Table of Contents
- Introduction
- Understanding the Spectrum: Allergy vs. Intolerance
- Factor 1: The "No-Time" Dough and Modern Baking
- Factor 2: The Ubiquity of Vital Gluten
- Factor 3: Changes in Wheat Breeding
- Factor 4: The Fragile Gut Microbiome
- Factor 5: Improved Awareness and Diagnostics
- The Smartblood Method: How to Find Your Triggers
- Using IgG Testing Responsibly
- Practical Steps for the Gluten-Sensitive
- Why Choose Smartblood?
- Conclusion
- FAQ
- Medical Disclaimer
Introduction
It is a scenario familiar to many people across the UK: you finish a meal that you have enjoyed for years—perhaps a simple sandwich or a bowl of pasta—and within an hour or two, the discomfort begins. It might start with a subtle sense of bloating, followed by a foggy head, or perhaps a sudden dip in energy that leaves you reaching for the kettle. For some, it manifests as more persistent "mystery symptoms" like skin flare-ups or joint niggles that never quite seem to clear up.
In recent years, the conversation around gluten has shifted from the fringes of health food shops to the aisles of every major supermarket. You may have noticed that more friends, colleagues, and family members are asking for the gluten-free menu or swapping their standard loaf for a sourdough or gluten-free alternative. This isn't just a passing trend; data suggests a genuine rise in the number of people reporting issues with wheat and gluten. But why is this happening now? Why is gluten intolerance increasing after centuries of wheat being a staple of the British diet?
At Smartblood, we believe that understanding your body shouldn't be a matter of guesswork. Whether you are dealing with chronic IBS and bloating or simply feeling "off" after eating certain foods, the answers often lie in a combination of modern agricultural changes, processing methods, and our own changing gut health.
Our goal is to help you navigate these symptoms with a clinically responsible, step-by-step approach. Before jumping into any restrictive diet, we always advocate for the Smartblood Method:
- Consult your GP first to rule out underlying medical conditions like coeliac disease, inflammatory bowel disease (IBD), or thyroid issues.
- Try a structured elimination approach, using tools like our free food elimination diet chart to track your symptoms.
- Consider testing only if you remain stuck or want a clearer "snapshot" to guide your dietary choices.
Understanding the Spectrum: Allergy vs. Intolerance
Before we explore the reasons behind the rise in gluten issues, it is vital to clarify what we mean by "intolerance." In the medical world, reactions to food generally fall into three distinct categories. Understanding where you sit on this spectrum is the first step toward safety and clarity.
Coeliac Disease
Coeliac disease is an autoimmune condition, not an allergy or a simple intolerance. When someone with coeliac disease eats gluten, their immune system attacks their own tissues, specifically damaging the lining of the small intestine. This can lead to severe nutrient malabsorption, anaemia, and long-term health complications. It affects roughly 1 in 100 people in the UK, though many remain undiagnosed.
Wheat Allergy (IgE-Mediated)
A true food allergy involves the IgE (Immunoglobulin E) branch of the immune system. These reactions are typically rapid—occurring within minutes to a few hours—and can be life-threatening.
Safety Note: If you experience swelling of the lips, face, or throat, difficulty breathing, wheezing, a rapid drop in blood pressure, or collapse after eating, you must seek urgent medical help immediately by calling 999 or attending A&E. These are signs of anaphylaxis. A food intolerance test is not appropriate for these symptoms.
Food Intolerance (IgG-Mediated)
When people ask why is gluten intolerance increasing, they are usually referring to Non-Coeliac Gluten Sensitivity (NCGS) or general food intolerances. These are often mediated by IgG (Immunoglobulin G) antibodies. Unlike allergies, these reactions are usually delayed, sometimes appearing up to 48 hours after consumption. This delay is exactly what makes them so difficult to identify without a structured approach.
At Smartblood, we focus on helping people understand these key differences between allergy and intolerance so they can take the right path toward feeling better.
Factor 1: The "No-Time" Dough and Modern Baking
One of the most compelling explanations for the rise in gluten sensitivity lies not in the wheat itself, but in how we turn it into bread. For thousands of years, breadmaking was a slow, deliberate process. Traditional sourdough or long-fermentation yeasted breads often sat for 12 to 24 hours before hitting the oven.
During this long fermentation, the wild yeasts and bacteria do some of the "heavy lifting" for our digestive systems. They break down complex proteins—including parts of the gluten molecule—and ferment the naturally occurring sugars in wheat known as fructans. Fructans are part of the FODMAP group (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols), which are known to cause significant gas and bloating in sensitive individuals.
In the early 1960s, the "Chorleywood Bread Process" was developed in the UK. This "no-time dough" method uses high-speed mixing and chemical additives to reduce fermentation time from hours to mere minutes. While this made bread cheaper and more accessible, it meant that the gluten and fructans remained largely intact when they reached the consumer's gut. For many, the result is a digestive system that struggles to process these "un-predigested" proteins, leading to the symptoms we now associate with intolerance.
