Do you suffer from allergies? If so, have you considered the health of your gut?
Our digestive and immune systems are very closely connected.
Leaky gut may contribute to food intolerances, sensitivities, and even seasonal allergies.
You might be thinking, doesn’t everyone suffer from allergies? Aren’t they normal? Well not exactly. Finding the root cause of this immune reaction is essential to curing your allergies or food sensitivities.
In this post, we will discuss the relationship between leaky gut and allergies and what nutritional supplements can heal the gut lining.
This post contains affiliate links: Visit the disclosure page for more information.
Table of Contents
What is a leaky gut?
The gut lining acts as a gut keeper by separating our digestive tract from our bloodstream. We absorb all of our nutrients through this gut lining too.
When we have a
Due to this, the immune system easily becomes overwhelmed. For this reason, we see so many different symptoms of a leaky gut. For one person it might be brain fog and anxiety while another suffers from allergies, eczema, and bloating.
With a leaky gut, the host (you) allows toxins, allergy compounds, and bacteria from the gut to enter the bloodstream.
Gut defensive mechanism
The frontline of this gut defensive mechanism is maintained by one single layer of specialized epithelial cells linked together by tight junctions. Mucins, immunoglobulins, and cytokines also aid in this process (R).
These tight junctions, located in the gut, allow digested food particles such as amino acids, fatty acids, simple sugars, vitamins, and minerals to cross into the bloodstream.
However, when the gut becomes leaky, unwanted substances leak into our blood. This can cause migraines, irritable bowel syndrome (IBS), skin conditions, malabsorption, allergies,
Signs and symptoms of leaky gut
Symptoms of leaky gut vary widely from person to person and the degree of leakage. Not only can leaky gut affect your digestive system but other parts of the body like your skin, mental clarity, and even joint pain.
Some other signs of leaky gut include:
- Constipation, bloating,
- Asthma and seasonal allergies (R)
- Food sensitivities or food allergies (R)
- Inflammatory bowel disease
- Autoimmune diseases including thyroid conditions, lupus, and rheumatoid arthritis (R)
- Skin conditions including eczema, dermatitis,
So, why does a leaky gut happen in the first place?
What causes a leaky gut?
Gut leakage may be responsible for a wide variety of health issues.
When someone suffers from celiac disease gut cells are damaged, which increases the permeability of the intestine lining when eating gluten. The body creates a chemical called zonulin which directly causes the tight junctions to open up (R).
Not only celiac disease but other individuals with autoimmune diseases such as type 1 diabetes may have high zonulin levels.
Undoubtedly, gluten is also not processed like in
Today gluten-containing foods are processed, sprayed, and stored in ways our gut cannot process. Therefore, removing gluten could help the gut repair and heal for many people.
Small intestinal overgrowth
Another potential cause of a leaky gut is small intestinal bacterial overgrowth (SIBO).
SIBO occurs when the bad bacteria outnumber the good. This imbalance can create inflammation and unwanted allergy symptoms.
When we have an allergic reaction our body releases histamine. The mast cells and basophils store and secrete histamine in response to toxins or immune IgE-mediated machines.
In addition, certain bacteria in the gut can also produce histamine. These bacteria include Citrobacter freundii and Morganella.
Keeping our bacteria in check helps to balance the release of histamine and decreases our chance of allergic reactions (R).
Other possible causes of leaky gut include:
- Poor Diet: aka Standard American Diet. The SAD is low in fiber and high in processed foods and refined sugars (R).
- Alcohol use also alters both the quality and quantity of microbiota (R).
- Medications: birth control, allergy medications, metformin, ibuprofen, and steroids (R).
- Nutrient deficiency: caused by medication interactions or lack of nutrients in the diet
- Gut Dysbiosis: Growing evidence has shown the gut microbiome to protect the epithelial barrier (R).
- Toxins in the environment
- Chronic stress: this can weaken and inflame the immune system. Sleep hygiene, meditation, and relaxation are crucial to proper gut healing.
- Irritable bowel syndrome (IBS)
Tip: Most of the immune system is located in the gastrointestinal tract.
How are leaky gut and allergies connected?
When the gut becomes permeable the tight junctions allow foreign substances and toxins into the bloodstream, the immune system attacks them.
Every time the immune system is activated it causes inflammation. If the gut is constantly leaking the immune system works overtime.
What type of allergies can leaky gut create?
About one-fifth of the world population experiences adverse dietary reactions.
IgE mediated -food allergies
When the gut microbiome is not in balance the health of the intestinal epithelial barrier and adaptive immune responses suffer (R).
Food sensitivity vs food intolerance
Adverse food reactions are divided into two categories (R).
Food intolerance is non-immune mediated and is caused by a variety of reasons. Examples include IBS, enzyme deficiency, or enzyme malfunction.
Food sensitivity or food allergy is an immune-mediated response.
This can be IgE-mediated or non-IgE-mediated. Most food allergies involve immunoglobulin IgE including celiac disease.
An IgE reaction occurs in the mast cells of the gastrointestinal mucosa layer. The mast cells are triggered by the allergens in the gut lining and inflammatory compounds are then released (R).
Ignoring food sensitivities can be harmful to the body.
The inflammation created by allergic reactions can make us feel crummy and long-term inflammation can be detrimental to our health.
Studies have shown people who suffer from food intolerances or food allergies commonly have increased intestinal permeability (R).
