Leaky gut syndrome can be treated with a combination of dietary and lifestyle changes

 Leaky gut syndrome can be treated with a combination of dietary and lifestyle changes

The The human body is exposed daily to potentially harmful substances and agents. These infectious agents can upset the balance between health and disease. The gastrointestinal tract transports water and electrolytes and secretes water and protein towards the intestinal lumen. This action has a defense function that prevents harmful substances from entering the intestinal barrier. The intestinal barrier forms two complex layers, which consist of an apical barrier and basolateral barrier . The small intestine mixes food with digestive juices from the pancreas, liver, and intestine and pushes the mixture forward to continue the digestion process. The cellular walls of the small intestine absorb digested nutrients and drugs through diffusion, ATP-binding cassette (ABC) transporters and paracellular transportation into the bloodstream. The interaction of both barriers allows the maintenance and balance of intestinal homeostasis, which is capable of discriminating between commensal microorganisms (beneficial for the host), pathogens, nutrients and inflammatory particles. Under normal conditions, an intact intestinal barrier prevents the transmission of pathogens, pro-inflammatory substances and antigens to the internal environment. However, a lack of intestinal integrity favors its entry and could trigger a disease or inflammation [4]. Dysfunction of the intestinal epithelial barrier and increased permeability results in a “leaky gut” that is associated with intestinal disorders such as inflammatory bowel disease (IBD), bowel syndrome irritable liver disease (ILD), alcoholic liver disease, nonalcoholic fatty liver disease, steatohepatitis, liver cirrhosis, and collagen diseases . Leaky gut is also related to diseases that are not intestinal disorders such as diabetes mellitus, among others,

What are the symptoms of a leaky gut?

Leaky gut may cause or contribute to the following possible symptoms:

• Chronic diarrhea, constipation, or bloating.

• Nutritional deficiencies.

• Fatigue.

• Headaches.

• Confusion.

• Difficulty concentrating.

• Skin problems, such as acne, rashes, or eczema.

• Joint pain.

The How can I test for leaky gut?

The Leaky gut test involves collection of a urine sample following the ingestion of a testing solution. The solution contains molecules of different sizes and the rate that these molecules pass through the intestine is measured to give an analysis of intestinal permeability and tight junction activity.

Representation of the structure of the intestinal membrane showing the different routes of drug and nutrient transport.

Relat

Relationship between leaky gut syndrome and intestinal dysbiosis with various diseases. NAFLD: nonalcoholic fatty liver disease; NASH: nonalcoholic steatohepatitis; PBC: primary biliary cholangitis; SAP: severe acute pancreatitis; DM: diabetes mellitus; SIBO: small intestinal bacterial overgrowth; COPD: chronic obstructive pulmonary disease; CHF: congestive heart failure; CD: Crohn’s disease; UC: ulcerative colitis (ulcerative colitis); IBS: inflammatory bowel diseases

The incidence of inflammatory bowel and leaky gut diseases is on the rise in countries that adopt a Western lifestyle. Its pathogenesis is not well defined, but it is associated with multifactorial causes. However, in genetically predisposed individuals, different environmental factors trigger alterations in the immune response; as a result, tolerance towards the commensal intestinal microbiota is lost, causing tissue damage and chronic inflammation. Among the environmental risk factors is diet. Diets high in sucrose, refined carbohydrates, polyunsaturated fatty acids, and omega-6 and low in fiber are associated with an increased risk of presenting these intestinal disorders [9]. Nutritional recommendations for its control cannot be generalized since all patients do not respond in the same way. The emergence of disciplines such as nutrigenetics, nutrigenomics and epigenetics allows a greater understanding of the pathogenesis of this disease and, in turn, opens the possibility of an individualized approach from a nutritional point of view. The research on treating the intestinal permeability is mostly based on avoidance of high amounts of sugar and fat and implementation of FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols), prebiotics, probiotics, fibers, glutamine, short-chain fatty acids, quercetin, and metformin [2]. There are some functional foods and ingredients that have shown great potential in treating leaky gut. Some herbs, polyphenols, amino acids, minerals, antioxidants, and food products could increase functionality against intestinal permeability. Therefore, this review article aims to explore foods and ingredients that can help prevent or treat leaky gut syndrome.

