When we talk about menopause, we usually talk about ovaries. Changing cycles, falling estrogen, hot flashes, sleep, bone, mood, and the sometimes startling feeling that a body you have known for decades has begun speaking a new language.
But in my conversation with microbiologist Dr. Eddie Romo on Menopause Mastery, I wanted to widen the frame. I think of menopause as an ovarian event, yes, but equally a microbial one. If your gut ecosystem cannot properly metabolize estrogen, whether it is the hormone you make or the hormone you take, your brain and body can pay the price for it. The real story is not hormones or microbes. It is a living system in which the two are in constant cross-talk.
You may not know this but Dr. Murray is one of the world’s experts in the estrobolome. I studied the estrobolome and hormone metabolism in her 3.5-year Ph.D. research, published in 2024. That is the question behind the estrobolome, the collection of microbial genes that participate in estrogen metabolism. It lands because so many women notice real digestive change in this season, bloating, constipation, altered bowel habits, shifting weight, or a probiotic that suddenly does nothing. When the standard answers feel thin, it makes sense to ask whether the gut is part of the picture.
It often is. Menopause does not start in the gut in the sense of being caused by bacteria, the driver is declining ovarian function, but the gut is a genuine participant in how your estrogens are recycled, how the intestinal environment responds to hormonal change, and how each woman experiences the transition. The science is real and growing, and women deserve a more interesting answer than “it is just aging” on one side or “your stool test explains everything” on the other.
Medical note: This article is educational and is not a diagnosis or treatment plan. New, persistent, or severe digestive symptoms, or troublesome menopause symptoms, deserve individualized medical care. Do not change prescribed medication or hormone therapy based on a consumer stool or urine test.
The gut-hormone conversation is bigger than a bacteria list
The microbiome is not a static collection of “good” and “bad” bugs. It is an ecosystem shaped by your food, medications, sleep, movement, stress, illness, age, pets, where you live, and even the folds and lining of your own intestine, which actually feed specific strains. Dr. Romo describes it as a system, not a scavenger hunt for one villain microbe, and that reframing matters, because it is also why a probiotic that colonizes beautifully in one person does nothing in another.
Hormones fit that systems view. A hormone is a signaling molecule responding to the whole network, the intestine, liver, immune system, metabolism, brain, vagus nerve, and microbial community all have a hand in it. In the episode, we zeroed in on the estrobolome. Your liver packages some estrogens for elimination. Certain gut microbes make enzymes, including beta-glucuronidase, that cleave off that tag and allow some estrogen to be reabsorbed through the gut instead of leaving in stool, one route of enterohepatic estrogen circulation.[1]
That is real biology, not a verdict on your health. Beta-glucuronidase is not automatically a “bad” enzyme, and a microbe is not harmful just because it carries the gene. When we first identified it, we had a very binary view, this enzyme is bad. The deeper truth is about concentration and activity: how many microbes make it, how much, and in response to what, alongside the other organisms present, the gut lining, diet, medications, and the liver. A report that flags one red enzyme cannot tell a woman she is estrogen deficient, estrogen dominant, “toxic,” or in need of a particular supplement.
Here is a finding worth sitting with, because it is one Dr. Romo and I have both spent years on: the microbes that make this estrogen-recycling enzyme tend to increase, on average, as a woman’s own estrogen falls through menopause. We read that as an adaptive, symbiotic move, the body and its microbes both benefit from keeping some estrogen in circulation. It is an average and an emerging picture, not an iron law for every individual, and it is hard to fully separate from age, diet, body composition, and medications.[2] But it points the same direction as the biology: the gut and reproductive hormones are genuinely interlaced, and we are still learning what that means for any one woman.
Why this question lands so hard in midlife
Most women do not arrive in perimenopause with one neat symptom. They arrive with a pile that is easy to separate on paper and hard to separate in real life: disrupted sleep, anxiety, hot flashes, constipation, new food sensitivity, brain fog, a changing body, and the sense that everything that used to work no longer does.
