The Gut Is the Foundation: Pathogens, Leaky Gut, H. Pylori, and Why Healing the Gut Changes Everything

Most people think of the gut as a digestive organ. It is that — but it is also the foundation of your immune system, your mood regulation, your hormone metabolism, your inflammatory response, and your neurological function. When the gut is compromised, the downstream effects reach every system in the body. And in clinical practice, a compromised gut is far more common than most providers acknowledge.

At Restorative Health and Wellness in Broken Arrow, gut health is not a side conversation. It is frequently the starting point — because in patient after patient, addressing what is happening in the gut is what finally moves the needle on symptoms that nothing else has touched.

What "gut imbalance" actually means

The term gets used loosely, but the clinical picture is specific. Gut imbalance — also called gut dysbiosis — refers to a disruption in the microbial ecosystem of the digestive tract. Your gut is home to trillions of bacteria, fungi, and other microorganisms that, in a healthy state, work in concert to digest food, produce vitamins, regulate immune responses, and protect the intestinal lining. When that ecosystem is disrupted, the consequences are not limited to digestion.

The disruption can take several forms:

• Bacterial dysbiosis — an overgrowth of harmful bacteria or a depletion of beneficial strains, often following antibiotic use, chronic stress, or a diet high in processed foods and low in fiber
• Parasitic infection — organisms such as Blastocystis hominis, Giardia lamblia, and Cryptosporidium are more prevalent than commonly assumed and frequently go undetected on standard stool panels
• H. pylori infection — Helicobacter pylori colonizes the stomach lining in an estimated 44% of the global population; in the United States, prevalence is approximately 35–40% and is significantly higher in certain demographic groups¹
• Intestinal permeability (leaky gut) — a breakdown in the tight junctions of the intestinal wall that allows partially digested food particles, bacterial toxins, and pathogens to enter the bloodstream, triggering systemic inflammation
• Fungal overgrowth — Candida and other fungal species can proliferate when bacterial diversity is low, contributing to fatigue, brain fog, sugar cravings, and recurrent infections

Symptoms that point to the gut

The most obvious gut symptoms are digestive: bloating, heartburn, burping, excess gas, abdominal cramping, diarrhea, constipation, or alternating between the two. These are the symptoms that prompt most people to think about gut health in the first place.

But the symptoms that are most often missed — and most often attributed to something else — are the systemic ones:

• Chronic inflammation — persistent low-grade inflammation that shows up as elevated CRP, joint pain, skin conditions, or a general sense of feeling unwell without a clear diagnosis
• Brain fog and cognitive difficulty — difficulty concentrating, word retrieval problems, and mental fatigue that do not improve with sleep
• Depression and anxiety — approximately 90–95% of the body's serotonin is produced in the gut; disruption of the gut-brain axis has direct effects on mood regulation²
• Unexplained weight gain — gut dysbiosis affects how calories are extracted from food, how fat is stored, and how insulin sensitivity is regulated
• Autoimmune conditions — including Hashimoto's thyroiditis, rheumatoid arthritis, lupus, psoriasis, and inflammatory bowel disease
• Fatigue that does not resolve with rest — often driven by nutrient malabsorption, chronic low-grade infection, or the metabolic burden of systemic inflammation
• Food sensitivities — particularly when they develop in adulthood, often a downstream consequence of intestinal permeability rather than a primary allergy

The gut-autoimmune connection

The relationship between gut health and autoimmune disease is one of the most significant — and most underappreciated — findings in modern medicine. Approximately 80% of the immune system resides in the gut-associated lymphoid tissue (GALT). When the intestinal barrier is compromised, the immune system is in a state of chronic activation.

Research published in Frontiers in Immunology and other peer-reviewed journals has established intestinal permeability as a contributing factor in the development and progression of multiple autoimmune conditions, including type 1 diabetes, multiple sclerosis, celiac disease, and rheumatoid arthritis.³ The mechanism involves molecular mimicry — where immune responses triggered by gut-derived antigens cross-react with the body's own tissues — as well as the direct inflammatory signaling that follows barrier breakdown.

Autoimmune disease affects an estimated 23.5 million Americans, according to the National Institutes of Health, with some estimates placing the figure significantly higher when subclinical autoimmunity is included.⁴ The prevalence has been rising for decades — a trend that parallels the documented decline in gut microbiome diversity in industrialized populations.

Gut health, the brain, and mental health

The gut-brain axis is a bidirectional communication network connecting the enteric nervous system of the gut with the central nervous system. This is not a metaphor — it is a physical system involving the vagus nerve, immune signaling, and the production of neurotransmitters and neuroactive compounds directly in the gut.

