at the University of Texas Medical Branch and is now a resident at the Conroe Family Medicine residency program. She reviewed Corrie et al.’s “Interplay of Gut Microbiota in Polycystic Ovarian Syndrome,” which examines evidence that changes in the gut microbiome are linked with inflammation, insulin resistance, elevated androgens, and ovulatory dysfunction in polyendocrine metabolic ovarian syndrome (formerly called polycystic ovary syndrome). Penaloza considered how fertility-awareness charting could help connect this research with changes observed across the menstrual cycle. To learn more about the gut microbiome and the effect of diet on the female cycle, register for Part G of our online CME course.
Introduction
This research summary reviews the article “Interplay of Gut Microbiota in Polycystic Ovarian Syndrome: Role of Gut Microbiota, Mechanistic Pathways and Potential Treatment Strategies,” which examines how changes in gut microbial composition may contribute to the hormonal, metabolic, and inflammatory features of polycystic ovarian syndrome (PCOS), now renamed polyendocrine metabolic ovarian syndrome (PMOS). The article links changes in microbial diversity with disruptions in ovarian physiology, insulin signaling, and systemic inflammation—which highlights the growing interest in comprehensive and restorative approaches to managing PMOS [1]. Living with PMOS and charting cycles through fertility awareness-based methods (FABMs) can reveal patterns, such as delayed ovulation, that standard evaluations may miss. This experience underscores the value of understanding physiologic mechanisms and exploring root-cause approaches to individualized care.
“Living with PMOS and charting cycles through fertility awareness-based methods (FABMs) can reveal patterns, such as delayed ovulation, that standard evaluations may miss.”
Methodology
This summary draws on human cohort studies, microbiome sequencing investigations, animal models, and fecal microbiota transplantation work examining microbial diversity, metabolite profiles, inflammatory markers, and androgen levels in women with and without PMOS. The studies used methods such as 16S rRNA sequencing, metagenomics, and metabolomics to characterize bacterial, fungal, and viral
communities. Clinical data—such as hormonal assays, ovulatory tracking, body composition, and inflammatory markers—were used to evaluate correlations between microbial diversity and reproductive and metabolic outcomes. The article also highlights mechanistic pathways linking microbial changes with hyperandrogenism, insulin resistance, inflammation, and ovarian dysfunction. Through these findings, the article provides a framework for understanding how gut microbiome alterations may contribute to PMOS pathophysiology and points to potential strategies for restorative interventions.
Results
Across multiple studies, women with PMOS showed reduced microbial diversity, higher levels of pro-inflammatory gram-negative bacteria, and distinct shifts in major microbial groups, such as Firmicutes, Bacteroidetes, Actinobacteria, and Proteobacteria. Certain bacterial families, including Bacteroides, Lachnospiraceae, and Ruminococcaceae, were linked with higher androgen levels, insulin resistance, and increased body mass. Fecal microbiota transplantation from women with PMOS into mice produced hyperandrogenism, cystic ovarian appearance, irregular cycles, and metabolic dysfunction, suggesting that dysbiosis may play a contributing role. Some bacterial groups, such as Lactobacillus and Bifidobacterium, appeared to support healthier inflammatory and metabolic patterns and showed potential benefits for ovulation. While the mycobiome and virome remain less explored, early findings suggest that they may also influence metabolic regulation.
“Across multiple studies, women with PMOS showed reduced microbial diversity, higher levels of pro-inflammatory gram-negative bacteria, and distinct shifts in major microbial groups.”
Discussion
The findings point to a relationship between gut microbes and hormonal regulation in PMOS. One model suggests that diet-related dysbiosis increases intestinal permeability and systemic inflammation, which then contributes to insulin resistance and hyperandrogenism. Another proposes that elevated androgens disrupt the microbiome, creating a cycle that continues to impair ovulation and metabolic balance. These frameworks align with a root-cause approach to care, which aims to identify where physiologic breakdowns occur and guide treatment toward restoring normal function rather than suppressing symptoms. Cycle tracking can reveal delayed ovulation and prompt a closer look at inflammation, metabolic health, and lifestyle factors.The relevance of this research to women’s health and family planning is significant because it supports a more complete understanding of why ovulation dysfunction occurs and reinforces the role of FABMs as both diagnostic and empowering tools.
“The findings point to a relationship between gut microbes and hormonal regulation in PMOS. One model suggests that diet-related dysbiosis increases intestinal permeability and systemic inflammation, which then contributes to insulin resistance and hyperandrogenism.”
This growing body of research has strengths, including advanced sequencing techniques, detailed metabolic profiling, and the ability to model causality through transplantation experiments. However, limitations include small sample sizes, variations in diagnostic criteria for PMOS, differences in diet across study populations, and challenges in comparing microbiome studies due to inconsistent methods. These studies also rarely incorporate cycle-tracking data, even though PMOS is fundamentally a cycle disorder, which highlights a gap in integrating reproductive biomarkers into microbiome research.
This topic raised several questions for me:
* How do lifestyle, stress, and inflammation intersect with microbiome disturbances?
* Can early interventions using diet, probiotics, or lifestyle changes restore ovulation?
It also made me wonder how routine FABM charting could be used in future research as a noninvasive and cost-effective way to correlate microbiome patterns with real-time hormonal fluctuations. More research is needed to clarify causal pathways, evaluate therapeutic microbiome strategies, and include diverse patient experiences. Future studies would benefit from incorporating fertility awareness-based biomarkers and assessing how holistic approaches to care might complement microbiome-targeted therapies.
REFERENCES
[1] Corrie L, Awasthi A, Kaur J, Vishwas S, Gulati M, Kaur IP, Gupta G, Kommineni N, Dua K, Singh SK. Interplay of Gut Microbiota in Polycystic Ovarian Syndrome: Role of Gut Microbiota, Mechanistic Pathways and Potential Treatment Strategies. Pharmaceuticals. 2023; 16(2):197. https://doi.org/10.3390/ph16020197
ABOUT THE AUTHOR
Natalia Penaloza earned her medical degree from the University of Texas Medical Branch in Galveston, Texas and is now a resident at Conroe Family Medicine program in Conroe, Texas.. She completed her undergraduate studies at the University of St. Thomas in Houston, Texas. She is deeply interested in health equity and is committed to ensuring that patients have access to clear, evidence-based information about their health. She enrolled in the FACTS elective to learn more about fertility awareness-based methods and to build a holistic foundation for supporting individuals experiencing reproductive difficulties.
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