Conditions
Leaky Gut: Symptoms, Root Causes, Testing & the 6R Healing Protocol
What increased intestinal permeability actually is, why zonulin changed everything, the six drivers behind it, how it cascades into autoimmunity, and the complete six-phase protocol I've used with thousands of patients — foods, supplements, lifestyle, testing and troubleshooting.
Leaky gut — increased intestinal permeability — means the tight junctions between the cells lining your small intestine have opened, letting bacteria, undigested food and toxins like LPS into the bloodstream, where the immune system reacts. It is a measurable mechanism, not a slogan: zonulin, the protein that opens those junctions, rises before autoimmune disease develops. Most people feel meaningful relief in 4–12 weeks on the protocol below; full healing of the lining takes 3–6 months.
- Common signs: bloating, food sensitivities that multiply, skin flares, brain fog, joint pain, fatigue sleep doesn't fix, hormone imbalance, an autoimmune diagnosis
- The six drivers: chronic stress (the most missed), the modern diet, glyphosate, gluten and modern wheat, medications and alcohol, chronic infections
- Testing: GI-MAP, zonulin, lactulose-mannitol, a micronutrient panel — standard bloodwork won't catch it
- The fix: the 6R protocol — Remove, Replace, Reinoculate, Repair, Rebalance, Reframe — over 30 days, then retest at 90
- Check protocol PDF availability below and request an email.
In my first year of practice, I was the patient I'd later spend my career treating. Working eighty-hour weeks, cortisol pinned through the roof, eating poorly because I never stopped — I developed full-blown leaky gut: bloating, brain fog, autoimmune symptoms, sensitivities to foods I'd eaten my whole life. The textbooks I'd just finished hadn't taught me what was wrong with me, and they certainly hadn't taught me how to fix it. Three years earlier my mom had been diagnosed with cancer, and the chemotherapy and antibiotics that followed had wrecked her gut. So I learned how to heal her — and in healing her, I learned how to heal myself. What follows is that protocol.
What leaky gut actually is
Your gut wall is one cell thick, held closed by microscopic gates called tight junctions. In a leaky gut, those gates fail, and what should stay inside the intestine reaches the bloodstream and the immune system.
Folded out, your gut wall covers the surface area of a tennis court, and roughly 80% of your immune system lives in it. The entire boundary between your bloodstream and the outside world is a layer one cell thick, sealed by tight junctions. In a healthy gut those gates open just enough to let nutrients pass and stay closed against everything else. When they fail, bacteria, undigested food particles and bacterial toxins called LPS spill into the blood where they don't belong. The immune system goes into permanent high alert, and inflammation spreads everywhere. 6 13
Zonulin: the discovery that changed everything
In 2000, Harvard researcher Dr. Alessio Fasano discovered the only known human protein that opens those tight junctions: zonulin. When zonulin rises, the gates open. Gluten, stress and toxins all elevate it. 14 A 2024 study in Pediatrics tracked at-risk children and found zonulin was elevated before autoimmune disease developed — meaning leaky gut isn't a consequence of disease. It comes first. 2 The lining renews itself every 5–7 days, which is why the right inputs change how you feel quickly.
The six root causes
Most cases involve three or four of these at once. Identify yours and you've found the path to healing.
- Chronic stress — the #1 driver, most missed Cortisol elevates zonulin within hours, shrinks the gut's protective mucus layer and crashes secretory IgA, your gut's antibody defense. 8
- The modern diet Refined sugar, seed oils, refined grains and ultra-processed foods feed pathogenic bacteria, drive inflammation and starve beneficial flora. 18
- Glyphosate Roundup-sprayed wheat, oats, corn and soy. Glyphosate inhibits an enzyme of beneficial gut bacteria while sparing pathogens like E. coli and Clostridium, and damages the tight-junction proteins ZO-1 and ZO-2 directly. 3 4
- Gluten and modern wheat Gliadin activates zonulin in every human — celiac or not. Modern dwarf wheat is structurally different from ancient grains. 15 16
- Medications and alcohol NSAIDs thin the gut's mucus layer in hours; antibiotics wipe out beneficial bacteria for six months or more; alcohol directly increases zonulin. 17
- Chronic infections SIBO, parasites, Candida overgrowth, H. pylori, Epstein-Barr reactivation. Test before you treat.