The implications for mental health are significant. A 2019 meta-analysis published in General Psychiatry found that patients with major depressive disorder showed significantly lower gut microbiome diversity compared to healthy controls, with specific reductions in Lactobacillus and Bifidobacterium species.⁵ A large-scale population study published in Nature Microbiology in 2019 found that the genera Coprococcus and Dialister were consistently depleted in individuals with depression, even after controlling for antidepressant use.⁶

For anxiety, the evidence is similarly compelling. Animal studies have demonstrated that germ-free mice — raised without any gut microbiome — show exaggerated stress responses and anxiety-like behavior, and that colonization with specific bacterial strains can normalize these responses.⁷ Human studies have found associations between gut dysbiosis and generalized anxiety disorder, with some intervention trials showing measurable improvement in anxiety symptoms following probiotic supplementation.⁸

This does not mean gut health is the only factor in depression or anxiety. But it does mean that treating mood disorders without evaluating gut function is treating half the picture.

The autism connection

The relationship between gut health and autism spectrum disorder (ASD) is an active and growing area of research. Children with ASD have significantly higher rates of gastrointestinal symptoms than neurotypical children — estimates range from 46% to 84% depending on the study population and diagnostic criteria used.⁹

Beyond GI symptoms, multiple studies have documented distinct differences in gut microbiome composition in children with ASD compared to neurotypical controls, including alterations in Clostridium, Bacteroidetes, and Firmicutes populations.¹⁰ A 2019 study published in Cell found that transplanting gut microbiota from children with ASD into germ-free mice induced autism-like behaviors in the recipient animals — a finding that has significant implications for understanding the gut-brain relationship in ASD.¹¹

The mechanisms under investigation include gut-derived metabolites that cross the blood-brain barrier, immune dysregulation driven by intestinal permeability, and disruption of the vagal signaling pathway. This research does not suggest that gut dysbiosis causes autism — the etiology of ASD is multifactorial and complex. But it does suggest that addressing gut health may be a meaningful component of supportive care for individuals with ASD and their families.

H. pylori: the infection most people do not know they have

Helicobacter pylori deserves specific attention because it is both extremely common and extremely underdiagnosed. H. pylori is a gram-negative bacterium that colonizes the stomach lining and, over time, disrupts the mucosal barrier, impairs stomach acid production, and creates an environment that promotes chronic inflammation.

The most recognized consequences are peptic ulcers and gastric cancer — H. pylori is classified as a Group 1 carcinogen by the World Health Organization and is responsible for approximately 89% of non-cardia gastric cancers globally.¹² But the effects extend well beyond the stomach. H. pylori infection has been associated with iron deficiency anemia (through impaired iron absorption and occult blood loss), vitamin B12 deficiency, and systemic inflammatory markers.

Many people with H. pylori have no obvious symptoms — or have symptoms they have attributed to something else for years: chronic heartburn, frequent burping, a feeling of fullness after small meals, nausea, or upper abdominal discomfort. Standard care often addresses the symptoms with acid-suppressing medication without testing for the underlying infection.

At Restorative Health and Wellness, H. pylori testing is part of our standard GI evaluation for patients with relevant symptoms or risk factors. Eradication requires a specific antibiotic protocol, and we follow up with testing to confirm clearance — because incomplete treatment is a significant driver of antibiotic resistance and recurrence.

Our root-cause approach to gut health

The conventional approach to GI complaints is largely symptom-driven: antacids for heartburn, laxatives for constipation, antidiarrheals for loose stools. These interventions address the output without asking what is producing it. Our approach is different.

Step 1: Evaluate diet and nutritional status

Before any testing, we take a detailed dietary history. The gut microbiome is shaped primarily by what you eat — and a diet high in refined carbohydrates, low in fiber, and high in inflammatory fats creates the conditions for dysbiosis regardless of what else is going on. We also assess nutritional status, because gut dysfunction impairs absorption of the very nutrients needed to repair it: zinc, vitamin D, magnesium, B vitamins, and omega-3 fatty acids are all commonly depleted in patients with chronic gut issues.

Step 2: Comprehensive GI testing

Standard stool cultures miss most of what we are looking for. We use comprehensive functional stool analysis — typically the GI-MAP or a comparable validated panel — which uses quantitative PCR to identify:

• Bacterial pathogens and opportunistic overgrowths
• Parasites, including species frequently missed on conventional O&P testing
• H. pylori and its virulence factors (which predict ulcer and cancer risk)
• Fungal overgrowth including Candida species
• Markers of intestinal permeability (zonulin, occult blood)
• Inflammatory markers (calprotectin, lactoferrin)
• Digestive enzyme activity and fat absorption markers
• Microbiome diversity and the relative abundance of key beneficial species

Where indicated, we also assess small intestinal bacterial overgrowth (SIBO) via breath testing, and we run bloodwork that includes inflammatory markers, nutrient levels, and immune function indicators.

Step 3: Remove pathogens

Once we know what we are dealing with, we address it directly. For bacterial pathogens and H. pylori, this typically involves targeted antimicrobial therapy — pharmaceutical, botanical, or a combination depending on the organism, the patient's history, and prior treatment attempts. For parasitic infections, we use appropriate antiparasitic protocols. For fungal overgrowth, we use antifungal agents alongside dietary modifications that remove the substrate the organisms depend on.

