GUT FEELINGS: The Hidden Link Between Gut Health and Hormonal Imbalance

By Our Daughters Foundation

GUT FEELINGS: The Hidden Link Between Gut Health and Hormonal Imbalance

By Our Daughters Foundation

1. The Gut Microbiome: Your Internal Ecosystem

Your gut isn’t just a tube for digesting food. It’s home to trillions of bacteria that:

• Help break down food

• Make key nutrients (like B vitamins)

• Train your immune system

• And — importantly — regulate estrogen levels

This bacterial community is called the gut microbiome, and when it’s healthy and diverse, it supports balanced hormones. But when the microbiome is out of balance — a condition called dysbiosis — problems can arise.

2. Estrobolome: The Gut’s Hormone Filte

Inside the gut, a specific group of bacteria known as the estrobolome helps process estrogen. These bacteria produce enzymes (like beta-glucuronidase) that influence how much estrogen is reabsorbed into the bloodstream versus excreted.

When the estrobolome is overactive or underactive, it can lead to:

• Excess circulating estrogen → linked to endometriosis, fibroids, PMS, and breast tendernes

• Too little estrogen → contributing to mood changes, bone loss, and vaginal dryness

So a disrupted gut can directly amplify hormonal imbalances.

3. Inflammation: The Common Denominator

Both gut dysbiosis and endometriosis are associated with chronic inflammation. When the gut barrier is weakened (a condition sometimes called “leaky gut”), it allows inflammatory molecules to pass into the bloodstream. This triggers an immune response — and in people with endometriosis or PCOS, it can worsen pelvic pain, fatigue, and hormonal chaos.

4. What the Research Says

While this field is still developing, early studies have found:

• Women with endometriosis often have altered gut microbiomes compared to those without the condition. [Study: Ata et al., 2019, Scientific Reports]

• A high-fiber, plant-rich diet may help support a more balanced gut flora and improve estrogen metabolism. [Study: Fuhrman et al., 2004, Journal of Nutrition]

• Some researchers are exploring probiotic therapy as a future tool for managing hormone-related conditions.

5. What Can You Do?

You can’t fully control your hormones — but you can support your gut.

Here are some gut-friendly, hormone-supporting habits:

• Eat more fiber: vegetables, fruits, legumes, and seeds

• Avoid excessive sugar and processed foods

• Include fermented foods: yogurt, kefir, sauerkraut, kimchi

• Consider a probiotic — talk to your provider first

• Manage stress — cortisol (the stress hormone) also affects gut balance

• Support liver detoxification (which works with your gut to clear estrogen): eat cruciferous vegetables like broccoli and cauliflower

Final Thoughts

The gut isn’t just about digestion — it’s a key player in how your body handles hormones, pain, and inflammation.

If you’re struggling with endometriosis, PCOS, or unexplained hormone symptoms, supporting your gut might be an empowering place to start.

Want to Learn More?

Here are some helpful articles and research:

The Gut Microbiome and Estrogen Metabolism – NIH

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6471213/

Gut Microbiota and Endometriosis – Scientific Reports

https://www.nature.com/articles/s41598-019-39645-2

How the Gut Influences Hormones – Integrative Medicine Journal

https://www.imjournal.com/

1. The Gut Microbiome: Your Internal Ecosystem

Your gut isn’t just a tube for digesting food. It’s home to trillions of bacteria that:

• Help break down food

• Make key nutrients (like B vitamins)

• Train your immune system

• And — importantly — regulate estrogen levels

This bacterial community is called the gut microbiome, and when it’s healthy and diverse, it supports balanced hormones. But when the microbiome is out of balance — a condition called dysbiosis — problems can arise.

2. Estrobolome: The Gut’s Hormone Filte

Inside the gut, a specific group of bacteria known as the estrobolome helps process estrogen. These bacteria produce enzymes (like beta-glucuronidase) that influence how much estrogen is reabsorbed into the bloodstream versus excreted.

When the estrobolome is overactive or underactive, it can lead to:

• Excess circulating estrogen → linked to endometriosis, fibroids, PMS, and breast tendernes

• Too little estrogen → contributing to mood changes, bone loss, and vaginal dryness

So a disrupted gut can directly amplify hormonal imbalances.

3. Inflammation: The Common Denominator

Both gut dysbiosis and endometriosis are associated with chronic inflammation. When the gut barrier is weakened (a condition sometimes called “leaky gut”), it allows inflammatory molecules to pass into the bloodstream. This triggers an immune response — and in people with endometriosis or PCOS, it can worsen pelvic pain, fatigue, and hormonal chaos.

4. What the Research Says

While this field is still developing, early studies have found:

• Women with endometriosis often have altered gut microbiomes compared to those without the condition. [Study: Ata et al., 2019, Scientific Reports]

• A high-fiber, plant-rich diet may help support a more balanced gut flora and improve estrogen metabolism. [Study: Fuhrman et al., 2004, Journal of Nutrition]

• Some researchers are exploring probiotic therapy as a future tool for managing hormone-related conditions.

5. What Can You Do?

You can’t fully control your hormones — but you can support your gut.