I have long been interested in how estrogen supports the integrity of the intestinal lining, what people call leaky gut, and microbial diversity. When estrogen drops unpredictably in this transition, we do see the estrobolome shift, and anecdotally I often see changes in the friendlier microbes too, some of the bifidobacteria and lactobacillus. A drop in estrogen is one meaningful change in midlife, but it is not the only one, and inflammation is multifactorial. A woman may have IBS, constipation, medication effects, food intolerance, pelvic floor dysfunction, celiac disease, thyroid disease, or another GI condition riding alongside the transition.
So I do not want us to dismiss the gut, and I do not want us to turn the gut into a catchall. “Bloating” is not a diagnosis. Neither is “dysbiosis,” which simply means an altered microbial community, a jacked-up gut, a jungle that should have squirrels and birds and instead has too many snakes and cockroaches. And if you have rectal bleeding, black or bloody stools, unexplained weight loss, anemia, or persistent significant pain, do not let any hormone or microbiome theory delay a proper evaluation.[3]
The better question is not “is my gut broken?” It is “what has changed, what patterns am I noticing, and what deserves a closer look?”
I changed my mind about the probiotic-for-everyone approach
After more than two decades with clients and patients, I have become far more targeted with probiotics. Early in my career, I might have lumped fish oil, vitamin D, and a daily probiotic into the same blanket recommendation. The deeper I went, the clearer it became that probiotics aren’t one thing and that, as Dr. Romo puts it, the keystone groups established in your gut early in life set up their houses and don’t let newcomers move in. They let them picnic in the front yard and then send them off. In most capsule forms, the probiotic does not actually colonize, which is exactly what the research shows.
That does not make probiotics useless. Specific strains help specific people for specific reasons, and if you have a clear target, a targeted product can be genuinely useful. But the one that helped your friend, or has a gorgeous marketing page, is not automatically the fix for your hot flashes, constipation, or brain fog, and major gastroenterology guidance has found insufficient evidence to routinely recommend probiotics for several common digestive conditions, including IBS.[4]
The food-first work is less glamorous and more durable: fibrous foods, prebiotics, polyphenol-rich plants, and, for those who tolerate them, fermented foods. Beans, oats, berries, vegetables, whole grains, nuts, seeds, yogurt, kefir, kimchi, whatever fits your culture and your gut. You are feeding large swaths of your microbiome rather than chasing a perfect score. There is no prize for forcing kombucha or a high-fiber meal that leaves you miserable. If you have IBS or bloat easily, add fiber gradually, lean on what you tolerate, favor soluble fiber, and consider a short, professionally guided low-FODMAP trial before reintroducing foods.[5]
A stool test can be a snapshot, not your whole story
Dr. Romo used an image worth keeping: a stool test is a snapshot, and often a blurry one. Your gut holds pounds of microbes that fluctuate from meal to meal, day to day, and across sleep, stress, travel, activity, and medication. One sample can be an interesting data point. It cannot capture the whole ecosystem or explain why you have a symptom, which is why we’re far more excited about thoughtful, longitudinal measurement, tracking how your microbiome responds over time, than about a single pricey snapshot. An international expert consensus likewise concluded that evidence for routine clinical microbiome testing remains limited and cautioned against testing without demonstrated value.[6]
Before you spend hundreds of dollars on a test or work with a practitioner who may not have the skills to understand nuance or context, ask: What specific question will this answer for me? Are the result going to support a plan to personalize the protocol in one like me? What would actually change in my care? Is there a more established test for the symptom I have? If the only answer is an open-ended, expensive supplement protocol, pause. More data is not always more clarity.
Disclosure: Dr. Romo leads scientific efforts at PH Bio, and I shared on the episode that I have helped with PH Bio product development and research related to women’s hormonal health, including condition-specific testing still in development. This article does not evaluate or endorse any PH Bio product, and no current stool-test result should be used to diagnose menopause, choose a hormone dose, or promise an outcome.
Where I will plant a flag: test the hormones
Here is where I get loud, and it is the flip side of my caution about commercial gut tests. I am frustrated by a standard of care that says do not test a woman’s hormones, that as long as her hot flashes ease she is fine. That is nonsense we would never tolerate for any other endocrine deficiency. We will not prescribe a man testosterone without checking his blood work first, and we test him again after. But a woman asking to see her hormone levels gets treated like she is being difficult. That is a double standard.
