A Revolutionary New Way To Treat Menopause Symptoms – Targeting The Microbiome

Why does menopause hit some women like a freight train, while others glide through it with barely a hot flash? For decades, medicine has looked almost exclusively at the ovaries for answers. But in a recent podcast conversation with Dr. David Meriwether, a colleague at the Goodman Luskin Microbiome Center at UCLA, we explored a fascinating paradigm shift: the answer may not lie in what the ovaries are losing, but in what the gut is recycling.

We often think of estrogen production as a simplistic one-way street—produced by the ovaries, supporting the female reproductive system, and eliminated by the liver and the gut. However, new research illuminates a complex biological feedback loop known as the “estrobolome”—a specialized collection of gut bacteria capable of modulating the body’s hormonal balance long after ovarian production has declined.

The Estrobolome: The Body’s Recycling Plant

To appreciate this new research approach, we first have to understand the lifecycle of estrogen. Once estrogen has done its job in the body and brain, the liver packages it for disposal. It does this by attaching a sugar molecule, a chemical “tag” that inactivates the hormone and marks it water soluble for excretion in bile, and eventually, stool.

If the gut were a sterile environment, that would be the end of the story. The estrogen would simply leave the body and before menopause sets in, the ovaries produce enough new estrogen to keep the hormone levels in the blood more or less constant. But the human gut is not sterile. It is a thriving ecosystem of trillions of gut microbes.

Certain bacteria in the gut possess two groups of enzymes—known under the scientific name beta-glucuronidase and arylsulfatase—that can cut that chemical tag off, thereby reactivating the estrogen. Rather than being excreted in the stool, once reactivated, it can be reabsorbed through the intestinal wall and re-enter the bloodstream increasing the estrogen levels in the body.

In essence, your gut microbiome acts as a recycling plant. If you have a microbiome rich in these specific “recycling” bacteria, you may be able to hold onto more systemic estrogen, potentially buffering the steep hormonal drop-off occurring during menopause which is the cause for a range of common symptoms like hot flashes, night sweats mood swings and brain fog. Conversely, if your microbiome lacks these microbes, you might excrete estrogen more rapidly, potentially exacerbating symptoms.

And here is the most exciting aspect of this new concept: While the reduction of estrogen production by the ovaries in midlife is biologically programmed and unavoidable, the gut microbiome with its community of estrogen recycling bacteria is highly adaptable and is rapidly influenced by several lifestyle factors, in particular by what we eat.

Measuring the Unmeasured

While the concept of the estrobolome has existed in theory, proving it in humans has been notoriously difficult. This is where Dr. Meriwether’s lab is breaking new ground.

By profiling both plasma and stool samples, his team found a critical correlation: the levels of estrogen in the blood were directly linked to the activity of these bacterial enzymes in the gut. They discovered that the genetic capacity of the microbiome to recycle estrogen (the number of enzyme genes present) predicted how much active estrogen was circulating in the blood. This suggests that the gut is not just a passive bystander in menopause, but an active regulator of hormonal health.

Implications for Women’s Health

The implications of this research for half of the human population are profound. If the gut microbiome is a key dial that controls estrogen levels, it opens the door to non-hormonal microbiome targeted therapies for menopause. Instead of—or in addition to—Hormone Replacement Therapy (HRT), which carries its own set of risks and controversies, we might one day be able to prescribe “precision probiotics” or specific dietary interventions designed to cultivate a microbiome that optimizes estrogen recycling.

This systems view of menopause—involving the gut, the liver, and microbial metabolism—shifts the narrative from simple deficiency to complex management. It empowers us to look at diet and gut health as first-line tools for navigating midlife hormonal transitions. Before precision probiotics become available that specifically increase the capacity of the estrobolome, adhering to a microbiome-friendly diet with a large variety of plant-based dishes and naturally fermented foods is probably the most prudent strategy.

A Call for Independent Research

This field is in its infancy, and the potential for discovery is massive. However, funding for such cutting-edge, high-risk/high-reward research is often scarce in the traditional grant system, which tends to favor established dogma over paradigm-shifting exploration.

Dr. Meriwether’s laboratory at UCLA is currently seeking independent support to expand this critical work. His goal is to move from observation to intervention—identifying exactly which bacterial strains can be cultivated to help women manage menopausal symptoms naturally.

To learn more about the specific projects underway, I encourage you to visit The Meriwether Lab. Philanthropic contributions are the fuel that accelerates this kind of translational science. You can make a secure, tax-deductible donation specifically to his research efforts at the link below:

Support Dr. Meriwether’s Microbiome Research

Understanding the estrobolome is just the beginning. With your help, we can decipher the full conversation between our microbes and our hormones, unlocking new pathways to health and vitality at every stage of life.

For more insights into this topic, listen to the full episode with Dr. David Meriwether on The Mind-Gut Conversation Podcast below.

How The Gut Microbiome Influences Estrogen After Menopause with David Meriwether, PhD