Leaky gut and it’s link to autoimmunity

A leaky gut or increased intestinal permeability?

While “leaky gut” or “leaky gut syndrome” is not officially recognized as a medical condition, intestinal permeability, its scientific counterpart, has been extensively studied. It’s associated with various diseases such as coeliac disease, inflammatory bowel disease, Type 1 Diabetes, food allergies, irritable bowel syndrome, Crohn’s disease, and cardiovascular disease.

In this article, I’ll use the term “leaky gut” for ease to indicate an increased intestinal permeability.

What is a leaky gut?

A leaky gut, or increased intestinal permeability, occurs when the tight junctions between the cells lining the small intestine loosen, allowing larger molecules like undigested food particles and harmful microbes to enter the bloodstream. This can trigger an immune response and lead to inflammation throughout the body. Chronic inflammation associated with a leaky gut can exacerbate a range of conditions, including digestive issues, brain fog, and joint pain.

What causes a leaky gut?

Several factors contribute to the development of a leaky gut:

1. Poor diet and inflammatory foods: Sugar, alcohol, and processed foods can increase inflammation and damage the intestinal lining, exacerbating a leaky gut. Additionally, food sensitivities or allergies can perpetuate the condition.
2. Stress: Chronic stress raises cortisol levels, contributing to a leaky gut and complicating gut health management.
3. Poor sleep: Inadequate or poor-quality sleep can impact gut health and increase intestinal permeability.
4. Antibiotics and medications: Antibiotics disrupt beneficial bacteria in the gut, while certain medications like NSAIDs and alcohol can increase intestinal permeability.
5. Intestinal dysbiosis and infections: Imbalances in gut bacteria, as well as infections from bacteria, parasites, or fungi, can trigger the release of substances like zonulin, further compromising gut integrity.

What foods can cause a leaky gut?

Several types of foods have been linked to leaky gut or increased intestinal permeability. These include:

1. Processed foods: Processed foods high in sugar, refined carbohydrates, unhealthy fats, and additives can contribute to inflammation and damage to the gut lining.
2. Gluten: Gluten, a protein found in wheat, barley, and rye, has been associated with increased intestinal permeability in some individuals, particularly those with celiac disease or gluten sensitivity.
3. Dairy: Some people may be sensitive to lactose or proteins found in dairy products, such as casein and whey, which can contribute to gut inflammation and permeability.
4. Lectins: Lectins are proteins found in many plant-based foods, such as grains, legumes, and nightshade vegetables, and may contribute to gut damage and increased permeability in some individuals.
5. Added sugars: Excessive consumption of added sugars, such as those found in sugary beverages, desserts, and processed foods, can disrupt the balance of gut bacteria and promote inflammation, contributing to a leaky gut.
6. Alcohol: Excessive alcohol consumption can irritate the gut lining, disrupt gut bacteria, and increase intestinal permeability.
7. Artificial sweeteners: Some studies suggest that artificial sweeteners may alter the gut microbiota and contribute to gut inflammation and permeability.
8. Food additives: Certain food additives, such as emulsifiers, preservatives, and artificial colours, have been linked to gut inflammation and permeability in animal studies, though more research is needed in humans.

It’s important to note that the relationship between these foods and leaky gut may vary among individuals, and what triggers symptoms in one person may not affect another. Additionally, a balanced diet rich in whole, unprocessed foods, fruits, vegetables, lean proteins, and healthy fats can support gut health and reduce the risk of a leaky gut.

What are the symptoms of a leaky gut?

Symptoms of leaky gut vary widely and can affect multiple body systems and may contribute to symptoms like:

• bloating, gas, gut pain, diarrhoea, or constipation
• brain fog
• joint pain
• mood changes
• skin lesions
• chronic fatigue syndrome
• gut issues in conditions like coeliac and Crohn’s disease.

However, it’s unclear whether a leaky gut is a cause or an effect of these health issues. Yet, reducing intestinal permeability often leads to symptom improvements.

