The Menopause-Gut Connection: New Research Links Hormone Decline to a Leakier Barrier

In recent years, the gut has taken centre stage in conversations about health and wellbeing. Scientists and nutritionists are increasingly recognising just how important our gut health is, encouraging us to nourish it with a diverse, fibre-rich diet, plenty of vegetables and whole foods, and beneficial bacteria such as probiotics.

But what exactly is a healthy gut, and how does gut health change during the menopausal transition?

It’s often easy to recognise when your gut is happy and functioning well. Minimal bloating or reflux, no persistent abdominal discomfort, and regular, comfortable bowel movements are all signs that your digestive system is working as it should.

But digestive problems are incredibly common too. A heavy takeaway, a diet high in ultra-processed foods, or simply not getting enough fibre can all disrupt the delicate balance of the gut.

During periods of digestive distress, the gut barrier may also become more permeable, a phenomenon often described as “leaky gut.” The gut barrier is made up of closely connected intestinal cells, held together by structures known as tight junctions. When these junctions are compromised, the permeability of the intestinal lining can increase.

This can allow substances that would normally remain within the gut, including microbial components, to cross the intestinal barrier and interact with the immune system. This may trigger immune activation and inflammation. Interestingly, ovarian hormones also appear to play an important role in maintaining the integrity of the gut barrier. Studies in mouse models have shown that when sex hormone levels are depleted, the gut barrier becomes more permeable, suggesting that the hormonal changes associated with menopause may have implications for gut health.

A recent study published in the Journal of Clinical Investigation provides some fascinating insight into how the gut barrier may change during the menopausal transition. Researchers analysed plasma samples from 964 women participating in the Study of Women’s Health Across the Nation (SWAN), with measurements taken at multiple time points spanning premenopause, perimenopause and postmenopause.

The researchers tracked changes in two serum proteins- FABP2 (fatty acid-binding protein 2) and sCD14 (soluble CD14) over the course of the study. Both are useful markers when investigating changes in gut barrier function and the body's response to microbial products.

FABP2 is produced by intestinal epithelial cells (enterocytes) and can be released into the circulation when the intestinal lining is damaged, making it a potential marker of impaired gut barrier integrity. sCD14, meanwhile, is associated with the immune system’s response to lipopolysaccharide (LPS), a component of the outer membrane of certain bacteria. When LPS crosses the intestinal barrier, it can activate immune pathways, and circulating sCD14 can therefore provide an indication of this microbial–immune interaction.

The researchers were particularly interested in an important question: were changes in these markers simply a consequence of getting older, or did the menopausal transition itself contribute to changes in gut barrier function? To explore this, they examined protein trajectories in relation to the final menstrual period (FMP), covering approximately 8.9 years before and 16.3 years after the FMP.

The findings were striking. Both FABP2 and sCD14 increased across the menopausal transition, suggesting an association between declining ovarian hormone levels and changes in gut barrier function and microbial–immune signalling. Importantly, levels began to rise around 2-2.5 years before the FMP, during perimenopause, and continued to increase steadily, reaching a peak approximately six years after the FMP.

Interestingly, this trajectory mirrors changes observed in other physiological systems during menopause, including bone mineral density and body composition. Together, these findings raise an intriguing possibility: the menopausal transition may influence the gut in ways that extend beyond digestion, potentially linking hormonal changes with the gut barrier, immune system and wider metabolic health.

Future research should focus on identifying women at greater risk of gut-related and systemic changes during the menopausal transition, while developing targeted therapeutic strategies to alleviate symptoms and support long-term health.

Reference

A. Shieh, M. Epeldegui, A. S. Karlamangla, R. Jones, R. Pacifici and G. A. Greendale. Markers of compromised gut epithelial barrier integrity increase during the menopause transition. The Journal of Clinical Investigation, 2026.

Brandilyn A. Peters. Menopause and “leaky gut”: implications for midlife women’s health. The Journal of Clinical Investigation.