The full library

Gut Health

This is the broadest collection on GutCode—every guide touching digestion, gut healing, fasting, and fermented foods. Start here if you're not sure where else to look.

103 guides
Guide
70% of Your Immune System Lives in Your Gut
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Guide
A1 vs A2 Casein: Why Dairy Causes Gut Inflammation (And It's Not the Lactose)
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Guide
Akkermansia muciniphila Degrades the Mucus Layer of Your Gut
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Akkermansia muciniphila
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Akkermansia Muciniphila: The Gut Barrier Bacterium That Changes Everything
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Akkermansia Muciniphila:The Gut Barrier Bacterium
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Alcohol and Gut Health: How Drinking Systematically Destroys Your Microbiome
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Alcohol and the Gut Microbiome
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Best Fiber Supplements for Gut Health (2026)
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Guide
Best At-Home Gut Microbiome Test 2024
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Guide
Bile Acids Are Not Just Digestive Detergents
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Bile Acids & Your Gut Microbiome
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Bile Acids: Primary vs Secondary Synthesis, FXR and TGR5 Receptor Signaling…
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Guide
Butyrate & Short-Chain Fatty Acids: The Complete Colon Health Guide
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Candida Overgrowth in the Gut: What the Evidence Actually Shows
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Candida Overgrowth
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Candida Overgrowth: Separating Real Science From Wellness Mythology
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Chronic Constipation: Fiber Types, Osmotic Laxatives & Gut Motility
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Celiac Disease: How Gluten Destroys the Gut Lining and How It Heals
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Circadian Rhythm and the Gut Microbiome
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Colorectal Cancer Prevention
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Constipation and Gut Health: Why Laxatives Are the Wrong Default
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Constipation and Gut Motility
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Crohn's Disease & the Gut Microbiome
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Crohn's Disease
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Dietary Fiber, Gut Microbiome, and Butyrate
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1 in 3 adults over 40produce insufficient digestive enzymes
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Guide
Digestive Enzymes: Who Actually Needs Them and What the Evidence Shows
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Digestive Enzymes
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Diverticulosis & Diverticulitis
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Fermented Foods: Kefir, Kimchi, Sauerkraut and What the Science Actually Shows
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Foods That Destroy Your Gut: The Research-Backed Blacklist
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The Gallbladder–Gut Axis:How Bile Acids Run Your Microbiome
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Gallbladder Health
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Gut-Brain Axis: The Vagus Nerve, Enteric Serotonin, Psychobiotics, and What the…
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Guide
Gut-Brain Axis: How the Vagus Nerve Carries Microbiome Signals to the Brain…
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The Enteric Nervous System Contains 100 Million Neurons and Produces 90–95% of…
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The Gut-Brain Axis
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The Gut-Brain Axis
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Your Gut Controls Your Brain — Here Is the Mechanism
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The Gut-Brain Axis: How Your Microbiome Controls Your Mood
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Guide
Gut-Skin Axis: How Your Microbiome Affects Acne, Eczema, Rosacea, and Psoriasis
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The Gut-Skin Axis: How Your Microbiome Drives Acne, Eczema, and Rosacea
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Gut Health Recovery After Antibiotics
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The Gut-Sleep Axis: Why Your Microbiome Controls How Well You Sleep
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The Estrobolome: How Your Gut Microbiome Controls Your Hormones
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Gut Microbiome and Anxiety: The Gut-Brain Connection Explained
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Gut Microbiome Diversity
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Gut Microbiome Diversity: What It Is, Why It Matters, and How to Build It
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The Gut Microbiome: What Diversity Actually Means and How to Build It
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Gut Microbiome and Mental Health
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Your Gut Microbiome Is Harvesting Extra Calories From Your Food
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Gut Microbiome Testing Decoded
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Viome vs Genova vs Thryve: Which Gut Test Is Actually Worth It?
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Gut Microbiome and Weight Loss
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Gut Microbiome and Weight Loss: Separating Signal from Noise
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Gut Microbiome Diversity
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Gut Microbiome Diversity
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Gut Motility and Chronic Constipation
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The Migrating Motor Complex
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50% of the world's population carries H. pylori
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H. pylori: The Bacteria Living in Half the World's Stomachs (And How to Get Rid…
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How Gut Bacteria Actually Work: The Complete Science
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Guide
How to Actually Test for Leaky Gut: The 5 Most Reliable Biomarkers
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Irritable Bowel Syndrome
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Guide
IBS: The Gut-Brain Connection, Visceral Hypersensitivity, Microbiome…
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Guide
IBS Treatment Protocol: Gut Motility, Low-FODMAP Diet & Beyond
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IBS, the Low-FODMAP Diet, and the Gut Microbiome
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Intestinal Permeability and Leaky Gut
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Intestinal Permeability and Leaky Gut
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Guide
Intestinal Permeability Science
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The Gut Microbiome Is Not Static
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Intermittent Fasting and the Gut Microbiome
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Kefir vs. Yogurt: Which Has More Probiotics for Gut Health? (2026)
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Intestinal Permeability Testing
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Guide
Leaky Gut Healing Protocol: The 4R Framework with Evidence-Backed Interventions
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Leaky Gut (Intestinal Permeability)
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Leaky Gut & Intestinal Permeability
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Leaky Gut Is Real — But Probably Not What You've Been Told
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Guide
Intestinal Permeability Is Regulated by a Single Protein
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Leaky Gut and Intestinal Permeability
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Guide
Leaky Gut Syndrome
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Leaky Gut & Intestinal Permeability
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Leaky Gut: Real Science vs. Marketing Hype
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Guide
Microbiome Testing
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Guide
NAFLD & the Gut Microbiome: How Gut Dysbiosis Drives Fatty Liver Disease
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Oxalates & the Gut Microbiome
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Oxalate Sensitivity, Kidney Stones, and Your Gut Bacteria
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H. pylori, Triple Therapy Resistance & the Real Diet Evidence for Peptic Ulcers
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Polyphenols Are Not Absorbed by You
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Guide
The Gut-Brain Axis: Why Your Gut Controls Your Mood
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Guide
The Gut-Brain Axis: How Your Microbiome Shapes Mood, Anxiety, and Cognition
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Guide
The Gut-Brain Axis
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Guide
The Gut-Brain Axis
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Guide
The Gut-Brain Axis
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Guide
The Gut-Brain Axis
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The Gut-Brain Connection: A Science Explainer
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Guide
The 30-Day Gut Reset:A Science-Backed Roadmap
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Guide
The Gut-Brain Axis, Microbiome, and Depression
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Guide
Tryptophan Metabolism
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Guide
The Vagus Nerve & Gut-Brain Axis
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What’s Your Gut Health Score?
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Guide
What Fasting Actually Does to Your Gut Microbiome (The Science Is More Nuanced…
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Go beyond the guides
The 30-Day Gut Reset
the complete day-by-day clinical protocol — elimination, reintroduction, and repair, sequenced correctly and built from the same peer-reviewed research behind every guide on this site.
Get the Gut Reset → $19 or get all 4 health books for $49