Factor 2: The Ubiquity of Vital Gluten
If you look at the back of a modern food packet, you will often see "wheat gluten" or "vital wheat gluten" listed as a separate ingredient. This isn't just found in bread; it is used as a binder in sausages, a thickener in sauces, and a primary ingredient in many vegetarian meat substitutes.
Research suggests that while the protein content of wheat plants has actually remained relatively stable (or even slightly decreased) over the last century, our total dietary exposure to gluten has skyrocketed. We are consuming it in higher concentrations and in foods where it wouldn't naturally occur.
This cumulative load can reach a "threshold" for many people. You might be able to tolerate a small amount of gluten, but when it is hidden in your breakfast cereal, your lunchtime soup, and your evening stir-fry sauce, your body’s inflammatory response may eventually be triggered. If you find yourself feeling sluggish or constantly bloated, this cumulative exposure is often a major factor.
Factor 3: Changes in Wheat Breeding
There is a common myth that modern wheat is "genetically modified" (GMO) and that this is the sole cause of the intolerance epidemic. In reality, there is no commercially grown GMO wheat in the UK or the US. However, wheat has been extensively cross-bred over the last 120 years to increase yield and make it more resistant to pests and disease.
While this hasn't necessarily increased the amount of gluten, it has changed the composition of the proteins. Modern wheat varieties have been selected for higher levels of certain glutenin proteins that make dough stretchier and more "machine-friendly" for industrial bakeries. Some researchers believe these specific protein structures are harder for human enzymes to break down than those found in "ancient" grains like spelt or einkorn.
Furthermore, modern wheat contains higher levels of Alpha-Amylase/Trypsin Inhibitors (ATIs). These are natural proteins the plant uses to defend itself against insects. In humans, ATIs can trigger an innate immune response in the gut, contributing to inflammation and sensitivity even in those who don't have coeliac disease.
Factor 4: The Fragile Gut Microbiome
The rise in gluten intolerance isn't just about the food; it's also about the "environment" the food enters—our gut. Our microbiome is a complex ecosystem of trillions of bacteria that help us digest food and regulate our immune system.
Modern life has, in many ways, been a war on this ecosystem. Factors that can disrupt our gut health include:
- Overuse of antibiotics (which kill beneficial bacteria alongside the "bad" ones).
- A diet high in ultra-processed foods and low in diverse fibre.
- Chronic stress, which can increase intestinal permeability (often called "leaky gut").
- Sanitised environments that reduce our exposure to a diverse range of microbes.
When the gut barrier is compromised, larger undigested food particles—like gluten proteins—can "leak" into the bloodstream. The immune system then identifies these particles as foreign invaders and produces IgG antibodies against them. This is a primary reason why we see a rise in unmasking food sensitivities today.
Factor 5: Improved Awareness and Diagnostics
It is also possible that gluten intolerance isn't just increasing in reality, but also in our ability to recognise it. In decades past, someone with chronic fatigue or "tummy troubles" might have simply been told they had a "nervous stomach" or were "working too hard."
Today, both the medical community and the public are more aware of how diet influences systemic health. GPs are better trained to look for coeliac disease, and individuals are more empowered to investigate their own health. This increased awareness is a positive step, as it allows people to move away from "mystery symptoms" and toward a more optimised way of living.
The Smartblood Method: How to Find Your Triggers
If you suspect that gluten—or any other food—is causing you grief, it can be tempting to simply cut it out entirely. However, we recommend a more structured journey to ensure you aren't unnecessarily restricting your diet or missing a more serious diagnosis.
Step 1: Rule Out the Big Issues
Your first port of call should always be your GP. Ask for a coeliac blood test. It is crucial that you continue eating gluten during this testing phase; if you stop, the test may come back as a "false negative" because your body isn't producing the antibodies the test is looking for. This is also the time to rule out infections, anaemia, or other digestive disorders.
Step 2: Track and Eliminate
If your GP tests are clear but you are still suffering, it is time for some detective work. Use our free food elimination chart to record what you eat and how you feel. Sometimes the connection is obvious; other times, a reaction to gluten and wheat might not show up until the next day.
Step 3: Targeted Testing
If a simple diary doesn't give you the answers, or if you find yourself reacting to dozens of different foods and feel overwhelmed, a Smartblood Food Intolerance Test can provide a helpful "snapshot" of your current IgG reactivities.
We analyse your blood against 260 different foods and drinks, providing a 0–5 reactivity scale. This isn't a lifelong diagnosis; rather, it's a tool to help you prioritise which foods to temporarily remove and, more importantly, how to systematically reintroduce them.