Most patients I see have four of the six running at the same time. The protocol addresses all six, in the right order.
How a leaky gut becomes an autoimmune disease
The same five-stage cascade plays out behind every autoimmune condition. Heal the gut early and you can break the chain before it reaches your thyroid, joints or skin. 1
Stress, gluten or glyphosate cracks the gut wall.
Bacteria, food and toxins enter the bloodstream.
Antibodies attack the invaders; chronic inflammation begins.
Body tissue resembles invaders; confusion sets in.
The immune system attacks your own tissue.
Conditions linked to leaky gut in the literature: Hashimoto's thyroiditis, type 1 diabetes, rheumatoid arthritis, lupus, multiple sclerosis, celiac disease, Crohn's and ulcerative colitis, psoriasis and eczema, anxiety and depression. 7 20
Do you have leaky gut? The 18-point self-assessment
Use the display-only self-check below, or take the Gut Health quiz for a scored assessment.
Use this list to reflect on the past three months. This self-check has no score and saves nothing.
Download the protocol PDF
Get the Healing Leaky Gut Protocol in your inbox.
Email me the Healing Leaky Gut Protocol PDF when it’s ready. Unsubscribe anytime. Use the email address for your Dr. Axe account.The 6R protocol: six steps, one healed gut
Most protocols stop at five Rs. The sixth — Reframe — is what makes healing last, because stress is the number-one driver of leaky gut and you can't fix the gut without fixing what's driving the stress.
Remove
Days 1–7The most important phase. You're taking out everything that's keeping the gut inflamed — the inputs breaking the strainer faster than your body can repair it. Most people feel measurable improvement in this week alone.
- Eliminate gluten, dairy, refined sugar, alcohol and seed oils — completely, for at least 30 days
- Switch oats, corn and soy to organic to dodge glyphosate residue
- Stop unnecessary NSAIDs and over-the-counter acid blockers, if cleared by your doctor
- Write down your three biggest stressors; you'll address them in Phase 5
- Drink half your body weight in ounces of filtered water daily, with a pinch of sea salt
- Wild salmon, sardines, grass-fed beef
- Pasture-raised eggs and chicken
- Bone broth, 8–16 oz daily
- Steamed leafy greens, zucchini, squash
- Avocado, coconut oil, olive oil; berries in moderation
- Magnesium glycinate 300–400 mg, evening
- A quality multivitamin with food
- Activated charcoal (optional) away from meals
a possible 2–4 day adjustment headache, fatigue or cravings as you withdraw from gluten and sugar; reduced bloating and clearer thinking by day 5–7 for most people; mild detox symptoms are normal — drink more water.
Replace
Days 8–14Restore what's missing on the digestive side. Years of stress, antibiotics and acid blockers leave most people with too little stomach acid, too few enzymes and sluggish bile flow. You can't repair a gut that can't break food down properly.
- Digestive enzymes with HCl at every meal that includes protein
- Bitter foods 15 minutes before meals: arugula, dandelion greens, lemon water, apple cider vinegar
- Chew each bite 20–30 times — digestion starts in the mouth
- Sip warm bone broth between meals
- Stop drinking large volumes of water with meals; it dilutes stomach acid
- Cold drinks with meals
- Eating while stressed or distracted
- Late-night eating after 8 PM
- Digestive enzymes + betaine HCl, 1–2 capsules with each meal
- Ox bile 125–500 mg with fatty meals if you have no gallbladder
- Bitter herb tincture, 15 drops before meals
less bloating after meals and more energy after eating instead of fatigue; possible mild reflux for the first 2–3 days as the HCl dose calibrates — normal.
Reinoculate
Days 8–30, alongside ReplaceRepopulate the microbiome — but most people get this wrong. Adding probiotics into a still-inflamed gut, or taking the wrong prebiotics, can make symptoms worse. Go slow, go gentle, use the right strains.
