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Leaky Gut: Causes, Symptoms and Treatment

Leaky gut refers to increased intestinal permeability, where the gut lining becomes weakened and allows harmful substances to enter the bloodstream, potentially triggering inflammation.

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Things worth knowing about "Leaky Gut"

Leaky gut refers to increased intestinal permeability, where the gut lining becomes weakened and allows harmful substances to enter the bloodstream, potentially triggering inflammation.

What is Leaky Gut?

Leaky gut, also known as increased intestinal permeability, is a condition in which the protective lining of the gut becomes compromised. Under normal circumstances, the intestinal wall acts as a selective barrier, carefully controlling which substances pass from the digestive tract into the bloodstream. In leaky gut, the so-called tight junctions – the protein structures that bind intestinal epithelial cells together – become disrupted. This allows bacteria, undigested food particles, and toxins to pass through the gut wall and enter the bloodstream. While leaky gut is a well-recognized concept in functional and integrative medicine, mainstream medical research is increasingly investigating its role in various chronic conditions.

Causes

Several factors can contribute to increased intestinal permeability:

Poor diet: High intake of sugar, ultra-processed foods, and alcohol can damage the intestinal barrier.
Chronic stress: Prolonged physical and psychological stress negatively affects gut function.
Medications: Long-term use of non-steroidal anti-inflammatory drugs (NSAIDs) and antibiotics can compromise the gut lining.
Dysbiosis: An imbalance in the gut microbiome promotes inflammatory processes within the intestine.
Inflammatory bowel disease: Conditions such as Crohn's disease and ulcerative colitis are associated with impaired intestinal barrier function.
Coeliac disease: This gluten-triggered autoimmune condition is well-documented to cause increased intestinal permeability.

Symptoms

Symptoms associated with leaky gut are diverse and often non-specific. Common complaints include:

Bloating, abdominal pain, and digestive issues
Chronic fatigue and exhaustion
Food intolerances and sensitivities
Skin conditions such as eczema or acne
Joint pain
Brain fog and mood disturbances
Frequent infections due to a weakened immune system

It is important to note that these symptoms can have many other underlying causes. A thorough medical evaluation is always recommended.

Diagnosis

There is currently no universally standardized diagnostic test for leaky gut in conventional medicine. However, the following assessments may provide useful information:

Lactulose-mannitol test: Measures intestinal permeability by comparing the urinary excretion of two sugars administered orally.
Stool analysis: Evaluation of the gut microbiome composition and inflammatory markers such as calprotectin or zonulin.
Blood tests: Assessment of systemic inflammatory markers and antibodies against food antigens.
Intestinal biopsy: During a colonoscopy, tissue samples can be examined for structural changes in the gut lining.

Treatment

Treatment of leaky gut focuses on addressing underlying causes and restoring the integrity of the intestinal barrier. Key approaches include:

Dietary Modifications

An anti-inflammatory, gut-friendly diet rich in dietary fiber and fermented foods (e.g., yogurt, kefir, sauerkraut), while avoiding alcohol and heavily processed foods, can significantly support gut health.

Probiotics and Prebiotics

Probiotics introduce beneficial bacterial strains that support a healthy microbiome. Prebiotics (e.g., inulin, psyllium husk) serve as food for these beneficial bacteria and encourage their growth.

Stress Management

Relaxation techniques such as yoga, meditation, or progressive muscle relaxation can help reduce stress-related impacts on gut health.

Supplementation

In some cases, supplements such as L-glutamine (an amino acid that nourishes intestinal cells), zinc, and specific vitamins are used to support regeneration of the gut lining.

Treatment of Underlying Conditions

When a diagnosed condition such as coeliac disease, Crohn's disease, or a food allergy is the root cause, targeted treatment of that underlying condition takes priority.

References

Fasano A. - Leaky gut and autoimmune diseases. Clinical Reviews in Allergy and Immunology, 2012; 42(1):71-78. PubMed.
Camilleri M. - Leaky gut: mechanisms, measurement and clinical implications in humans. Gut, 2019; 68(8):1516-1526. BMJ Publishing Group.
World Gastroenterology Organisation (WGO) - Probiotics and Prebiotics: Global Guidelines, 2023. www.worldgastroenterology.org

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