Here are some gut-friendly, hormone-supporting habits:

• Eat more fiber: vegetables, fruits, legumes, and seeds

• Avoid excessive sugar and processed foods

• Include fermented foods: yogurt, kefir, sauerkraut, kimchi

• Consider a probiotic — talk to your provider first

• Manage stress — cortisol (the stress hormone) also affects gut balance

• Support liver detoxification (which works with your gut to clear estrogen): eat cruciferous vegetables like broccoli and cauliflower

Final Thoughts

The gut isn’t just about digestion — it’s a key player in how your body handles hormones, pain, and inflammation.

If you’re struggling with endometriosis, PCOS, or unexplained hormone symptoms, supporting your gut might be an empowering place to start.

Want to Learn More?

Here are some helpful articles and research:

The Gut Microbiome and Estrogen Metabolism – NIH

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6471213/

Gut Microbiota and Endometriosis – Scientific Reports

https://www.nature.com/articles/s41598-019-39645-2

How the Gut Influences Hormones – Integrative Medicine Journal

https://www.imjournal.com/

Join Us: Make a Difference Today

Your support can transform lives. Every donation helps us fund research, advocate for better care, and provide essential grants to women facing debilitating conditions.

Join Us: Make a Difference Today

Your support can transform lives. Every donation helps us fund research, advocate for better care, and provide essential grants to women facing debilitating conditions.

© Our Daughters Foundation - All Rights Reserved

Endometriosis A Trillion Dollar Blind Spot

Endometriosis: The Overlooked Frontier in Women’s Health Innovation

September 21, 20253 min read

Endo: Trillion Dollar Blindspot

Sharing a post originally written by Dr. Luka Nićin (VC at Pace Ventures | PhD in Molecular Medicine | MBA in Biotech Strategy). Whether your motivation is compassion, easing the pain of someone you love, or even pure capitalism—we see you, and we applaud the work you’re doing to raise awareness and push for answers. Let’s keep making noise together. -Kara

"1 in 10 women. 7–10 years to diagnosis. $100B+ annual economic burden.

That’s endometriosis.

And yet it’s historically received less than 0.1% of NIH funding compared to cancer or cardiovascular disease.

Women’s pain hasn’t just been ignored — it’s been systematically underinvested in.

The opportunity?

1. Therapeutics beyond blunt hormonal tools.

2. Diagnostics that cut a decade-long delay to months.

3. Digital biomarkers that finally personalize care.

4. Fertility crossover where payers and employers are already spending.

The women’s health market isn’t niche. It’s half the population.

Endometriosis isn’t only an unmet need. It’s a generational venture opportunity hiding in plain sight.

Let’s get real.

For decades, women’s pain has been treated as background noise.

Dismissed. Normalized. Ignored.

Endometriosis is the perfect case study. It affects 1 in 10 women of reproductive age. Diagnosis takes an average of 7–10 years. Current treatments are outdated, invasive, or woefully inadequate. And yet: endometriosis research has historically received less than 0.1% of NIH funding compared to cancer or cardiovascular disease.

This isn’t just a moral failure. It’s a market failure.

Why It’s Underfunded

  • Bias baked into science. Women were excluded from most clinical trials until the 1990s. We’re still living with the hangover.

  • Symptoms dismissed. Pain, fatigue, infertility? Too often chalked up as “psychological” or “part of being a woman.” That stigma slowed research, trials, and drug approvals.

  • Fragmented patient voice. Endo patients don’t die quickly, they suffer chronically. Chronic suffering doesn’t mobilize lobbying dollars like mortality does.

The result: a $100B+ annual economic burden (missed work, failed fertility treatments, repeat surgeries) with barely a handful of commercial therapies in market.

Where the Opportunity Lies

  • Novel therapeutics. Hormone modulators and non-hormonal targets are only scratching the surface. There’s room for precision medicines, immune-modulating therapies, and gene-driven discovery.

  • Diagnostics. Non-invasive, early detection tools would collapse that 10-year diagnostic delay — creating the wedge for earlier intervention and better trial design.

  • Digital biomarkers + AI. Tracking pain patterns, symptom clusters, and treatment responses at population scale can finally personalize therapy.

  • Fertility crossover. Endo sits at the intersection of women’s health and reproductive medicine — a convergence where payers, employers, and governments are finally willing to spend.

Why This Is Venture-Scale

The women’s health market is not “niche.” It’s half the population.

Endometriosis alone represents a multi-hundred-billion-dollar global TAM — hidden in missed GDP, avoidable surgeries, wasted spend. As stigma collapses and capital flows (see Melinda Gates’ $100M push into women’s health research), this space will mint new category leaders.

And unlike overfunded areas where 20 startups chase the same GLP-1 or the same AI scribes, here the greenfield is wide open. The first company to deliver real, scalable relief for women’s chronic pain will not just be a unicorn — it will be a generational company.

The Bottom Line

Endometriosis is not just an unmet need. It’s among the largest overlooked commercial opportunity in healthcare.

The science is catching up. The stigma is breaking. The capital is starting to flow.

For founders: this is your moment to define the wedge. For VCs: this is your chance to be early, not late.

Women’s pain is no longer invisible. The only question is: who’s going to build the next giant by finally taking it seriously?"

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