- A multi-strain probiotic (50 billion CFU+) in the morning, away from food
- Saccharomyces boulardii if you suspect SIBO or have had antibiotic damage
- Fermented foods slowly: start with 1 tablespoon a day, work up to a quarter cup
- Gentle prebiotics only — PHGG and acacia fiber; skip inulin and FOS until healed
- Work toward 30 g of fiber daily, mostly from cooked vegetables
- Sauerkraut and kimchi in small amounts; coconut yogurt, water kefir
- Cooked greens, sweet potato, butternut squash
- Berries, baked apples, organic gluten-free oats
- Raw onion and garlic in large amounts; inulin, FOS and chicory root early on
- Sugar-sweetened yogurts and probiotics with prebiotics added
possibly mild gas or bloating in the first week as the microbiome shifts; more regular, formed bowel movements; skin clearing within 2–3 weeks for many people.
Repair
Days 14–30Where the gut lining actually rebuilds. Its cells renew every 5–7 days; your job is to give them the building blocks. L-glutamine is the single most important amino acid for gut healing, and zinc carnosine is the most clinically studied compound for restoring the lining. 9 10 11
- L-glutamine powder 5 g, morning and evening, in water, away from meals
- Zinc carnosine 75 mg twice daily with food
- Collagen peptides 10–20 g daily in coffee, smoothies or soups
- Slippery elm, marshmallow root or DGL for extra lining support
- Bone broth, ideally 16 oz daily
- Collagen-rich cuts: oxtail, short ribs
- Wild salmon and sardines (vitamin A), pasture eggs (zinc, choline)
- Steamed cabbage; aloe vera juice, inner fillet only
- Excess raw vegetables; spicy food until healing settles; alcohol, which delays healing dramatically
the most measurable changes by day 21–30; food sensitivities begin to fade as the lining seals; steady energy through the day with no post-meal crash.
Rebalance
Daily, foreverThe lifestyle layer — the practices that decide whether your gut stays healed. Stress is the number-one driver, so this phase is non-negotiable. The vagus nerve runs from your gut to your brain; train it and you train your gut to stay closed. 8
- Sleep 7–9 hours in a cool, dark, screen-free room, same bedtime nightly
- Vagus nerve activation daily: slow nasal breathing, humming, gargling, cold-water face dunks
- Walk 30+ minutes daily, ideally outside in morning sunlight
- Eat calm and seated — never standing, driving or scrolling
- A 12-hour overnight fast minimum (7 PM to 7 AM)
- Continue Phase 4 healing foods; add tolerated whole grains back slowly
- Reintroduce dairy carefully — raw, A2 or fermented first
- Quality red meat 2–3× weekly; 30+ plant types a week
- Magnesium glycinate 300–400 mg evening; an adaptogen blend (ashwagandha, holy basil, rhodiola); omega-3s 2–3 g with food
by month two most patients describe feeling “normal again”, sometimes for the first time in years; stress tolerance improves; sleep deepens and dreams return.
Reframe
LifelongMost leaky gut protocols stop at five Rs, and most patients don't fully heal. You can't fix the gut without fixing the thoughts, beliefs and identity driving the stress. Four practices:
Identify what you're afraid of and replace it with truth, evidence and Scripture. Fear keeps cortisol elevated and the gut open.
Activates the vagus nerve and switches the body from fight-or-flight to rest-and-digest — the only state the gut can repair in.
Three things every morning, written down. Clinically shown to reduce cortisol.
Stop saying “I have an autoimmune disease.” Start saying “I am healing.” Language shapes physiology.
This is a lifelong practice; no fixed timeline is specified.
Foods that heal, foods that harm
Every food is information. These ten heal — gentle, nutrient-dense and clinically supported. The avoid list is shorter, but every item on it is non-negotiable until your gut is sealed.
- Bone broth Glycine, glutamine and collagen — the building blocks of new gut lining.
- Wild salmon & sardines Omega-3 EPA/DHA resolve inflammation and rebuild cell membranes.
