Could you have a ‘gut leak’ or ‘leaky gut’?
…Sorry what!?
Leaky Gut and IgG Food Intolerance.
Cracking the code to better health.
Firstly, a quick disclaimer, ‘gut leak’, ‘leaky intestine’, ‘leaky stomach’ or many variations on search terms we’re apparently asking Dr. Google or our smart speakers about, do not need to cause panic and are certainly not as graphic as they may sound!
However, as a possible missing piece to the puzzle of food intolerance, inflammation and conditions such as IBS and migraine, if those gory sounding taglines linked to leaky gut have got your attention, you need to read on!
Interest, awareness and suspected prevalence of food intolerance is soaring with somewhere between 20% and 60% of the population potentially having uncovered food intolerances or sensitivities responsible for irritating and unexplained symptoms like bloating, IBS, low mood, migraine, acne and eczema. (1) (2)
So what on earth is a ‘leaky gut’ and how may it be affecting you?
Within our digestive system, the cell structures responsible for regulating what passes from the intestine into the bloodstream, are known as tight junctions. Think of them like Doormen, deciding who they’re going to let into a Nightclub in hopes of avoiding any trouble! Natural microscopic holes in our gut lining exist which allow nutrients and beneficial compounds to pass from our gastrointestinal tract into our bloodstream but there is a limit to how big we want those holes, ensuring that harmful substances such as toxins, microbes, undigested food particles and antibodies are not allowed to enter the blood stream. If we let these ‘troublemakers’ into the blood stream, it can trigger widespread inflammation, immune responses and disruption to our health (3).
Compromised intestinal permeability or sub-optimal integrity of the mucosal epithelial barrier (the fancy names for ‘leaky gut syndrome’) are when the microscopic holes in out gut lining become too big!
When a leaky gut is lurking, it opens the possibility for normally ‘harmless’ food proteins to be absorbed from the intestine into the blood stream. The body’s immune system may then incorrectly recognise these food proteins as harmful and begin exerting an immune attack against these perceived threats.
Repeated exposure to these foods may lead to recurrent upregulation of IgG antibody production, as measured within the blood in the FIT Premium Food |Intolerance Test. IgG production can trigger a cascade of inflammation and cellular damage which could be linked to symptoms experienced by those with food intolerance. Digestive system dysfunction and disease often coincides to the increased detection of IgG antibodies stemming from food antigen ingestion.
However, as you may have experienced, food intolerance symptoms are not always black and white. You know how you can eat a meal at your favourite restaurant one week and be fine, but then have the same thing a few weeks later and your IBS flares up something chronic? It is thought that selectivity of response to certain food intolerances may come from the type and quantity consumed and the impact of a leaky gut on digestion and absorption (4).
Unlike food allergies, which involve IgE antibodies and can cause immediate and severe reactions, food intolerance often involves different pathways and antibodies (IgG) and results in delayed responses. Symptoms can range from gastrointestinal discomfort to headaches and fatigue, making it harder to pinpoint the offending food (5). At FIT Nutrition & Testing clinic we offer simple and effective testing for both Food and Environmental Allergy and Food Intolerance.
FIT's Advanced Food Intolerance Assessment (using the UK leading lab partner, York Test) enables identification of IgG food reactions and with the expert support of a fully qualified Nutritional Therapist (Becki), we offer a patient-centred focus to build an optimal dietary regime, often including temporary reduction or elimination of ‘suspect’ foods. Studies seem to indicate that the optimal period for an initial elimination protocol based on IgG Food Intolerance testing is around 12 weeks. (6). A diet based on food-specific IgG test results, has shown to be a safe and effective treatment for patients with chronic conditions such as IBS and migraine with potentially life-changing positive results (7) (8).
The integral empathy, clinical application and communication skills of Becki at FIT Nutrition & Testing Clinic are just as vital to supporting clients as the scientific evidence and laboratory accuracy behind the testing itself (9).
At FIT, results are never handed over in isolation — they are carefully interpreted, personalised and translated into clear, practical action that fits real life.
What about food intolerance symptoms that aren’t gut related?
