Could Your Food Be Making You Sick?
Bloating after bread, headaches after wine, fatigue after dairy – food intolerances are a hidden epidemic. Unlike food allergies, which cause immediate and often dramatic reactions, intolerances are subtler. Symptoms can appear hours or even days after eating the trigger food, making them incredibly difficult to identify without systematic investigation.
At our practice in Zürich Seefeld, I see a significant number of patients whose chronic symptoms – digestive issues, skin problems, fatigue, joint pain, brain fog – are driven or worsened by food intolerances they did not know they had.
Food Intolerance vs. Food Allergy – An Important Distinction
A true food allergy involves the immune system (IgE antibodies) and can cause anaphylaxis – it is immediate and potentially life-threatening. A food intolerance involves different mechanisms: enzyme deficiency (lactose intolerance), transport protein issues (fructose malabsorption), pharmacological reactions (histamine), or other non-IgE immune responses. Intolerances are not life-threatening but can profoundly affect quality of life.
The Most Common Food Intolerances
Lactose intolerance: Deficiency of the enzyme lactase means lactose ferments in the colon, producing gas, bloating, cramping, and diarrhoea. It affects up to 75% of the global adult population, though prevalence varies significantly by ethnicity.
Fructose malabsorption: When the small intestine cannot fully absorb fructose, it reaches the colon and is fermented by bacteria. Symptoms mirror lactose intolerance. Fructose is ubiquitous – found in fruits, honey, agave, and many processed foods.
Histamine intolerance: When your body cannot break down histamine efficiently (often due to low diamine oxidase enzyme activity), histamine accumulates and causes a wide range of symptoms: headaches, flushing, hives, nasal congestion, digestive issues, anxiety, and even heart palpitations. Histamine-rich foods include aged cheese, wine, fermented foods, cured meats, and certain fish.
Gluten sensitivity (non-coeliac): Some individuals react to gluten without having coeliac disease. This is a controversial but increasingly recognised condition characterised by digestive and extra-intestinal symptoms that improve on a gluten-free diet.
FODMAP sensitivity: Fermentable oligosaccharides, disaccharides, monosaccharides, and polyols are short-chain carbohydrates that are poorly absorbed and rapidly fermented. FODMAP sensitivity is particularly common in IBS patients.
Sorbitol and other sugar alcohols: Found in sugar-free products, some fruits, and many processed foods, these can cause significant gastrointestinal symptoms even in small amounts.
How We Test for Food Intolerances
At our practice, I use evidence-based testing methods. Hydrogen breath tests reliably diagnose lactose, fructose, and sorbitol malabsorption as well as SIBO. Blood tests can rule out coeliac disease (tissue transglutaminase antibodies) and assess diamine oxidase levels for histamine intolerance. I may also check for IgG4 food panels in specific clinical contexts, though I interpret these cautiously. A structured elimination diet with systematic reintroduction remains the gold standard for identifying triggers that tests may miss.
What We Do: Finding Your Personal Triggers
Systematic testing: Rather than guessing, I use targeted diagnostics to identify your specific intolerances. This prevents unnecessary dietary restrictions and ensures we address the right triggers.
Guided elimination and reintroduction: I design a personalised elimination protocol and guide you through the reintroduction phase, which is the most critical and often most confusing part.
Enzyme support: Lactase supplements, diamine oxidase (DAO) supplements for histamine intolerance, or digestive enzyme blends can make a significant difference while underlying issues are addressed.
Gut healing: Food intolerances often worsen when the intestinal barrier is compromised. Supporting gut barrier integrity with targeted nutrients (L-glutamine, zinc carnosine, vitamin D) can improve tolerance over time.
Microbiome optimisation: A healthy, diverse microbiome improves overall digestive capacity and can reduce sensitivity to trigger foods.
Conclusion
Food intolerances are real, common, and treatable. You do not need to live with chronic symptoms or eliminate foods based on guesswork. A systematic, evidence-based approach can identify your specific triggers and help you enjoy eating again. If you suspect food intolerances are affecting your health, I welcome you to our practice in Zürich Seefeld for a thorough evaluation.