Not only is IgE immunoglobulin involved in an allergic reaction, so is IgA. In fact, IgA is produced in larger quantities than all other types of antibodies combined!
What is secretory IgA?
Secretory IgA (SigIgA) lives in the mucous secretion providing protection against pathogenic microbes while resisting enzyme breakdown and harsh environments.
SigIgA is the first line of defense against bacteria, undigested food, and even parasites (R). When the body comes across an allergen the B cells release SigIgA.
Every day the body produces about 50 mg/kg of IgA (R).
Deficiency of SigIgA is common with stressful lifestyles and heavily processed food items.
Low SigIgA is associated with a leaky gut and decreased immune system activity in the gut, which increases the risk of food sensitivities, IBS symptoms, and leaky bowel (R).
Are you curious about your IgA levels? You can test your SigIgA levels with a stool test.
What causes low SigIgA?
Chronic stress, medications, and antibiotics are some of the few causes of low IgA.
High cortisol levels due to stress are associated with decreased
Therefore, keeping stress levels low and having a well-balanced diet might help keep sigIgA at a normal level.
How to increase SigIgA and heal leaky gut
If you have allergies or food sensitivities increasing secretory IgA and healing the gut lining can improve allergy symptoms. The intestinal cells regenerate every couple of days so if dietary irritants are removed the gut can heal itself.
Healing your leaky gut means getting the gut microbiome back into balance.
Find the foods that trigger your symptoms and try avoiding them for a couple of weeks. Then slowly add them back one at a
Finally, let’s discuss possible supplement options to aid in the healing of your gut!
Supplements to heal leaky gut and allergies
Glutamine is known for reducing intestinal permeability and is the preferred fuel for intestinal cells (R).
To supplement glutamine, try 10 to 15 grams a day of 100% L-glutamine with 8 ounces of water in the
Colostrum is the first stage of cow’s milk and has been shown to increase SigA levels, which can help heal the gut, and reduce intestinal permeability in multiple studies.
For example, Bovine colostrum can increase Bifidobacterium longum (a bacteria which aids in the gut barrier function) (R).
Colostrum also contains immune proteins and immunoglobulins aiding in immune function (R). In addition, bovine colostrum decreases intestinal permeability (heals a leaky gut) and concentrations of zonulin in athletes (R).
Sovereign Laboratories Colstrum is an all-natural, concentrated source of immunoglobulins, lactoferrin, colostrum polypeptides, and growth factors that may help rebalance the body’s microbiome and promote a healthy immune system response.
To learn more about Colostrum and allergies read my last post.
Multiple studies show supplementing with probiotics or eating food rich in probiotics can treat gastrointestinal issues.
Supplementing with Saccharomyces Boulardii has been shown to restore intestinal barrier function and raise sIgA levels (R).
Eating foods rich in probiotics such as yogurt, kefir, sauerkraut, tempeh, and kombucha will help feed the good bacteria provide gut balance,
Seeking Health ProBiotia Bidido is a good probiotic for helping heal a leaky gut.
Mushrooms high in beta-glucans
Nowadays, mushrooms are popular foods due to their healing abilities in functional medicine.
They act like prebiotics to feed the microbes while providing vitamins and minerals. In addition, mushrooms contain high amounts of prebiotic polysaccharides known as beta-glucan which stimulate the immune system and feed the beneficial microbes in your gut (R).
Not only do mushrooms enhance t
Short-chain fatty acids
In the colon, microbial fermentation of undigested carbohydrates forms short-chain fatty acids including acetate, propionate, and butyrate.
Butyrate plays a particular role in maintaining the intestinal barrier (R).
Try eating a diet rich in prebiotics such as garlic, onion, asparagus, and bananas, which can increase the production of butyrate and protect the intestinal lining.
Designs for Heatlh Tri Butyrin is a highly-rated butyrate supplement.
Any indigestion of carbohydrates, protein,
Digestive enzymes also work to clean up the mucosal lining in the gut by breaking down toxins and harmful proteins (R).
Foods high in digestive enzymes include: (R)
Seeking Health ProDigestion Intensive is a good broad-spectrum enzyme supplement that may help both leaky gut and allergies.
Related post: The Best Digestive Enzymes for Bloating and IBS
Zinc is essential to cell turnover and repair systems in the body.
This trace mineral is known to support the immune and digestive systems. Inflammatory conditions are risk factors for zinc deficiency. A 2015 study found zinc to increase strength and regulate tight junctions (R).
Zinc carnosine is most often used to help heal the gut lining as far as supplements go.
When curing your allergies it often comes down to healing the gut while supporting the immune system.
Having a healthy sleep routine, moving your body,
Heidi Moretti, MS, RD is The Healthy RD. A registered dietitian for 23 years as well as a book author of the new book Gut Fix and The Whole Body Guide to Gut Health, Heidi has a passion for functional nutrition and natural medicine. She has researched supplements and natural medicine throughout her career. One of her biggest loves is helping people gain function and vitality by tackling the root causes of illness.
Disclaimer: The information on this website has not been evaluated by the Food & Drug Administration or any other medical body and is shared for educational purposes only. While The Healthy RD’s posts are backed by research, you are unique, so you must seek care from your own dietitian or healthcare provider. This post is not meant to diagnose or treat any conditions. Consult your doctor or healthcare provider before making changes to your supplement regimen or lifestyle.