Using IgG Testing Responsibly
It is important to be transparent: the use of IgG testing in food intolerance is a subject of ongoing debate within the clinical community. Some practitioners view IgG as a normal marker of food exposure, while others see it as a useful indicator of a heightened immune response or "gut leakiness."
At Smartblood, we don't present our test as a "magic bullet" or a standalone diagnosis. Instead, we see it as a practical tool to reduce the guesswork in an elimination diet. By identifying which foods are triggering the highest antibody response, you can create a more targeted plan. Our Scientific Studies section provides more depth on how this approach has helped people manage conditions like migraines and IBS.
Practical Steps for the Gluten-Sensitive
If you have confirmed a sensitivity to gluten through the Smartblood Method, the next question is: what now? For many, the answer isn't a permanent lifetime ban, but a change in how they consume wheat.
- Try Sourdough: Many people who react to industrial bread find they can tolerate traditional sourdough. The long fermentation helps break down the triggers.
- Watch the Additives: Focus on "whole" gluten-free foods like potatoes, rice, and quinoa rather than ultra-processed gluten-free substitutes, which are often high in sugar and low in nutrients.
- Check Your Drinks: Gluten can hide in places you might not expect, such as certain beers or malted drinks.
- Support Your Gut: Consider focusing on fermented foods (kefir, sauerkraut) and plenty of varied fibre to help rebuild a resilient microbiome.
If you are struggling with skin flare-ups, you might also want to look at our guide on food intolerance and skin problems, as gluten is a frequent culprit in conditions like eczema and dermatitis.
Why Choose Smartblood?
We began our story at Smartblood because we saw too many people struggling with "mystery symptoms" and getting no clear answers. We wanted to provide a service that was accessible, professional, and grounded in the belief that everyone deserves to understand their own body.
When you order our Food Intolerance Test, you receive a simple home finger-prick kit. Once you return your sample, our lab performs a high-tech ELISA (Enzyme-Linked Immunosorbent Assay) analysis—essentially a process that uses specific proteins to see if your antibodies "stick" to them. You typically receive your priority results via email within three working days of the lab receiving your sample.
We don't just leave you with a list of "red" foods; our results are designed to be the start of a productive conversation with your GP or a nutritional professional.
Conclusion
The question of why is gluten intolerance increasing has no single answer. It is the result of a "perfect storm": faster baking processes that leave triggers intact, a modern diet that hides gluten in almost everything, changes in how wheat is bred, and a modern lifestyle that has weakened our natural gut defences.
If you are feeling the effects of this shift, remember that you don't have to navigate it alone. Follow the path we recommend:
- Rule out coeliac disease with your GP.
- Use a diary to find the obvious patterns.
- Consider testing if you need a clearer map to guide your recovery.
The Smartblood Food Intolerance Test is available for £179.00. We occasionally have offers available; for example, if the code ACTION is currently active on our site, you may be able to secure 25% off your kit.
By taking a structured, evidence-based approach to your diet, you can move away from the frustration of "mystery symptoms" and back toward a life where food is a source of nourishment, not discomfort. If you have more questions about how we can help, please contact us or visit our FAQ page.
FAQ
Can I take a food intolerance test if I am already on a gluten-free diet? For the most accurate results, you should be consuming the foods you are testing for. If you have been strictly gluten-free for several months, your body may have stopped producing the IgG antibodies that the test identifies. We generally recommend that you continue your normal diet leading up to the test to ensure the "snapshot" is as accurate as possible.
How is a food intolerance different from a food allergy? A food allergy is an IgE-mediated immune response that is usually immediate and can be life-threatening. A food intolerance is often an IgG-mediated response (or a non-immune digestive issue) that is delayed and causes discomfort rather than an acute emergency. You can read more in our detailed guide on the differences.
Does your test diagnose coeliac disease? No. Coeliac disease is a specific autoimmune condition that requires medical diagnosis via blood tests for tTG antibodies and often a biopsy. Our test looks for IgG reactivities to help guide an elimination diet. You must consult your GP if you suspect you have coeliac disease.
How long does it take to get results from a Smartblood test? Once you have sent your finger-prick sample back to our accredited lab, we aim to provide your priority results via email within three working days. These results will group 260 foods and drinks into categories, with a clear 0–5 scale of reactivity to help you take action.
Medical Disclaimer
The information provided in this article is for educational and informational purposes only and does not constitute medical advice. You should always consult with your GP or a qualified healthcare professional before making significant changes to your diet or if you have concerns about your health. The Smartblood Food Intolerance Test is not a test for food allergies (IgE) or coeliac disease and does not provide a medical diagnosis. If you experience symptoms of a severe allergic reaction, such as swelling of the throat, difficulty breathing, or anaphylaxis, seek urgent medical attention immediately by calling 999 or attending A&E.
