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LEAP stands for Lifestyle, Eating, And Performance — a personalized elimination diet built from your MRT (Mediator Release Test) blood results, rather than a generic list of “commonly reactive” foods. MRT measures how your white blood cells respond to roughly 170 foods and food chemicals, so your elimination plan is based on your own biology, not a population average.
If you’ve searched “what is LEAP” or “MRT test” while trying to figure out why standard elimination diets haven’t fully resolved your symptoms, you’re not alone — food sensitivity testing gets recommended constantly, but rarely explained clearly. Here’s what LEAP actually stands for, how MRT testing works, and what I’ve consistently seen in my own clinical practice.
Table of Contents
What Does LEAP Stand For?
LEAP stands for Lifestyle, Eating, And Performance. It’s a patented, phased elimination diet developed by Oxford Biomedical Technologies to work specifically with results from the MRT (Mediator Release Test). Unlike generic elimination diets that remove a predetermined list of common allergens, LEAP is built entirely around your individual test results — the foods you eliminate are the ones your own blood work identifies as reactive, not a standardized list.
What Is the MRT Test?
The Mediator Release Test (MRT) is a blood test that measures how your white blood cells respond to roughly 170 foods and food chemicals. When your immune system reacts to a food, it releases inflammatory mediators — histamine, cytokines, prostaglandins, and others — from those cells. MRT quantifies that release directly, which is what sets it apart from IgG antibody panels: it measures the actual inflammatory event rather than the presence of an antibody that may or may not correlate with symptoms.
MRT results aren’t a simple three-color “safe list” — each food gets a numeric reactivity score, and anything scoring 1.6 or higher is flagged reactive and removed during the initial elimination phase. A lower score doesn’t automatically mean a food is risk-free forever; it means it’s a reasonable starting point while your system calms down. Because MRT captures reactions regardless of which immune pathway is involved, it can pick up non-IgE mediated sensitivities that standard allergy testing misses entirely — including reactions to food chemicals and additives, not just whole foods.
MRT does not screen for IgE-mediated food allergies or celiac disease. If you haven’t already been evaluated for true food allergies (the kind that can cause hives, swelling, or anaphylaxis) or celiac disease, those need to happen separately — with an allergist and through celiac blood testing/biopsy, respectively — before or alongside MRT testing. MRT is designed to identify delayed, non-IgE food sensitivities, not replace allergy or celiac testing.
How MRT Testing for Food Sensitivities Works
Blood draw. A sample is sent to the lab and tested against the full MRT panel.
Results come back as a numeric reactivity score for each food. Anything scoring 1.6 or higher is considered reactive and is removed for the initial elimination phase.
A Certified LEAP Therapist interprets the results. This step matters — the test alone doesn’t produce outcomes. The personalized protocol built from your results is what creates symptom improvement.
You begin the LEAP method eliminating your reactive foods for the initial 11-day phase. From there, reintroduction is a known, controlled process — you add back one new food per day as long as you’re tracking symptoms, since a delayed reaction can take up to 72 hours to show up.
The LEAP Method: How the Elimination Protocol Works
The LEAP method starts with an 11-day elimination phase, removing every food that scored 1.6 or higher on your MRT panel. This is the phase where most people notice the fastest changes. From there, reintroduction follows a known process: one new food added back per day, as long as you’re tracking symptoms, since a reaction can take up to 72 hours to show up.
This is the core difference between LEAP and most elimination diets: instead of removing foods based on population-level assumptions about what’s “commonly reactive,” you’re removing the specific foods your own immune system has flagged.
MRT/LEAP vs. Low FODMAP: How They’re Different
Low FODMAP is the other elimination approach people often land on for gut symptoms, so it’s worth clarifying how it differs.
| Low FODMAP | MRT/LEAP | |
|---|---|---|
| How it targets triggers | By carbohydrate category | By individual blood test result |
| Best fit for | Classic IBS-pattern bloating & irregularity | Symptoms extending beyond digestion (migraines, joint pain, skin, fatigue) |
| Research base | Strong, independent RCT support | Smaller, mostly pilot studies & case series |
| Starting point | Trial elimination, then reintroduction | Blood test result guides elimination from day one |
Low FODMAP is generally positioned as the more conservative first step for classic IBS-pattern symptoms, and it has more independent research behind it. But in my own practice, I regularly see clients who tried low FODMAP with only marginal improvement go on to fully resolve their symptoms once we identify their actual reactive foods through MRT — because FODMAP restriction only ever addresses one type of trigger (fermentable carbohydrates), and misses food chemicals, additives, and specific proteins entirely.
My own opinion, for what it’s worth: I think low FODMAP rests on a somewhat narrow premise — that carbohydrate fermentation is the primary driver of symptoms — and it doesn’t hold for everyone. It didn’t for me personally; my own symptoms got worse on low FODMAP, not better, before MRT identified what was actually going on.
What the Research Shows
MRT/LEAP’s evidence base is smaller than low FODMAP’s and largely comes from pilot studies and clinical case series rather than large independent RCTs — worth naming directly, since much of the published research originates from or is funded by the test’s manufacturer. That said, the existing studies are consistently positive: a diarrhea-predominant IBS pilot found average symptom scores dropped by more than half after at least one month on the LEAP method, and small studies in PCOS, migraine, and fibromyalgia populations have reported similar quality-of-life improvements. MRT’s reported test characteristics are frequently cited as roughly 94.5% sensitivity and 91.7% specificity, though independent, large-scale replication of these figures outside company-affiliated publications remains limited.