- Pumpkin, squash & sweet potato Soft, gentle prebiotic fiber; beta-carotene supports cell renewal.
- Fermented vegetables Live Lactobacillus and yeasts; sauerkraut and kimchi crowd out pathogens.
- Coconut oil & MCT Lauric acid is naturally antimicrobial against Candida.
- Pasture-raised eggs Choline, zinc and vitamin A; the most digestible complete protein.
- Aloe vera (inner fillet) Polysaccharides soothe and coat the inflamed lining; food-grade only.
- Raw manuka honey Antimicrobial; methylglyoxal targets H. pylori and biofilms.
- Cooked leafy greens Magnesium, folate, chlorophyll; cooked is gentler than raw.
- Baked pears & berries Soluble fiber and polyphenols feed beneficial bacteria gently.
Remove for 30 days: all gluten (wheat, barley, rye, conventional oats), conventional dairy, refined sugar and artificial sweeteners, vegetable, canola, soybean and corn oils, alcohol, caffeine over one cup a day, processed and packaged foods.
The 7-day meal plan
A simple, gut-friendly week. Every meal is anti-inflammatory, easy to digest and built around the top ten healing foods. The full plan with the grocery list is on the site, and you can rebuild it with the meal planner.
| Day | Breakfast | Lunch | Dinner | Extras |
|---|---|---|---|---|
Monday | Pasture eggs in ghee, sautéed spinach | Bone broth + grass-fed beef bowl | Wild salmon, sweet potato, broccoli | Avocado + sea salt |
Tuesday | Coconut yogurt + berries + collagen | Roasted chicken thighs over greens | Beef stew with carrots & turmeric | Baked cinnamon pear |
Wednesday | Bone broth + 2 boiled eggs + kraut | Salmon salad — cucumber, lemon, dill | Lamb chops, mashed cauliflower, kale | Collagen protein shake |
Thursday | Smoothie — coconut milk, collagen, blueberry | Turkey-zucchini soup, fermented veg | Pan-seared cod, roasted carrots, ghee mash | — |
Friday | Coconut yogurt + manuka honey + seeds | Bone broth + slow-cooked short ribs | Wild salmon poke bowl, cauliflower rice | 2 squares dark chocolate |
Saturday | Eggs + smoked salmon + asparagus | Roasted vegetable + chicken thigh tray | Grass-fed burger, lettuce, sweet potato fries | Bone broth latte |
Sunday | Bone broth + 2 eggs over greens | Roast chicken, butternut soup, kraut | Slow-cooked lamb shoulder, kale | — |
Daily herbal teas: ginger and slippery elm, two cups between meals; chamomile and marshmallow in the evening to calm gut and nerves.
The supplement stack, in tiers
Start with the four Essentials. Add Recommended in week two. Advanced is for severe cases or stalled progress. Choose third-party tested, USP-verified or NSF-certified products.
| Tier | Supplement | Dose & timing | Why |
|---|---|---|---|
Essential | L-glutamine powder | 5 g, 2× daily, away from meals | The #1 amino acid for gut repair; primary fuel for enterocytes 9 |
Essential | Zinc carnosine | 75 mg, 2× daily, with food | The most clinically studied compound for restoring the lining 10 |
Essential | Collagen peptides | 10–20 g daily | Building blocks for new gut tissue and tight junctions |
Essential | Multi-strain probiotic | 50 billion CFU+, morning | Crowds out pathogens, reseeds beneficial flora |
Recommended | Saccharomyces boulardii | 5–10 billion CFU daily | Yeast probiotic; useful for SIBO and post-antibiotic |
Recommended | Digestive enzymes + HCl | 1–2 caps with each meal | Pre-digests food, replaces missing stomach acid |
Recommended | Slippery elm + marshmallow | 1–3 g daily | Mucilaginous herbs that soothe and coat the lining |
Advanced | Turmeric + ginger | 1–3 g daily | Curcumin reduces zonulin and gut inflammation |
Advanced | PHGG (Sunfiber) | 5–7 g daily | Slowest-fermenting prebiotic; increases Akkermansia |
Advanced | Butyrate (postbiotic) | 600 mg, 2× daily | Direct fuel for colon cells while fiber rebuilds 19 |
Already taking things? Run your routine through the Supplement Review to catch overlaps and totals before you add.
