Here's something that might surprise you: the trillions of bacteria living in your gut aren't just involved in digestion. They're also actively involved in regulating your oestrogen levels.
This is an area of emerging science, and I want to be upfront about that from the start. But the mechanistic evidence is genuinely fascinating, and I think it's worth understanding even at this early stage, because it may explain something that puzzles a lot of women: why menopause symptoms vary so dramatically from person to person.
What is the estrobolome?
Your gut is home to trillions of bacteria, and it turns out some of them have a surprisingly important job: helping to regulate how much oestrogen is circulating in your body.
Here's the simple version. Your liver processes used oestrogen and packages it up ready to be eliminated from the body. But certain gut bacteria can intercept that packaged oestrogen and essentially unwrap it — releasing it back into the bloodstream in its active form. Your estrobolome is the name for the part of your gut microbiome responsible for this process.
In other words, your gut bacteria aren't just involved in digestion. They're also quietly influencing your hormone levels.
Why this matters in menopause
When your gut microbiome is diverse and healthy, this process runs smoothly. But when bacterial diversity drops — which can happen with age, stress, poor diet, or antibiotic use — that oestrogen reactivation process becomes less efficient. The result may be even lower circulating oestrogen levels, on top of the decline already happening in your ovaries.
This could help explain something that puzzles many women: why two people of the same age, at the same stage of menopause, can have completely different symptom experiences. Your gut health may be part of that answer.
Where the evidence currently stands
I want to be transparent here: large-scale human clinical trials are still lacking. Most of the evidence comes from mechanistic research and smaller studies, and the picture isn't yet clear enough to make specific supplement recommendations. Anyone selling you a targeted "estrobolome probiotic" right now is getting ahead of the science.
What the evidence does support — with considerably more confidence — is the importance of gut microbial diversity generally. And the most reliable way to support that diversity is through your diet: a wide variety of plant foods, adequate dietary fibre, and regular inclusion of naturally fermented foods like yoghurt, kefir, and fermented vegetables.
It's not a dramatic intervention. But it's a defensible, evidence-aligned one — and it's also good for your metabolic health, your immune system, and your brain. Not a bad return for eating more vegetables.
Watch this space
The estrobolome is one of the most exciting areas of menopause research right now. As the clinical trials catch up with the mechanistic science, I'll keep you updated. For now, feed your gut well — it may be doing more for your hormones than you realised.
Dr Erika Hollow, Life Reno Medic — helping professional women thrive through perimenopause and beyond
Nutrition, gut health, and how your lifestyle directly influences your hormones are all topics we explore in depth in the Reclaim programme. Enrolments are now open for April — I'd love to have you join us:
Ready to take the next step in your menopause journey?