MRT/LEAP vs. IgG Testing vs. Traditional Elimination Diets
MRT/LEAP often gets lumped together with IgG food sensitivity testing and generic elimination diets, but the three work on very different premises.
IgG testing measures antibody levels against foods, but major allergy bodies — including the AAAAI, ACAAI, EAACI, and CSACI — have all published position statements against using it to diagnose food sensitivity. Their concern: elevated IgG typically reflects normal immune exposure and tolerance to a food you eat regularly, not an adverse reaction to it. That’s a fundamentally different mechanism than MRT, which measures the actual release of inflammatory mediators from white blood cells rather than antibody presence — this is the core reason MRT and IgG testing shouldn’t be treated as interchangeable, despite both being blood-based “food sensitivity” tests.
Traditional elimination diets (removing a fixed list of common allergens like gluten, dairy, soy, corn, and eggs, or following a generic protocol like Whole30) work on a trial-and-error basis, with no testing involved at all. They can be effective, but they eliminate foods based on population-level assumptions about what’s commonly reactive rather than data on what’s reactive for you specifically — which means you may be restricting foods unnecessarily while still reacting to ones the generic list doesn’t cover.
| MRT/LEAP | IgG Testing | Traditional Elimination Diets | |
|---|---|---|---|
| What it measures | Inflammatory mediator release from white blood cells | Antibody presence (often reflects tolerance, not reactivity) | Nothing — foods removed by assumption, not testing |
| Individualized? | Yes — based on your own results | Yes, but clinical validity is disputed | No — same list for everyone |
| Major allergy body support | Not formally endorsed by AAAAI, but distinct mechanism from IgG | Not recommended by AAAAI, ACAAI, EAACI, or CSACI | Not a testing method, so not applicable |
| Risk of unnecessary restriction | Lower — elimination guided by your specific results | Higher — frequent false positives from normal exposure | Higher — may remove foods you don’t react to while missing ones you do |
What I See Clinically
Beyond the published research, here’s what I consistently observe running MRT/LEAP with my own clients:
Every client I’ve worked with who came in with migraines has seen improvement — several have had complete resolution.
Two recent clients with POTS syndrome symptoms have seen measurable improvement following their personalized LEAP protocol.
Reduced bloating has been a universal finding — every client I’ve guided through MRT/LEAP has reported improvement here.
Clients seeking weight reduction have seen it, alongside consistent improvements in energy and physical performance.
Skin issues can and do improve, though skin and hair changes tend to show up on a longer timeline — closer to 6 months of staying on a personalized protocol.
I’ve seen improvements in mood and sleep quality, along with reduced allergy symptoms — myself included, my own seasonal allergies resolved entirely once my reactive foods were identified.
Beyond bloating, clients have seen improvement in a range of other gut symptoms — including irregularity, reflux, and general digestive discomfort — alongside gains in physical performance.
These are clinical observations from my own practice, not a controlled study — individual results vary, and MRT/LEAP is most effective when guided by a Certified LEAP Therapist.
“My own MRT results changed how I understood my body. My vestibular migraines are gone. What I spent years assuming were seasonal allergies turned out to be food-driven inflammation — I don’t suffer from allergy symptoms at all anymore. I documented my full results, including a 96% reduction in total symptom severity, in my own published case study.”
Who Is a Good Candidate for MRT Testing?
- You’ve tried elimination diets without lasting relief. If you’ve already cut common allergens or done a low FODMAP trial and still have symptoms, MRT can identify triggers those approaches wouldn’t catch.
- Your symptoms extend beyond digestion. Migraines, joint pain, fatigue, brain fog, and skin flares alongside gut symptoms point toward a systemic inflammatory pattern MRT is designed to catch.
- You want a data-driven starting point. Rather than trial-and-error elimination, MRT gives you a personalized reactivity map before you remove a single food.
- You’re willing to work with a Certified LEAP Therapist. MRT testing alone doesn’t produce results — the interpretation and personalized protocol that follows is what makes it effective.
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Frequently Asked Questions
LEAP is a patented, phased elimination diet designed to work with your individual MRT (Mediator Release Test) results, rather than a standardized list of commonly reactive foods.
LEAP stands for Lifestyle, Eating, And Performance.
The MRT (Mediator Release Test) is a blood test that measures how your white blood cells respond to roughly 170 foods and food chemicals, identifying which ones trigger an inflammatory mediator release in your body.
MRT measures the actual release of inflammatory mediators from white blood cells, regardless of which immune pathway triggered it, while IgG panels only measure antibody presence — which doesn’t always correlate with symptoms.
Neither is universally better — low FODMAP has stronger independent research support for classic IBS-pattern bloating and irregularity, while MRT/LEAP is more useful when symptoms extend beyond the gut or when low FODMAP alone hasn’t resolved symptoms.
Foods scoring 1.6 or higher on the MRT panel’s reactivity scale are considered reactive and are eliminated during the initial 11-day phase of the LEAP method.
No. MRT measures the actual release of inflammatory mediators from white blood cells, while IgG testing measures antibody levels — which major allergy organizations including the AAAAI, ACAAI, EAACI, and CSACI have stated typically reflect normal food exposure and tolerance rather than a reaction.
