Medical research increasingly uncovers connections between female hormones, the immune system, and gut health. Recent studies indicate that women experience functional gastrointestinal issues significantly more frequently than men, particularly due to hormonal changes during menopause, which have profound effects on the microbiome.
The Immune System Works Overtime: Ovaries After Menopause
For a long time, it was believed that the ovaries ceased their activity after menopause. However, a study from Northwestern University challenges this notion. Published on June 29 in Molecular Human Reproduction, the research reveals that postmenopausal ovaries are immunologically active.
Researchers led by Dr. Aubrey Converse and Prof. Francesca E. Duncan identified an increased presence of immune cells such as T-cells and macrophages. The expression of pro-inflammatory genes was also heightened. This chronic inflammation following the reproductive phase may explain why women experience more health problems as they age compared to men. Systemic inflammation evidently affects the gut barrier and digestive stability.
Hormonal Fluctuations and Irritable Bowel Syndrome: An Overlooked Connection
Even before menopause, the close relationship between hormones and digestion becomes evident. Approximately 70% of all irritable bowel syndrome (IBS) diagnoses are among women. Particularly affected are patients with endometriosis or polycystic ovary syndrome (PCOS), with 20-30% of them also suffering from IBS.
Progesterone and estrogen directly influence gut motility. Progesterone slows down intestinal transit, while estrogen regulates pain perception in the abdomen. Unfortunately, despite their high prevalence, women have a 33% lower chance of receiving guideline-concordant treatment than men.
During perimenopause—the transition phase between ages 45 and 50—the declining estrogen levels often exacerbate symptoms. The imbalance of neurotransmitters like serotonin not only leads to digestive issues but also increases the risk of migraines.
The Evolution in the Gut: Bacteria in Competition
A study published by the University of Vienna in Nature in May highlights the dynamics of gut bacteria. Using a method called “reverse ecology,” researchers found that gut bacteria consist of evolutionarily distinct groups competing against each other.
Certain populations significantly correlate with the age of individuals as well as with chronic inflammatory bowel diseases, colorectal cancer, and type 2 diabetes. The study, led by Martin F. Polz, shows that competitive bacterial strains can spread globally within a few decades. The microbiome is a constantly shifting system, especially sensitive during hormonal transition phases.
External Factors: Diabetes, Heat, and Weight
In addition to hormones, various factors influence gut health in later life:
Diabetes: Data from the Robert Koch Institute for the period 2021 to 2024 reveals that Type 2 diabetics over 65 have a significantly higher likelihood of experiencing depressive symptoms and lower life satisfaction. Among Type 1 diabetic women, two-thirds experience unstable glucose levels after menopause.
For diabetics, appropriate daily support is crucial for stabilizing blood sugar levels. This free guide offers seven simple 3-minute exercises that can naturally improve your glucose levels without needing a gym.
Heat Stress: Increasing temperatures pose a direct risk to the gastrointestinal tract. For each day of heat exposure, the likelihood of infections rises by 4.7%. The risk of flare-ups in chronic inflammatory bowel diseases increases by 4.6%.
Weight Fluctuations: A review published in The Lancet Diabetes & Endocrinology in July reassures about the yo-yo effect. The benefits of weight reduction for cardiovascular health and metabolic values far outweigh the risks associated with moderate fluctuations.