Components of the Intestinal Barrier

The composition and anatomical structure of the gut barrier is shown in below image. From top to bottom, there is a microbiota barrier, a chemical barrier, a physical barrier, and an immune barrier. The chemical barrier contains microorganisms, immunoglobulin A (Ig A), mucins, AMPs (adenosine monophosphates) and antibacterial peptides. The physical barrier comprises intestinal epithelial cells (IECs), goblet cells (synthesis and release of mucins), Paneth cells (synthetic AMPs), and intestinal stem cells. The immune barrier is mainly consists of T cells, B cells, macrophages, dendritic cells (DC), and mast cells.

Composition and anatomical structure of the gut barrier.

The first line of defense is found in the gastrointestinal tract and the intestinal lumen. The intestinal barrier constitutes the interface between the external and internal environment [10]. It comprises various physical, cellular, and chemical components that contribute to immunological functions

Secondly, it is essential to consider the microflora from the mucus. The mucus varies throughout the intestine. In the small intestine, the mucus forms a thin, discontinuous layer, which facilitates the absorption of nutrients, while in the large intestine, it has two layers.

Thirdly, the intestinal epithelium, with its tight junctions, is the essential component of the intestinal barrier and separates the microbiota from underlying immune cells forming an epithelial barrier [15]

Intercellular junctions of the intestinal epithelium.

Gut Microbiome and Leaky Gut

The gut has more than 100 trillion bacteria [27], with an aggregate biomass of approximately 1.5 kg [28], composed of more than 200 microbial strains in an individual and more than 90% of the dominant bacterial species belonging to the phylum Firmicutes and Bacteroidetes [29,30]. The genome has between 20,000 and 25,000 protein-coding genes, while the genome of the bacterial community in the human intestine is approximately 9 million genes [31], capable of providing characteristics that the human genome does not possess.

The implications of the microbiota in the health of individuals are very numerous, from the stimulation of the immune system [10,33,34], the degradation of dietary fibers, the increase in function and motility of the gastrointestinal tract facilitate the absorption of nutrients and the inhibition of pathogens. 

Bacterial metabolism also degrades plant polysaccharides and generates short-chain fatty acids that represent ≥10% of the calories absorbed daily by an individual [28]. In addition, the microbiota produces other beneficial metabolites such as polyamines [37] and vitamins (B and K). However, it can also produce harmful metabolites such as ammonia from urea and uremic toxins such as trimethylamine N-oxide (TMAO), p-cresyl sulfate (PCS), and indoxyl sulfate (IS),

Diseases Related to the Alteration of Intestinal Permeability

1. Inflammatory Bowel Disease

2.  Irritable Bowel Syndrome and Other Intestinal Disorders

3. Obesity

4. NASH and NAFLD

5. Chronic Heart Disease

6. Celiac Disease

7. Type 1 Diabetes Mellitus

Factors That Influence Intestinal Permeability

 Dysbiosis

The dynamic interactions between the gut microbiota and the immune system are significant for maintaining intestinal homeostasis and inhibiting inflammation, as well as for understanding the importance of dysbiosis [58]

Effect of various components of the diet on the permeability of the intestinal epithelium. The components that decrease intestinal permeability appear on the upper part of the figure and those that increase it appear on the lower part of the figure.

 

Effect

Infections

Infections can also play a role in disrupting the intestinal barrier. For example, Helicobacter pylori infect the human stomach. This bacterium is known to increase intestinal permeability due to the redistribution of the ZO-1 protein from the TJ [62].

Antibiotics and Drugs

The gut microbiota can also be affected by antibiotics or other drugs. A study on the effects of antibiotics with different modes of action on the composition of the human microbiota showed that antibiotic treatment could increase or decrease certain species of the intestinal microbiota [64].

Alcohol

Animal studies have shown that alcohol could cause increased intestinal permeability, depending on the dose and time of administration of alcohol, and decreases in the hydrophobicity of the mucosal surface (a physiological marker of mucosal barrier function) associated with increased levels of free fatty acids in the intestinal lumen. These results suggest that alcohol can cause loss of intestinal barrier function by extracting and dissolving intestinal mucosal lipids with a resulting decrease in the hydrophobicity of the mucosal surface, which is a critical component of intestinal barrier function [67].

Stress

On certain occasions, stress can affect the development of the intestinal barrier and be associated with increased gut permeability [69]. An example of this type of stress is burns and alcohol consumption, which we have referred to in the previous section. Burn injury, mediated by myosin light-chain (MLC) kinase activity, results in an increase in gut permeability.

Diet

The diet strongly influences the microbial composition and functions of the gut. Diet has a dominant role in the configuration of the intestinal microbiota since dietary components can significantly alter gastrointestinal functions, compromising the intestinal barrier’s integrity [71].