The IgG antibodies and elements of the food proteins detected as harmful create immune complexes. These complexes move around the body in our incredible network of blood vessels. The destination cells could be within an organ away from the digestive system, this could be the root of how inflammatory symptoms associated with food intolerance can be experienced beyond the digestive system via seemingly unrelated systems such as the skin, urinary tract, joints or brain (3) (8).
What causes a leaky gut?
Often complex, and rarely down to one single causative factor, theories on leaky gut development range from infection, toxins and trauma to certain foods, medications and environmental chemicals. Our genetics may play a part, our modern sterile environments could be linked (hygiene theory) and even natural ageing can lead to the weakening of gut barrier wall cells, plus lowered stomach acid secretion and changes in the balance of our gut microbiome (10).
Is Leaky Gut Syndrome linked to the gut microbiome?
Absolutely! An imbalance between the ‘good’ and ‘bad’ microbes within our gut (and other bodily systems) i.e. dysbiosis, can influence the permeability of the gut lining and affect our immune system, digestive health and even mental health. (11)
Research shows that an IgG elimination diet combined with probiotics may benefit migraine plus IBS (12), so supporting your gut microbiome through probiotic foods and supplementation could be one approach to reducing food intolerance symptoms. Providing a range of ‘good bacteria’ strains in a probiotic supplement may be a positive step towards broad-spectrum gut support.
Can a leaky gut be repaired?
Clinical research has suggested a variety of nutrients, enzymes, herbs and essential fatty acids may play a role in preventing damage to the gut lining by nourishing the growth of preferential microbes and ‘’shrinking’’ the microscopic holes in a leaky gut by stimulating the regeneration of damaged intestinal lining cells. (13)
Glutamine, an amino acid is a major nutrient used to maintain intestinal barrier function and has been shown to improve gut barrier function in several experimental conditions (14). Glutamine is widely revered as the most important nutrient for the healing of leaky gut syndrome as it acts as the primary fuel to strengthen and repair gut lining cells (15).
Uncovering underlying intolerances and implementing a temporary elimination of the reactive foods, whilst also supporting the mechanics of digestion, leaky gut and dysbiosis forms an ‘outside in’ AND ‘inside out’ protocol. Could this be the key to cracking the code and bettering YOUR health?
References
1. Gaby A. Food allergy: Nutritional Medicine 2nd ed. Concord, NH: Frits Perlberg Publishing; 2017. Pp.23-30. 60% of the
2. Immunoglobulin G food testing - Annals of Allergy, Asthma & Immunology
3. Role of immunoglobulin G antibodies in diagnosis of food allergy - PMC
5. Food Intolerance* is not the same as Food Allergy? | YorkTest
7. IgG-based elimination diet in migraine plus irritable bowel syndrome - PubMed
8. Ritz BW, Lord RD. Case study: The effectiveness of a dietary supplement regimen in reducing IgG mediated food sensitivity in ADHD. Altern Ther Health Med May-Jun 2005;11(3):72-5.https://pubmed.ncbi.nlm.nih.gov/15943133/
9. IgG-based elimination diet in migraine plus irritable bowel syndrome - PubMed
11. Partners in Leaky Gut Syndrome: Intestinal Dysbiosis and Autoimmunity - PMC
13. Leaky Gut and the Ingredients That Help Treat It: A Review - PMC
14. Glutamine and the regulation of intestinal permeability: from bench to bedside - PubMed
15. Glutamine and barrier function in cultured Caco-2 epithelial cell monolayers - PubMed
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About Becki Hawkins
Becki Hawkins, BSc (Hons), mBANT, CNHC, is the founder of FIT Nutrition & Testing Clinic and a Registered Nutritional Therapist with over 20 years of experience. She specialises in evidence-based personalised nutrition and functional testing, helping clients uncover the root causes of digestive issues, hormonal imbalances, and unexplained symptoms. Becki combines clinical expertise with culinary creativity, translating complex test results into practical, delicious nutrition plans that work in real life. Her approach is simple: test, don't guess. Because guessing doesn't heal. Knowing does.