Key Timestamps
00:00 — Why thyroid symptoms are often missed in women
04:30 — Dr. Wentz’s personal journey with IBS and Hashimoto’s
11:15 — The gut-autoimmune-thyroid connection explained
18:40 — Post-COVID rise in autoimmune conditions and chronic fatigue
24:50 — Functional medicine testing for IBS and thyroid symptoms
33:10 — Stress, cortisol, and “leaky gut”
41:20 — How intestinal permeability triggers autoimmune disease
49:45 — Food sensitivities, bloating, edema, and inflammation
58:30 — Gut-healing protocols and favorite supplements
01:06:20 — Why women are more prone to IBS and Hashimoto’s
01:14:00 — The importance of self-advocacy and listening to your body
For years, I’ve seen women come into my office exhausted, bloated, inflamed, struggling with weight gain, constipation, brain fog, anxiety, and fatigue — only to be told their thyroid labs are “normal.”
And yet, deep down, they know something is wrong.
Many of these women are in perimenopause or menopause. Some are postpartum. Others are navigating chronic stress or recovering from illness. What they often have in common is something that conventional medicine frequently overlooks: a disrupted gut-thyroid connection.
In this episode of The Girlfriend Doctor Show, I sat down with my dear friend and colleague, Izabella Wentz, to explore one of the most important and under-discussed drivers of thyroid dysfunction and autoimmune disease: gut health.
What we discussed has the potential to completely change how you think about thyroid disease, IBS, inflammation, and even hormonal symptoms.
Why So Many Women Are Told Their Thyroid Is “Normal”
One of the most frustrating experiences for women is being told their thyroid labs are normal while they continue to feel miserable.
I see this all the time.
A woman in her late forties or early fifties comes in with:
Weight gain
Hair thinning
Fatigue
Anxiety
Constipation
Brain fog
Irregular periods
Puffy ankles
Bloating
Her TSH may technically fall within range, but when we dig deeper and run a comprehensive thyroid panel, we often uncover something important:
Elevated thyroid peroxidase antibodies (TPO antibodies)
Elevated thyroglobulin antibodies
Low free T3
Suboptimal free T4
Reverse T3 imbalances
These markers can point toward Hashimoto’s thyroiditis — an autoimmune condition where the immune system attacks the thyroid gland.
And here’s the key: autoimmune thyroid disease rarely begins in the thyroid.
It often begins in the gut.
The Gut-Thyroid Connection Is Real
One of the biggest takeaways from my conversation with Izabella is that gut dysfunction can begin years before thyroid disease appears.
In fact, many women experience symptoms of IBS, bloating, diarrhea, constipation, acid reflux, or food sensitivities long before they are diagnosed with Hashimoto’s.
This is not a coincidence.
The gut is deeply connected to the immune system. Nearly 70–80% of immune activity occurs in the gastrointestinal tract. When the gut lining becomes compromised — what functional medicine calls intestinal permeability or “leaky gut” — inflammatory particles can escape into the bloodstream.
This triggers immune activation.
Over time, the immune system may begin attacking tissues that resemble these foreign invaders. In Hashimoto’s disease, the thyroid becomes the target.
That’s why women with autoimmune thyroid disease often also struggle with:
IBS
Food sensitivities
Joint pain
Skin issues
Fatigue
Anxiety
Fluid retention
Brain fog
The gut and thyroid are constantly communicating.
When one is inflamed, the other suffers.
What Is Leaky Gut?
Leaky gut occurs when the intestinal barrier becomes damaged and permeable.
Normally, the gut lining acts like a protective filter, allowing nutrients into the bloodstream while keeping harmful substances out.
But when the gut barrier is weakened, larger food particles, bacterial toxins, viruses, and inflammatory compounds can “leak” into circulation.
This activates the immune system and increases inflammation throughout the body.
I often explain it this way to patients: the gut wall becomes less selective about what it lets through.
The result can look like:
Bloating
Food sensitivities
Swelling
Fatigue
Autoimmune symptoms
Brain fog
Skin flare-ups
Joint pain
One of the most fascinating parts of our discussion was how stress hormones like cortisol directly affect gut permeability.
Chronic stress can:
Lower stomach acid
Suppress immune defenses in the gut
Alter the microbiome
Increase inflammation
Trigger dysbiosis
Worsen intestinal permeability
This is why emotional stress, trauma, burnout, and chronic overwhelm often show up physically in the body.
The nervous system and gut are intimately connected.
IBS Is Not “Just Stress”
For far too long, women with IBS symptoms have been dismissed.
Many are told:
“It’s stress.”
“It’s anxiety.”
“It’s normal.”
“Just take a laxative.”
“Your labs look fine.”
But IBS is a sign that something deeper may be happening.
As Izabella shared in our conversation, IBS symptoms can be linked to:
Parasites
H. pylori
Candida overgrowth
Small intestinal bacterial overgrowth (SIBO)
Viral infections
Food sensitivities
Mold exposure
Nervous system dysregulation
Chronic inflammation
This is why I always encourage women to investigate root causes instead of suppressing symptoms.
The body is speaking.
We need to listen.
Signs Your Gut May Be Affecting Your Thyroid
Many women don’t realize their symptoms may be connected.
Some of the biggest red flags include:
Bloating after meals
Alternating constipation and diarrhea
Puffy ankles or fluid retention
Fatigue after eating
Acid reflux
Brain fog
Anxiety
Food reactions
Joint pain
Waking up inflamed
Feeling pregnant by the end of the day
Difficulty losing weight
These are not simply signs of aging.
