Part 1: The Gut–Hormone Connection: How Your Gut Bacteria and Estrogen Influence Each Other

Could your gut health be connected to your hormones? Emerging research suggests the relationship may be more important than we once realized.

When we think about perimenopause, symptoms such as hot flashes, night sweats, mood changes, disrupted sleep, and irregular periods often come to mind.

But what about our digestive health?

Many women notice changes in digestion during their 40s and 50s, sometimes around the same time that other perimenopausal symptoms begin.

Interestingly, emerging research suggests that our gut bacteria and hormones may be more closely connected than previously understood.

And the most fascinating part? This relationship appears to work in both directions.

Meet the Estrobolome: Where Gut Health Meets Hormonal Health

Most of us have heard of the gut microbiome, the trillions of microorganisms living in our digestive tract.

These microorganisms do much more than help us digest food. They interact with our immune system, contribute to metabolic processes, and influence various aspects of our health.

Within this microbial community is something researchers call the estrobolome.

The estrobolome refers to the collection of gut microbial genes involved in estrogen metabolism.

Here's how it works.

After estrogen circulates through the body, some of it is processed by the liver and prepared for elimination through the digestive tract.

Certain intestinal bacteria produce an enzyme called beta-glucuronidase, which can help release estrogen metabolites from their conjugated forms. This may allow some estrogen to be reabsorbed into circulation rather than eliminated.

This process is known as enterohepatic recycling.

In simple terms, our gut bacteria may influence how our bodies process and recycle estrogen.

Researchers are still investigating how much this process affects estrogen levels and whether it meaningfully contributes to perimenopausal symptoms.

But Here's the Interesting Twist: Estrogen May Also Influence Your Gut

For years, researchers have explored how gut bacteria influence hormones.

Now, newer research is examining the reverse relationship: how hormonal changes during perimenopause and menopause may affect the gut itself.

Estrogen interacts with tissues throughout the body, including the gastrointestinal tract. It may influence intestinal motility, immune activity, and aspects of the intestinal barrier.

A 2026 longitudinal study involving women from the Study of Women's Health Across the Nation (SWAN) found that blood markers associated with intestinal barrier changes increased around the menopausal transition.

This suggests that hormonal aging may be associated with changes in the intestinal environment.

While more research is needed to understand the clinical implications, the findings highlight an important concept:

Our hormones may influence our gut health, just as our gut bacteria may influence estrogen metabolism.

Why Does This Matter for Women?

Perimenopause involves more than changes in reproductive hormones.

Women may also experience changes in sleep, metabolism, mood, body composition, and digestive function.

Understanding the relationship between these systems may help us develop a more comprehensive approach to supporting women's health.

At Greystones Health, we believe that looking at the bigger picture is an important part of helping women navigate this stage of life.

Rather than focusing on hormones or digestion in isolation, we consider how different aspects of health may interact.

Coming Up in Part 2

Why Gut Health Matters During Perimenopause: Five Ways to Support Your Digestion and Wellbeing

We'll explore why digestive symptoms deserve attention during perimenopause and discuss practical steps you can take to support gut function and healthy aging.

Greystones Health provides personalized naturopathic care for women's hormonal health, digestive health, and healthy aging. Book a Meet & Greet to learn how we can support you.