Symptom guide · Food & immune reactivity
I react to almost everything I eat — what does it mean?
The list of foods you cannot tolerate grows longer every month. This is often read as becoming allergic to more and more things. More often something else is going on — and the growing list is a symptom of it, not the explanation.
Clinical assessment by a licensed physician. Patients across Sweden and internationally.
4.87 ★★★★★ Patient reviews on Reco Based on verified patient reviews Reco.seVerifiedShort answer: when tolerance to food gradually narrows, true allergy is rarely the mechanism. The most common explanations are reduced digestive capacity, a gut lining with ongoing low-grade inflammation, delayed immune reactions to common foods, and a gut flora that has become less robust — often as a consequence of repeated elimination diets.
Common causes
True allergy is uncommon in this picture
IgE-mediated allergy produces rapid, predictable and often dramatic reactions to a small number of specific substances. That rarely matches a picture of gradually worsening tolerance to more and more foods.
Delayed immune reactions
Cellular immune reactions to foods appear hours to days after a meal. The delay makes them nearly impossible to identify with a food diary.
Reduced digestive capacity
If enzyme or acid production is insufficient, more foods become difficult to handle — not because they are harmful, but because they are not broken down sufficiently.
The gut lining is affected
With ongoing low-grade inflammation the lining becomes more easily irritated. Ordinary foods then produce symptoms, much as salt stings more in a wound than on intact skin.
The diet has narrowed
Each elimination reduces gut flora diversity, and a less diverse flora handles variation less well. This creates a self-reinforcing spiral.
When to seek care
The following should be assessed within conventional healthcare before any extended investigation. They are best excluded early and cost nothing to check.
- Swelling of the lips, tongue or throat — seek emergency care
- Breathing difficulty or hives with a meal — seek emergency care
- Unintentional weight loss or nutritional deficiency
- Blood in the stool
- Vomiting or difficulty swallowing
- Severely restricted diet over a long period
- Anxiety around meals or growing need to control food
No functional analysis replaces conventional medical assessment for these symptoms.
What can actually be measured
Several of the causes above can be investigated objectively. The table shows which measurement answers which question — which is warranted in your case depends on the symptom pattern, not on how comprehensive the panel is.
| Possible cause | What is measured | Analysis |
|---|---|---|
| Delayed immune reactivity to foods | Cellular reactivity to 250 foods (ALCAT 250) or 483 substances including additives and chemicals (ALCAT 483) | ALCAT immune reactivity |
| Inflammation in the gut lining | Calprotectin, EPX, secretory IgA | GI Effects® |
| Digestive capacity | Pancreatic elastase-1, faecal fat | GI Effects® |
| Gut flora diversity | Microbiome by PCR and short-chain fatty acids | GI Effects® |
| Bacterial fermentation in the small intestine | Hydrogen and methane in breath | SIBO Breath Test |
MediBalans is the exclusive Genova Diagnostics distributor in Sweden. Analyses are ordered after clinical assessment, sampling is usually done at home, and results are interpreted by a licensed physician alongside your history.
What you can do first
Stop expanding the elimination until you know why
Each new elimination without evidence narrows the diet and makes later investigation harder to interpret. A growing list is a reason to investigate, not to keep removing.
Rule out coeliac disease before removing gluten
Coeliac testing becomes unreliable once you have stopped eating gluten. The order matters — test first, eliminate after.
Record the delay, not only what you ate
Reactions within minutes, within hours and after a day point to entirely different mechanisms.
Pay attention to how you feel around food
If meals have become anxious or the need to control food is growing, that deserves help in itself, whatever the investigation shows.
Frequently asked questions
Can you become intolerant to more and more foods?
What you experience is real, but the explanation is rarely that the immune system has become allergic to more and more substances. More often digestive capacity is reduced or the gut lining is easily irritated, so more foods produce symptoms. The threshold has fallen, rather than the number of allergies having risen.
What is the difference between allergy and intolerance?
Allergy is an IgE-mediated immune reaction that appears rapidly and can be life-threatening. Intolerance usually concerns failing breakdown, for example lactose intolerance. In addition there are delayed cellular immune reactions to foods, appearing hours to days after a meal, which neither standard allergy testing nor a food diary captures well.
Why does a food diary not help?
Because a delayed reaction can appear up to a day after the meal. What you note as the cause is then usually the wrong meal. This is also why many end up eliminating more and more foods without improving.
Should I cut out gluten and dairy to be safe?
Not without first testing for coeliac disease, since that test becomes unreliable once you stop eating gluten. Prolonged eliminations without evidence narrow the diet and reduce gut flora diversity, which can worsen the picture over time.
Find out why
An initial consultation gives a clinical assessment of your situation and a clear next step — which investigation is warranted, and which is not.
Keep reading. Explore symptom guides, clinical notes, assessments and diagnostics in our knowledge base.
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