This step is not optional. You cannot repair a gut that is still under active assault from a pathogen. Attempting to heal the intestinal lining while H. pylori or a parasite is actively disrupting it is like trying to patch a tire while the nail is still in it.

Step 4: Repair the gut lining

After pathogens are cleared, we focus on restoring the integrity of the intestinal barrier. This involves targeted nutritional support — L-glutamine, zinc carnosine, deglycyrrhizinated licorice (DGL), collagen peptides, and other compounds with documented roles in tight junction repair and mucosal healing. We also address the underlying conditions that contributed to barrier breakdown in the first place: chronic stress, sleep disruption, ongoing dietary triggers, and any medications that impair mucosal integrity.

Step 5: Restore function and diversity

The final phase focuses on rebuilding a healthy, diverse microbiome. This involves strategic probiotic supplementation — not a generic off-the-shelf product, but strains selected based on what the testing showed was depleted or disrupted. It also involves prebiotic support through dietary fiber and, where appropriate, targeted prebiotic supplements. We retest at appropriate intervals to confirm that the microbiome is recovering and that pathogens have not recurred.

What happens after the gut heals

This is the part that surprises patients most — because the improvements they experience often go far beyond what they expected from a "gut protocol."

Hormones may rebalance. When the estrobolome is functioning properly, estrogen metabolism normalizes. Patients who were struggling with estrogen dominance symptoms — heavy periods, bloating, mood swings — often see significant improvement. Women on BHRT who were not responding as expected frequently begin to respond once gut function is restored. The hormones were always there; the gut was not processing them correctly.

Joint pain often decreases. Systemic inflammation driven by intestinal permeability and chronic low-grade infection is a significant contributor to joint pain that does not have a clear orthopedic explanation. As the gut heals and inflammatory markers come down, many patients report meaningful reductions in joint pain, stiffness, and the general achiness that they had accepted as a normal part of aging.

Brain fog lifts. The gut-brain axis runs in both directions. When gut-derived inflammatory signals and bacterial metabolites are no longer crossing into systemic circulation, the neurological burden decreases. Patients describe this as a clearing — thoughts come more easily, concentration improves, and the mental fatigue that had become their baseline begins to resolve.

Depression and anxiety improve. As serotonin precursor production recovers, as the vagal tone normalizes, and as the systemic inflammatory burden decreases, mood often stabilizes in ways that patients had not achieved through other interventions. This is not a replacement for psychiatric care when that is indicated — but it is a meaningful and frequently overlooked component of mental health that deserves clinical attention.

Weight loss becomes possible. Gut dysbiosis impairs metabolic function in multiple ways: through altered energy extraction from food, through effects on insulin sensitivity, through the inflammatory signaling that promotes fat storage, and through disruption of the hormones that regulate appetite and satiety. When these mechanisms are corrected, patients who had been unable to lose weight despite appropriate effort often find that their metabolism begins to respond.

Where to start

If you recognize yourself in this — if you have been dealing with digestive symptoms, unexplained fatigue, mood changes, joint pain, or a general sense that something is off and no one has been able to tell you why — a comprehensive gut evaluation is a reasonable starting point.

At Restorative Health and Wellness, we begin with a Foundation Consult: a thorough review of your history, your symptoms, and your prior labs, followed by a targeted testing plan that looks at the systems most likely to be driving what you are experiencing. For many patients, that plan includes comprehensive GI testing.

The gut is not a niche concern. It is the foundation. And in our experience, it is one of the most consistently underaddressed drivers of chronic symptoms in otherwise healthy adults.

If you are ready to find out what is actually going on, book a Foundation Consult — in clinic in Broken Arrow or via telehealth anywhere in Oklahoma.

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References

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2. Yano JM, et al. Indigenous bacteria from the gut microbiota regulate host serotonin biosynthesis. Cell. 2015;161(2):264–276.
3. Mu Q, Kirby J, Reilly CM, Luo XM. Leaky Gut As a Danger Signal for Autoimmune Diseases. Frontiers in Immunology. 2017;8:598.
4. National Institute of Allergy and Infectious Diseases. Autoimmune Diseases. NIH. Accessed 2026.
5. Simpson CA, et al. The gut microbiota in anxiety and depression — a systematic review. Clinical Psychology Review. 2021;83:101943.
6. Valles-Colomer M, et al. The neuroactive potential of the human gut microbiota in quality of life and depression. Nature Microbiology. 2019;4:623–632.
7. Cryan JF, Dinan TG. Mind-altering microorganisms: the impact of the gut microbiota on brain and behaviour. Nature Reviews Neuroscience. 2012;13(10):701–712.
8. Liu RT, et al. Prebiotics and probiotics on depressive symptoms and cognitive performance in adults: a systematic review and meta-analysis. Translational Psychiatry. 2019;9:20.
9. McElhanon BO, et al. Gastrointestinal symptoms in autism spectrum disorder: a meta-analysis. Pediatrics. 2014;133(5):872–883.
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11. Sharon G, et al. Human gut microbiota from autism spectrum disorder promote behavioral symptoms in mice. Cell. 2019;177(6):1600–1618.
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