Food sensitivity testing is one of the areas where I have to spend the most time managing expectations — in both directions. Some people arrive convinced a test will hand them a definitive list of forbidden foods. Others have read that the tests are meaningless. Neither is right.
What these tests measure
Most panels measure antibody responses to food proteins. That tells you your immune system has encountered and responded to something. It does not, on its own, tell you that the food is causing your symptoms — and this distinction is the single most important thing to understand before you spend money on one.
A true food allergy is a different, faster and more dangerous mechanism, diagnosed differently, and it is not what these panels are for. If you have ever had a reaction involving your breathing, that is an allergist conversation, not this one.
Why I still order them
- They narrow the field. An elimination diet with a shortlist is far more likely to be completed than one that starts from everything.
- They sometimes flag a food someone eats daily and had never thought to question.
- Read alongside gut findings, a broad pattern of reactivity can say more about barrier function than about any individual food.
How I read a result
A flagged food is a hypothesis, not a sentence. The test is one input; your own history is another, and often the better one. If a panel flags something you eat happily every week with no symptoms, that is worth a raised eyebrow rather than an immediate ban. If it flags something you had already privately suspected, that is a much stronger signal.
The other thing I watch for is a result where nearly everything is flagged. That is usually telling me something about the gut barrier rather than handing me a list of twenty foods to remove — and removing twenty foods from someone who is already tired and struggling is rarely the right move.
The risk nobody mentions
Over-restriction is a real harm. Every food removed narrows the diet, and a narrow diet is itself a problem — nutritionally and socially. My aim is always the shortest possible removal for the shortest sensible period, followed by structured reintroduction. The goal is a wider diet at the end than at the start, not a narrower one.
None of this is a substitute for a conversation with a practitioner who knows your history. If something here sounds like you, book a free 15-minute call and we will talk it through properly.