The Menopause Gut: Why Your Microbiome is the Missing Piece of Midlife Health with Cynthia Thurlow
We often hear that perimenopause and menopause are all about the "big three": estrogen, progesterone, and testosterone. But what if the secret to conquering stubborn weight gain, brain fog, and relentless fatigue isn't just in your hormone replacement therapy, but in your gut?
This week, I'm welcoming back nurse practitioner and world-renowned women’s health expert Cynthia Thurlow to discuss her groundbreaking new book, The Menopause Gut. Cynthia shares the harrowing personal health crisis that forced her to look past "bikini medicine" and uncover the startling connection between declining hormones and a "leaky" immune system.
If you feel like your body has stopped responding to the habits that used to work, this conversation is the "aha moment" you’ve been waiting for.
In This Episode, We Discuss:
The startling reason why Cynthia’s husband slept soundly while she faced a life-threatening health scare - and what it reveals about the female immune system in midlife.
Why estrogen is actually a potent "immune modulator" and how its decline triggers everything from aches and pains to "leaky brain."
How your gut is literally talking to your brain (and why that conversation turns into anxiety and brain fog during menopause).
Why Cynthia has evolved her stance on fasting and why "under-nourishing" is the biggest mistake middle-aged women are making today.
Which "viral" supplements are just creating expensive urine, and the non-negotiables for bone health and muscle synthesis.
Why we need to stop chasing the scale and start building the body that will keep us independent at 80.
Resources Mentioned:
The Menopause Gut by Cynthia Thurlow
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Deanna: I'm so excited to have Cynthia Thurlow back on the show. She is a Nurse Practitioner, TEDx speaker, and women’s health expert. She has a new book out called The Menopause Gut, and it is redefining how we think about midlife health.
We talk so much about hormones, perimenopause, and menopause, but Cynthia is bringing attention to something that impacts everything: our gut and immune system. If you’re dealing with bloating, fatigue, brain fog, stubborn weight gain, or feeling like your body just isn’t responding the way it used to, this conversation is going to connect the dots. Cynthia, thank you for joining me again.
Cynthia: I’ve been looking forward to this. As I often say, menopause and perimenopause are about more than just Hormone Replacement Therapy (HRT). While HRT is very important—and something we both fervently believe in—there is more to the conversation.
Deanna: I didn't fully realize the impact of the gut until I read your book. I’ve heard of the "gut-brain connection," but I didn’t understand the depth of it. In the book, you share that a personal health crisis forced you to look deeper into your own hormones. Can you tell us what happened?
Cynthia: In 2018, my husband and I went to Morocco and Southern Spain for our 15th wedding anniversary. We ate largely the same foods, but in Morocco, I contracted the worst food poisoning of my life. I didn't appreciate at the time that the severity of my symptoms was a reflection of the changes my body was undergoing during perimenopause.
Fast forward a few months, and I spent 13 days in the hospital with a ruptured appendix and a slew of complications. It’s rare to see a ruptured appendix in someone in their late 40s; it’s much more common in younger patients. My medical team’s hypothesis was that picking up a parasite like Giardia in Morocco created a "perfect storm" in my digestive system.
When I reflect back, it makes so much sense. Because of how our immune system changes and the presence of "leaky gut," I had endotoxins leaking into my bloodstream. Meanwhile, my husband—who ate the same things—had no symptoms at all.
Deanna: That sounds familiar! Our husbands seem to sleep through everything while we’re going through it.
Cynthia: Exactly. But it speaks to the fact that as we lose hormones, our immune system becomes more reactive. We are more likely to have leaky gut and an exaggerated immune response. This wasn't something I was taught in my training as a Nurse Practitioner. There just wasn't much education about the aging process in women. It was as if women "dropped off a cliff" at menopause, and I didn't think I needed to worry about it until I was actually there.
Deanna: It feels like an "aha" moment for so many women. We understand that estrogen drops, but we don’t always connect that to our brain or our gut health. Can you explain that relationship in simple terms?
Cynthia: Estrogen, progesterone, and testosterone have systemic effects—it’s not just "bikini medicine" focused on fertility. Estrogen is a potent immune modulator. When it declines, we see more leaky gut, more inflammation, and changes in serotonin and melatonin, which impacts sleep.
It also impacts gut motility. Many women in perimenopause feel like food just "sits" in their stomach longer. That is a byproduct of changes in muscle contractility related to progesterone and estrogen.
Regarding the brain, there is a communication pathway called the vagus nerve. When you’re stressed and get "butterflies" in your stomach, that’s your brain telling your gut it's anxious. Estrogen is also essential for neuroplasticity—it’s how we think and make connections. This is why women experience brain fog. If you have inflammation in the gut, that can lead to "leaky brain."
Deanna: Explain "leaky gut" for us. I hear that term often, but I’m not sure everyone truly understands what it is.
Cynthia: Our small intestine has a lining that is only one cell layer thick. "Leaky gut," or small intestinal hyperpermeability, occurs when the "gates" of those cells open up. This allows food particles to leak into your bloodstream, provoking an immune response. This is common in people with autoimmune conditions like Celiac, Hashimoto’s, or Lupus.
It can be caused by a standard American diet, chronic stress, or over-prescribed antibiotics. The good news is that leaky gut is fixable, but most people don’t realize they have it.
Deanna: What are one or two habits that make the biggest impact on gut health during menopause?
Cynthia: We have to "major in the majors." It’s fun to talk about peptides and hormones, but the basics still apply:
Prioritize Sleep: We have circadian clocks in our gut. If you eat a late meal, it shuts down melatonin production so your body can process food. You need 7–8 hours of quality sleep in a cold, dark room.
Manage Stress: We become much less stress-resilient in perimenopause. You have to cultivate boundaries and say no. I recommend things that stimulate the vagus nerve throughout the day, like singing, gargling, humming, breathwork, or connecting with nature.
Deanna: I want to touch on Intermittent Fasting because that’s why you were on the show originally. Has your opinion on fasting evolved?
Cynthia: It has. I still think it's a good strategy, but I see many women who are "over-fasting" and under-nourishing their bodies. Most of my patients are only eating 60–70 grams of protein a day, which isn't enough to build or maintain muscle.
I now use a term called "digestive rest," which is a 12-hour window that allows for 2–3 solid meals and at least 100 grams of protein. We have to be diligent about muscle loss (sarcopenia). I prefer to use fasting less frequently now, especially for women under significant stress. If you’re going through a divorce or a major move, you need to do less, not more.
Deanna: That is so true. We were raised to think "thin is in," but we need to think about our 80-year-old selves. We want to be independent and mobile, not in a wheelchair.
Cynthia: Exactly. The bodies we build now determine our independence later.
Deanna: Let’s talk about supplements. What is actually worth it and what is over-hyped?
Cynthia: I like supplements that address multiple things at once.
The Essentials: Vitamin D and Magnesium (specifically not Magnesium Oxide, which is poorly absorbed).
The Powerhouses: Creatine Monohydrate is great for sleep, brain health, and muscle strength. Adaptogenic herbs like Ashwagandha or Rhodiola can help buffer cortisol.
Over-hyped: I think Colostrum is currently over-hyped; there are other ways to support the gut. I’d also put Branched-Chain Amino Acids (BCAAs) in that category—you really need the essential amino acids instead. Also, I’d rather you get your calcium from food-based sources than supplements.
Deanna: That is so helpful. We have to get the basics right—sleep and protein—before we start adding a mountain of supplements on top. Thank you, Cynthia, for connecting these dots for us today!
