Every claim has a named source. Not a test, not a diagnosis.

Honest answers about food intolerance

The food you suspect is often not the one your pattern flags to test.

Reactions are often delayed and add up across a day. The last thing you ate gets the blame; the pattern points somewhere else.

21guides and reference pages in English

85source citations across those pages

October 11, 2026last editorial review

Every health claim is tied to a named source and a review date: NHS, NICE, EFSA, WHO, FDA, AAAAI, EAACI, BSACI, British Dietetic Association, Monash University, SIGHI, Coeliac UK and peer-reviewed research. How we work

If you have spent months trying to work out which foods are causing your symptoms, and you are tired of guessing, this is a calm, sourced place to start. We explain what the evidence actually supports, in plain language. We do not diagnose anything, we do not sell a blood test, and we will tell you honestly when something is uncertain.

The short version. Food reactions are often delayed and dose-dependent, so the food you suspect is frequently not the one your own pattern points to. Symptoms are real; the suspect is often wrong. The way forward is to surface your patterns over time and bring them to a clinician, not to keep cutting foods.

Start where you are

"I react to everything and cannot find the trigger." Reactions are often delayed and add up over a day. Start with histamine intolerance and why the same food can be fine one day and not the next.
"My symptoms seem to track my cycle." If symptoms keep landing in a similar part of the cycle, the timing is worth looking at. See why bloating can track your cycle, not just your meals.
"Is it an allergy or an intolerance?" They are different things with different stakes. See allergy vs intolerance vs sensitivity for the 2-minute version.
"I paid for a food-sensitivity blood test." Read why IgG/IgG4 tests disappoint before you cut anything out.
"I am not sure how to explain my symptoms to a doctor." Walk in with evidence. Get the free doctor-visit prep guide.
"I think it might be MCAS." An evidence-based guide to MCAS symptoms and the low-histamine diet.

What we will not do

Most pages about food intolerance either hand you a list of foods to fear or sell you a test that cannot deliver what it promises. We do neither. Where the evidence is thin or disputed, we say so on the page itself, not in a footnote at the bottom of it.

A note on safety

This site is for slower, non-emergency food-symptom patterns.

Signs of a severe allergic reaction (anaphylaxis): call emergency services or get to an emergency room immediately. Trouble breathing, swelling of the lips, tongue, throat, or face, a tight feeling in the throat, sudden dizziness, feeling faint, or a sense of collapsing can be signs of anaphylaxis, a life-threatening emergency. Call emergency services immediately or go straight to an emergency room. A doctor's appointment is NOT the right response here.

Nothing here is medical advice.

About this site. intolerance.app is the editorial resource of the team behind GIMETRY. Where we mention the GIMETRY app, we say so plainly. Our content is produced with AI assistance and human review against named medical sources (how we work). GIMETRY is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult a qualified clinician.

What a claim looks like here

Not "studies show". A named source, a date, and a way to tell us we got it wrong.

The leading description of histamine intolerance is an imbalance: more histamine coming in or being produced than your body can break down, often linked to reduced activity of an enzyme called diamine oxidase (DAO), the main enzyme that degrades histamine from food. Maintz & Novak, Am J Clin Nutr 2007 · Last reviewed October 11, 2026

Named source, linked to the claim it supports, not a reference list at the bottom nobody opens.
Review date on every page. Health evidence moves; a date tells you how fresh this is.
Corrections channel. Spot a mistake, email us, we fix it and log it publicly.
What we will not say: "diagnose", "cure", "confirmed". We surface suspects to test, and we say when the evidence is contested.

What matters is how your symptoms behave over weeks, not on any single day.

GIMETRY logs what you eat and how you feel, then compares time windows against each other, so it catches the delayed and cumulative patterns a same-day diary misses. It surfaces foods worth testing, as suspects to bring to your clinician.

See how GIMETRY works Read the method first

GIMETRY is not a medical device and does not diagnose, treat or cure. It narrows the list of things worth investigating.