So I am an advocate for every woman having the right to explore hormone therapy and to actually look at her data. For bothersome hot flashes and night sweats, systemic hormone therapy is the most effective option for many appropriate candidates, and the decision should reflect your symptoms, age, time since menopause, health history, uterus status, risks, goals, and response.[7] Urinary hormone metabolite testing can show free levels and how you actually metabolize estrogen, which a single blood value misses, though I will be honest that most commercial urinary panels today are inadequate because they miss the latter half of the metabolism pathway and whether you are clearing estrogens properly. Pulling the hormone, the metabolism, and the gut together is exactly the gap Dr. Romo and I are working to close.
What I am not saying is that you prescribe hormone therapy to “fix” a stool-test result, or that there is a validated estrobolome cutoff that picks your formulation or dose. There is not. And the relationship runs the other way too, in a hopeful way: because hormones and microbes are so interlaced, appropriate hormone therapy may itself help re-establish a healthier gut environment for some women, an idea we are only beginning to study. If you are on hormone therapy and still do not feel well, that is a reason for a careful reassessment of dose, delivery, metabolism, and the whole system, not a reason to assume your gut is blocking the treatment.
The gut-brain promise needs grown-up language
The gut-brain conversation is compelling, especially for women worried about memory or a family history of Alzheimer’s. Dr. Romo’s research sits right here, and his thesis is important: Alzheimer’s increasingly looks like a systemic problem, not only a disease of the brain. Inflammation and compromised barrier integrity, including leaky gut, may precede and help drive the accumulation of plaques, which is why the things happening before the plaques, and years before a diagnosis, are where the opportunity to intervene lives.
That is a genuinely hopeful reframe, and it deserves honest language. An association between the gut and the brain is not yet proof that leaky gut causes Alzheimer’s, and a microbiome test cannot predict dementia today.[8] We should also be accurate about the drugs. The early strategy of simply stripping plaques disappointed, and some approaches carried real risk. But it is not accurate to say today’s anti-amyloid medicines accelerate the disease: for selected people with early Alzheimer’s, the FDA-approved drugs lecanemab and donanemab slowed clinical decline in trials. They are not cures, and they carry serious risks, including amyloid-related imaging abnormalities that can involve brain swelling or bleeding, so specialist evaluation and monitoring matter.[9][10] The most useful version of systems biology is not a promise that one gut fix prevents every disease. It is the refusal to keep treating the brain, gut, hormones, immune system, and metabolism as if they live in separate rooms.
Questions women ask when their gut changes in menopause
Does menopause start in the gut?
Menopause is an ovarian transition, not a condition caused by gut bacteria. But the gut is a real participant: it helps recycle estrogens and responds to hormonal change, and the estrogen-recycling microbes tend to rise as your own estrogen falls. The question is most useful when it opens a conversation about systems rather than a hunt for one culprit.
What does beta-glucuronidase on a gut test mean?
It is an enzyme some microbes make that can recycle certain estrogen compounds back into circulation. A single result does not diagnose high or low estrogen, pinpoint the source of your symptoms, or set your treatment plan. Concentration, activity, and context are everything.
Can a probiotic balance my hormones?
No probiotic has been established as a treatment for menopause or a way to “balance” estrogen. A targeted product may help specific digestive issues, but strain, dose, goal, safety, duration, and your individual response all matter, and most capsules do not colonize the way the marketing implies.
Do I need stool or urine testing before starting menopause treatment?
You do not need a commercial stool or microbiome profile to begin menopause hormone therapy care, and current gut tests are snapshots with real limits. Hormone testing is a different matter, and one I favor: seeing your levels and, ideally, how you metabolize estrogen gives you and your clinician more to work with than symptoms alone, even though today’s commercial urinary panels have gaps.[7]
Ask a better question, then bring us into the conversation
Women do not need less curiosity about their bodies. We need more of it, plus research that stops treating women’s hormonal health as an afterthought, clinicians who can hold more than one system in view, and the honesty to say “this is fascinating, but it is not ready to be a promise.”
If this gave you language for something you have been feeling, share it with a friend navigating the same confusing season, and if you have a gut, hormone, or brain-health question you want us to dig into, leave a comment, because I do read them and they shape what we make next.
At Menrva, we are building care around the woman in front of us, not a generic symptom list or a single test result. You deserve to be heard, to ask better questions, and to have a plan that fits your actual life.