They are clues.
Why Food Sensitivities Matter
Food sensitivities are incredibly common in women with autoimmune thyroid disease.
The most common triggers include:
Gluten
Dairy
Soy
Processed foods
Food additives
Sugar alcohols
Industrial seed oils
One important point we discussed is that food sensitivities are not always permanent.
When we heal the gut lining, reduce inflammation, and support digestion, many women regain resilience and tolerance to foods they previously reacted to.
That’s why I often begin with a clean, anti-inflammatory nutrition plan before jumping into extensive testing.
Healing the terrain matters.
In my practice, I’ve seen profound improvements when women:
Remove inflammatory foods
Stabilize blood sugar
Increase healthy fats
Improve mineral balance
Reduce toxic burden
Support detoxification
Heal the gut lining
This is one reason why Keto-Green nutrition has been so powerful clinically.
Reducing inflammation changes everything.
The Hidden Role of Stress and Trauma
One of the most important parts of healing is addressing the nervous system.
Chronic stress changes digestion.
When the body remains stuck in fight-or-flight mode:
Stomach acid decreases
Nutrient absorption suffers
Gut motility changes
The microbiome shifts
Immune regulation weakens
Over time, this creates the perfect environment for inflammation and autoimmunity.
Many women with thyroid disease also have histories of:
Burnout
Chronic caregiving
Trauma
Adverse childhood experiences
Perfectionism
Emotional suppression
The body keeps score.
Healing requires creating safety again — physically, emotionally, hormonally, and spiritually.
Why Menopause Makes Symptoms Worse
Hormonal transitions can expose underlying imbalances.
During perimenopause and menopause, fluctuating estrogen and progesterone levels can worsen:
Constipation
Bloating
Fluid retention
Anxiety
Sleep disruption
Thyroid symptoms
This is why so many women suddenly experience worsening digestive and thyroid symptoms in midlife.
Menopause doesn’t create dysfunction out of nowhere.
It often reveals what has already been simmering beneath the surface.
That’s why I always encourage women to support:
Hormone balance
Adrenal health
Gut healing
Mineral replenishment
Blood sugar stability
Nervous system regulation
Everything is connected.
Healing Requires a Root-Cause Approach
One of the biggest mistakes I see is symptom management without investigating underlying causes.
True healing requires asking:
Why is inflammation happening?
Why is the immune system activated?
What disrupted the gut?
What is the body reacting to?
Where did resilience break down?
This may include evaluating:
Stool testing
Thyroid antibodies
Food sensitivities
Nutrient deficiencies
Mold exposure
Gut infections
Hormonal imbalances
Stress physiology
When we address the root causes, the body often begins to heal in extraordinary ways.
I’ve seen thyroid antibodies normalize.
I’ve seen women regain energy they thought was gone forever.
I’ve seen bloating disappear, moods stabilize, sleep improve, and inflammation melt away.
The body wants to heal when we create the right environment.
You Deserve More Than “Your Labs Are Normal”
If there’s one message I want you to take away from this conversation, it’s this:
Do not ignore your symptoms simply because standard labs say everything is fine.
You are the expert on your body. If you feel exhausted, inflamed, bloated, anxious, foggy, swollen, or unwell, know there is a reason.
Your body is communicating with you—listen with compassion, not frustration.
Listen to the Full Podcast Episode
This essential conversation with Izabella Wentz provides the practical tools and empowering, groundbreaking insights you need to understand and heal the gut-thyroid connection.
We deep-dive into the root causes of IBS, Hashimoto’s, autoimmunity, and hormonal symptoms, including:
Stool testing, parasites, and infections
Food sensitivities and leaky gut
Stress physiology and nervous system healing
Menopause, postpartum recovery, and thyroid health
Functional medicine strategies
If you’ve ever felt dismissed, confused, or frustrated by your symptoms, this episode is for you.
I encourage you to listen to the full episode and share it with a friend who needs this information too.
Listen on: YouTube | Spotify | Apple podcast
Healing begins with understanding the root cause.
Q&A
Q: Can you have thyroid problems even if your TSH is normal?
Yes. Many women have normal TSH levels but elevated thyroid antibodies, low free T3, or other imbalances that point toward Hashimoto’s or suboptimal thyroid function.
Q: What is the connection between IBS and Hashimoto’s?
Both conditions are strongly connected through immune dysfunction, inflammation, and intestinal permeability. Gut issues often precede autoimmune thyroid disease.
Q: What are common signs of leaky gut?
Bloating, food sensitivities, fatigue, joint pain, swelling, brain fog, skin issues, and autoimmune symptoms can all be associated with intestinal permeability.
Q: Can stress affect the gut and thyroid?
Absolutely. Chronic stress alters digestion, suppresses stomach acid, disrupts the microbiome, and increases inflammation, all of which can impact thyroid function.
Q: What foods commonly trigger inflammation in autoimmune thyroid disease?
Gluten, dairy, soy, processed foods, sugar alcohols, and inflammatory food additives are common triggers.
Q: Is healing possible?
Yes. With a root-cause approach focused on gut healing, nutrition, hormones, stress regulation, and inflammation reduction, many women experience dramatic improvements in symptoms and quality of life.
Connect With Dr. Izabella
Check out Dr. Izabella’s new book: IBS: Finding and Treating the Root Cause of Irritable Bowel Syndrome
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Disclaimers: The information provided is for educational purposes only and should not be construed as medical advice. Always consult with your healthcare professional before starting any supplement program.