Ingredients That Help Treat Leaky Gut

1. FODMAP
   Probiotics
   Vitamins
   Fibers and Short-Chain Fatty Acids
   Glutamine
   Arginine
   Polyphenols
   Medical Herbs
   Mushrooms
   Other Foods That Can Potentially Help Treat Leaky Gut

   
   

   <Sources: https://pmc.ncbi.nlm.nih.gov/articles/PMC9862683/>

Diet

Eat probiotics
Probiotics help maintain gut health by preventing harmful bacteria from overgrowing. You can find probiotics in yogurt, kefir, kimchi, sauerkraut, and miso. 

Eat prebiotics
Prebiotics feed the good bacteria in your gut. You can find prebiotics in whole grains, bananas, onions, garlic, and vegetables. 

Prebiotics and probiotics are food ingredients that can improve gut health and overall well-being. Prebiotics are non-digestible fibers that feed beneficial bacteria in the gut, while probiotics are live microorganisms that help balance the gut's bacterial community. 

Prebiotics

What they are: Non-digestible fibers that feed beneficial bacteria in the gut 

Where they are found: Fruits, vegetables, whole grains, and legumes 

Benefits: Improve digestive regularity, nutrient absorption, and blood sugar control 

What is the best probiotic?

Some of the most frequently studied and recommended probiotics include:

• The Lactobacillus genus, including L. acidophilus, L. rhamnosus, L. casei and L. plantarum.

• The Bifidobacterium genus, including Bifidobacterium longum and Bifidobacterium breve.

Probiotics

What they are: Live microorganisms that help balance the gut's bacterial community 

Where they are found: Fermented foods like yogurt, kefir, sauerkraut, and kimchi 

Benefits: Improve digestive health, boost the immune system, and may help with weight management 

How they work together 

• Prebiotics and probiotics can be taken together, which is called a symbiotic combination

• Prebiotics act as a food source for probiotics, so taking them together can make it easier to get into the habit Potential health benefits

• Prebiotics and probiotics may help with digestive health, immune system function, and metabolic health 

• They may also help reduce the risk of certain diseases, such as colorectal cancer 

• Eat anti-inflammatory foods
  Eat foods rich in omega-3s, like salmon, flaxseeds, and chia seeds. You can also try spices like turmeric and ginger. 

• Eat a low-FODMAP diet
  This diet can help you identify food triggers and give your gut a chance to repair. FODMAPs are short-chain carbohydrates that can cause bloating and flatulence. 

• Eat a balanced diet
  Eat foods that provide all the necessary macronutrients and micronutrients. 

• Reduce dietary fats and sugars
  These can encourage the growth of harmful bacteria and yeast. 

Lifestyle 

• Exercise regularly: Regular physical activity can strengthen your digestive system.

• Manage stress: Try meditation or deep breathing exercises.

• Get enough sleep: Adequate sleep can promote gut healing and repair.

• Reduce alcohol consumption: Excessive alcohol consumption can trigger inflammation.

• Quit smoking: Smoking can increase inflammation and harm gut health.

Minimize unnecessary use of antibiotics: Antibiotics can disrupt gut microbiota balance.

You can also try taking collagen peptides or bone broth, which contain amino acids and minerals that can help heal the gut lining.

The intestinal microbiota is essential to maintain the intestinal epithelium’s integrity and homeostasis. A qualitative and quantitative imbalance in the composition of the intestinal microbiota or dysbiosis contributes to intestinal barrier dysfunction and leaky gut syndrome. Certain infections, an unhealthy diet, stress, excessive use of antibiotics and other drugs, and alcohol can influence increased intestinal permeability and cause leaky gut syndrome. The intestinal hyperpermeability produced in leaky gut syndrome leads to an alteration of the tight junctions, the entry of toxic agents into the blood, and dysfunction in organs and systems. Leaky gut syndrome therapy should include diet modification avoiding fats, sugars, additives, and ultra-processed foods, and the appropriate supplementation of probiotics/prebiotics, arginine, glutamine, polyphenols, vitamins, fibers, medical herbs, edible mushrooms, and FODMAPs. Several studies have shown that these ingredients influence the modulation of intestinal immunity, regulation of the intestinal epithelial barrier, amelioration of mucosal abnormalities, and growth of epithelial cells. This review delivers recent insights into the critical functions of the dietary ingredients proposed to maintain intestinal barrier functions. Nevertheless, most of the studies are based on animal models, and more well-designed clinical trials are required to address the potential of these ingredients when regulating intestinal barrier dysfunctions.

Diet