Leaky gut and disease

Leaky gut is strongly linked to autoimmune diseases and liver conditions, affecting an estimated 25–87.5% and 17–65% of cases, respectively. It’s also associated with diabetes (30–65%), food allergies/hypersensitivity, irritable bowel syndrome (35.6%), polycystic ovary syndrome, and autism (36.7%). The severity of a leaky gut is directly related to the severity of symptoms. Additionally, a leaky gut is worsened by factors like dysbiosis (imbalanced gut bacteria), inflammation, and glucose metabolism issues.

A leaky gut is a significant factor in various health conditions and diseases. It should be considered during the diagnosis and treatment of patients with autoimmune diseases, non-alcoholic fatty liver disease, liver cirrhosis, polycystic ovary syndrome, irritable bowel syndrome, diabetes, autism, food allergies, and food hypersensitivity.

Leaky gut and autoimmune conditions

Increased intestinal permeability is believed to play a role in the development of various autoimmune conditions, but it is not necessarily involved in all autoimmune diseases. It’s not clear if a leaky gut plays a role in the progression and development of the disease or whether the disease causes a leaky gut.

Autoimmune conditions linked to increased intestinal permeability

Several autoimmune conditions have been associated with increased intestinal permeability, including:

• Inflammatory bowel diseases (IBD), such as Crohn’s disease and ulcerative colitis
• Coeliac disease
• Type 1 diabetes
• Multiple sclerosis
• Rheumatoid arthritis

In these conditions, increased intestinal permeability is thought to allow partially digested food particles, bacteria, and other substances to pass through the intestinal barrier and enter the bloodstream. This can trigger an immune response and lead to the development of autoimmune reactions.

Autoimmune conditions not directly linked to intestinal permeability

However, there are also autoimmune conditions where the role of increased intestinal permeability is less clear or not directly implicated, such as:

• Systemic lupus erythematosus (SLE)
• Hashimoto’s thyroiditis
• Graves’ disease
• Psoriasis

In these cases, other factors, such as genetic predisposition, environmental triggers, and dysregulation of the immune system, are thought to play a more significant role in the development of the autoimmune condition.

It’s important to note that the relationship between increased intestinal permeability and autoimmune diseases is an area of ongoing research, and our understanding of the underlying mechanisms is still evolving.

How to test for leaky gut?

Testing for leaky gut typically involves assessing markers of intestinal permeability. Two commonly used tests for leaky gut are the Cyrex Array 2 and the KBMO Gut Barrier Panel.

1. Cyrex Array 2: This is a comprehensive test that measures antibodies against lipopolysaccharides (LPS) and Occludin/Zonulin. Elevated levels of these antibodies may indicate increased intestinal permeability. A blood draw is required for this test.
2. KBMO Gut Barrier Panel: This panel measures zonulin, a protein involved in the regulation of intestinal permeability, as well as antibodies against lipopolysaccharides (LPS) and Occludin/Zonulin. Elevated levels of these markers may suggest a leaky gut. You can easily collect a finger-prick blood sample for this test in the comfort of your home. Simply send the sample to a lab for analysis.

These tests can provide valuable information about the integrity of the gut barrier and help identify potential contributors to leaky gut, such as dysbiosis (imbalance in gut bacteria), inflammation, and food sensitivities.

What to do about leaky gut?

As a nutritional therapist, I take a comprehensive approach to assessing leaky gut, considering symptoms and medical history in addition to specialized testing. Signs such as digestive issues, food sensitivities, autoimmune conditions, and ongoing inflammation can indicate its presence.

While leaky gut may appear complex, the solution lies in straightforward steps: embracing a nutritious diet, prioritizing healthy lifestyle habits like quality sleep, stress management, regular exercise, and integrating essential supplements. These measures can initiate the restoration of your intestinal barrier, resulting in significant symptom relief within a few weeks.

Are you ready to get your leaky gut under control? Nutritional therapy can help! Contact me directly to book an appointment and learn more about how I can support you throughout your wellness journey.