Could various chronic physical ailments actually be caused by gluten intolerance?

Introduction: Your usual discomfort, could "gluten" be involved?

Many people suffer from symptoms such as migraines, chronic fatigue, unexplained anemia, constipation, and joint pain. Recently, "gluten" has been pointed out as being related to these chronic ailments, and with the spread of Westernized eating habits, it is gaining attention in Japan as well. When we actually tried changing our diet to be gluten-conscious, some members experienced reduced bloating and headaches, which made us strongly feel the importance of identifying the cause.

What is Gluten Intolerance? Types and Diagnostic Points

Differences between Celiac Disease, Wheat Allergy, and Non-Celiac Gluten Sensitivity

Celiac disease is an autoimmune reaction that damages the intestinal lining and is diagnosed by serum antibodies (e.g., tTG-IgA) and small intestinal biopsy. The prevalence is estimated to be around 1%. Wheat allergy is an immediate immune reaction (IgE) that can cause respiratory symptoms and anaphylaxis. Non-celiac gluten sensitivity (NCGS), on the other hand, is a group of symptoms that cannot be explained by celiac disease or allergies, and since there is no established diagnostic method, it is often identified through elimination and reintroduction.

Key Points for Diagnosis

First, undergo blood tests (tTG-IgA/total IgA) and allergy tests at a medical institution, and if necessary, consider detailed examinations (endoscopy/biopsy) at a gastroenterology department. If you stop gluten on your own beforehand, accurate test results may not be obtained, so it is wise to consult a doctor before changing your diet if you wish to be tested.

Range of Symptoms: Signs that can appear outside the digestive system

Digestive Symptoms (Diarrhea, Constipation, Bloating)

Many people complain of chronic diarrhea, constipation, and abdominal bloating due to intestinal inflammation and malabsorption. However, some people experience alternating diarrhea and constipation even with the same diet, indicating significant individual differences.

Migraines, Fatigue, Cognitive Decline

There are also cases of unexplained headaches, chronic fatigue, and what is known as "brain fog." In short-term elimination trials conducted by us and those around us, some reported a decrease in headache frequency, but this was not true for everyone.

Anemia, Joint Pain, Skin Symptoms

When the intestinal lining is damaged, the absorption of iron and folic acid can be inhibited, leading to anemia. There are also reports of improvement in joint pain and skin problems (eczema, itching), suggesting a potential link to systemic symptoms.

Distinguishing from Fructans (FODMAP) and Practical Ways to Test

It is crucial to determine if "gluten is truly the cause." Fructans (a type of fructooligosaccharide) found in wheat can cause bloating, gas, and bowel irregularities, and their symptoms are similar to those of gluten, making them easily confused. Fructans are also found in onions, garlic, asparagus, bananas, cashews, and other foods.

Practical Method: Elimination → Reintroduction Flow

Typically, after consulting with a doctor, undergo celiac disease screening, and if necessary, a biopsy. If it"s not celiac disease, observe symptoms during a 2-6 week gluten elimination trial. If no improvement is seen, consider a short-term trial of a low-FODMAP diet (restricting foods containing fructans). In both cases, during the reintroduction phase, gradually reintroduce small amounts of the original foods and record which foods cause symptoms to make the cause clearer.

Available Tests

Blood tests for celiac disease (tTG-IgA, etc.), IgE tests for wheat allergy, and in some cases, genetic tests (HLA-DQ2/DQ8) or breath tests (limited for fructan evaluation) are performed. For definitive diagnosis or severe cases, consult a specialist.

Daily Measures and Nutritional Considerations

• Base your staple foods on naturally gluten-free ingredients such as rice, brown rice, soba (100% buckwheat flour), quinoa, and various grains.
• Gluten-free processed foods are convenient, but be aware that some can be high in refined carbohydrates, fats, and salt.
• Iron, folic acid, B vitamins, and dietary fiber tend to be deficient, so if necessary, consult with a doctor or registered dietitian to supplement with supplements or foods.
• Keeping a food diary makes it easier to understand the relationship between symptoms and foods.
• If you have severe symptoms (rapid weight loss, persistent diarrhea, bloody stools, severe anemia, etc.), seek medical attention immediately.

Summary

Gluten intolerance can be associated with a variety of ailments, including not only digestive symptoms but also headaches, fatigue, anemia, and joint pain. However, it is dangerous to simply conclude that "gluten is the cause," as other components such as fructans are often involved. It is safest to first undergo screening at a medical institution and proceed with the elimination and reintroduction process with a specialist. Through trial and error, we have seen cases where symptoms improved, but also instances where dietary restrictions increased the burden. For long-term management, we recommend considering nutritional balance and quality of life, and proceeding with a specialist.

Disclaimer: The information in this article is for general informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional before making any health-related decisions.