The five daily pillars
Supplements support healing. Lifestyle causes it. Most people get more results from doing these consistently than from any pill they take.
7–9 hours, same schedule every night including weekends
Cool, dark, quiet: 65–68°F, blackout curtains, no screens 60 minutes before bed
Magnesium glycinate 300–400 mg in the evening if you struggle to fall asleep
Walk 30+ minutes daily, ideally outside in the morning
Strength train 2–3× weekly — short, intense sessions, not endless cardio
No chronic over-training while healing; it spikes cortisol and worsens leaky gut
10 minutes of slow nasal breathing (4 in, 6 out) before phone or coffee
Humming, gargling, cold-water face dunks
10 minutes within 30 minutes of waking — outside, no sunglasses
20–30 minutes of midday sun for vitamin D, serotonin and immune balance
At least one meal a day with another person — eating in connection lowers cortisol
Weekly worship, prayer group or meaningful gathering; loneliness is biologically inflammatory and measurably raises zonulin
When the basics aren't enough: three therapies that move the needle
For severe cases, autoimmune patients or stalled progress, these are the three modalities I reach for first at The Longevity Clinic. None replace the foundation; all accelerate it.
- Ozone therapy (MAH or EBOO), a series of 6–10 sessions: the most powerful intervention I've found for chronic, stubborn cases, especially when infection (Lyme, EBV, mold, H. pylori) is part of the picture. Disrupts biofilms, modulates the immune system and reduces systemic inflammation.
- Hyperbaric oxygen therapy, 5–40 sessions: accelerates tissue healing, reduces gut inflammation, improves microbiome diversity and supports stem cell mobilization. Especially effective for longstanding gut damage or post-infection fatigue.
- IV nutrition (Myers, glutathione, NAD+), weekly to biweekly: a leaky gut means impaired absorption. IV nutrition bypasses the gut and rebuilds reserves of magnesium, B-complex, vitamin C, glutathione and amino acids.
Test, don't guess
Standard bloodwork won't catch leaky gut. Four functional tests give you the actual picture: what's broken, what's depleted and what to fix first. 12
| Test | Tier | What it tells you |
|---|---|---|
GI-MAP comprehensive stool analysis | Foundation | Maps your microbiome; finds parasites, SIBO, H. pylori, Candida |
Zonulin (stool or serum) | Foundation | Direct measurement of the protein that opens tight junctions — the best lab marker of leaky gut |
Lactulose-mannitol urine test | Functional | Functional measurement of how much actually passes through the gut wall |
Micronutrient panel | Foundation | Which vitamins, minerals and amino acids are depleted at the cellular level |
Nutrients commonly depleted with leaky gut: zinc, vitamin D, magnesium, B12 and folate, iron, vitamin A, omega-3s, glutamine and glycine. Replacing these is often the difference between feeling 70% better and feeling fully restored. Retest at 90 days — most patients see zonulin drop 30–60% and depleted nutrients restore. See the tests we run → · Interpret a result →
What to do when things stall
If you're not feeling better at 30 days, run through these four:
- Are you 100% off gluten, including hidden sources? Soy sauce, salad dressings, oats not labeled gluten-free. One slip resets the clock 1–2 weeks.
- Have you addressed your stress? If you haven't done daily breathwork, prayer or vagus work — start today.
- Could you have SIBO, parasites or H. pylori? Run a comprehensive stool analysis. Many “stalled” cases are infection-driven, not lining-driven.
- Are you eating enough protein? Under-eating drives cortisol. Aim for 0.7–1 g per pound of bodyweight.
The body, the mind and the spirit
The gut isn't only a digestive organ. In Scripture it's the seat of intuition; in Chinese medicine the spleen-stomach holds overthinking and worry. Most leaky gut patients I treat are carrying something — childhood instability, an unprocessed loss, an identity wrapped in performance, chronic worry — and the body keeps the score until the soul lets it go. Name what you're carrying and write it down. Forgive, yourself first: unforgiveness keeps cortisol elevated and the gut open. Don't carry it alone; a pastor, counselor or trauma-informed therapist can be the catalyst your body has been waiting for. Replace fear with truth and practice gratitude daily.
“Beloved, I pray that you may prosper in all things and be in health, just as your soul prospers.” 3 John 1:2
“A merry heart does good, like medicine, but a broken spirit dries the bones.” Proverbs 17:22
Frequently asked questions about leaky gut
How long until I feel better?
Most people see relief in 4–12 weeks. Full healing of the gut lining takes 3–6 months of consistency.
Do I have to give up gluten forever?
Try 90 days. Most people feel so much better they don't want to go back. If you do reintroduce, keep it occasional and organic, and watch your log.
Can my kids do this protocol?
Yes, a gentler version: bone broth, probiotics, and eliminating gluten, dairy and sugar. Skip the HCl and the advanced tier.
What if I have SIBO?
Address SIBO first with your practitioner and skip prebiotics until it clears. Heal the lining alongside.
Pregnant or breastfeeding?
The food-first phases are appropriate. Skip antimicrobial herbs and aggressive detox; focus on healing foods and probiotics, and check supplements with your provider.
Will my autoimmune condition go into remission?
Often symptoms improve dramatically with consistency — I've seen Hashimoto's, RA and psoriasis change course. Work alongside your physician; the protocol complements care, it doesn't replace it.
Is leaky gut a real diagnosis?
Intestinal permeability is a measurable mechanism with decades of research behind it; what's debated is how much of any one person's symptoms it explains. That's why the protocol tests, treats and retests.
The bottom line
You weren't built to be sick. You were built to heal. Remove what's breaking the strainer, replace what digestion needs, reinoculate gently, repair the lining, rebalance the life around it, and reframe the story you tell yourself — in that order, for 30 days, then retest. For most people this protocol is the complete map. For severe autoimmune, long-standing illness or complex cases, the next step is working with our team.
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References
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- DaFonte TM, et al. Zonulin levels in pediatric patients at risk for celiac disease. Pediatrics. 2024;153(1):e2023063050.
- Mesnage R, Antoniou MN. Glyphosate inhibits the EPSP synthase enzyme of human gut bacteria. Food & Function. 2024.
- Gallegos CE, et al. Lifelong low-dose Roundup exposure damages tight-junction proteins ZO-1 and ZO-2. Front Behav Neurosci. 2022;16:866473.
- Cayres LCF, et al. Gut microbiota and intestinal permeability in Hashimoto's thyroiditis. Front Immunol. 2021;12:579140.
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- Bischoff SC, et al. Intestinal permeability — a new target for disease prevention and therapy. BMC Gastroenterol. 2014;14:189.
- Fasano A. Zonulin and intestinal barrier function: door to inflammation, autoimmunity, cancer. Physiol Rev. 2011;91(1):151-175.
- Hollon J, et al. Effect of gliadin on permeability in celiac and non-celiac patients. Nutrients. 2015;7(3):1565-1576.
- Drago S, et al. Gliadin, zonulin, and gut permeability: effects on intestinal mucosa. Scand J Gastroenterol. 2006;41(4):408-419.
- Bjarnason I, et al. Mechanisms of gastrointestinal damage from NSAIDs. Gastroenterology. 2018;154(3):500-514.
- Hills RD Jr, et al. Gut microbiome: profound implications for diet and disease. Nutrients. 2019;11(7):1613.
- Lewis K, et al. Bacterial translocation across stressed epithelia reduced by butyrate. Inflamm Bowel Dis. 2010;16(7):1138-1148.
- Dinan TG, Cryan JF. Brain–gut–microbiota axis and mental health. Psychosom Med. 2017;79(8):920-926.
This content is for educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease. Supplement amounts are typical adult amounts from the reviewed library, not a prescription. Always consult a qualified healthcare provider before starting any new supplement or protocol, especially if you are pregnant, nursing, taking medication or managing a health condition.
