Could the Food You’re Eating Be Making You Feel Sick? Food Sensitivity & MRT Testing Can Tell You

Bloating after meals you thought were healthy. Headaches that show up for no clear reason. Skin flare-ups, brain fog, joint aches that come and go. If any of this sounds familiar, there’s a real possibility that certain foods are quietly driving your symptoms — and a standard allergy test won’t catch them.

Most people spend years guessing. They cut gluten for a month, then dairy, then try an elimination diet that feels impossible to stick to. They get standard food allergy panels back showing nothing abnormal and walk away with zero answers.

There is a better way. It is called Mediator Release Testing — MRT — and it is one of the most comprehensive food sensitivity tests available today. At Ascend MedSpa in Boise, we offer MRT testing paired with personalized guidance from a Registered Dietitian, so you get real answers and an actual plan.

What Is Mediator Release Testing (MRT)?

MRT is a blood test that measures how your immune system responds to 176 different foods and food chemicals. It was developed through Oxford Biomedical Technologies and is considered the most comprehensive and reproducible blood tests available for identifying diet-driven inflammation.

Here is what makes it different from a basic food allergy panel: traditional allergy tests (IgE tests) only measure one type of immune reaction — the kind that causes immediate, severe responses like hives or throat swelling. But most food sensitivity reactions are not immediate. They are delayed, subtle, and cumulative. MRT measures a broader immune response, specifically the release of chemical mediators like histamine, cytokines, and prostaglandins, which are the substances responsible for inflammation and the symptoms that follow.

Why this matters: Delayed food sensitivity reactions can take up to 72 hours to appear after eating the trigger food. That makes them nearly impossible to trace without testing. MRT removes the guesswork.

How MRT Works: Step by Step

01  Blood Draw	02  Lab Analysis	03  Results Review	04  Your Plan
A routine blood sample is collected and sent to Oxford Biomedical Labs.	Your blood cells are exposed to 176 foods and food chemicals. Mediator release is measured for each one.	A Registered Dietitian walks you through your personalized reactivity report.	You get a structured elimination and reintroduction plan built around your results.

Results are ranked by reactivity level — green (low reactivity), yellow (moderate), and red (high). This gives you a clear, actionable picture of which foods to avoid and which are safe to keep in your diet.

Food Sensitivity vs. Food Allergy vs. Food Intolerance

These three terms are often used interchangeably, but they are not the same thing — and the difference matters when you are trying to find answers.

	Food Allergy (IgE)	Food Sensitivity (what MRT finds)
Reaction timing	Immediate (minutes)	Delayed (hours to days)
Severity	Can be life-threatening	Rarely life-threatening, but chronic
Detectable with standard allergy testing?	Yes	No
Common symptoms	Hives, swelling, anaphylaxis	Bloating, fatigue, headaches, skin issues, joint pain, brain fog

If you have been told your allergy tests are “normal” but you still feel off after eating, food sensitivities are the likely culprit. MRT is specifically designed to detect this type of immune-mediated, delayed inflammatory response.

Symptoms That May Point to Hidden Food Sensitivities

Food sensitivities can affect almost every system in your body. Here are some of the most common signs that your diet may be contributing to chronic symptoms:

Digestive symptoms

•       Bloating or gas after meals, regardless of what you eat

•       Diarrhea or loose stools without an identifiable cause

•       Acid reflux or stomach cramping

•       Irritable bowel syndrome (IBS) that has not responded to treatment

Neurological and cognitive symptoms

•       Brain fog — difficulty concentrating or thinking clearly

•       Frequent headaches or migraines without a clear trigger

•       Mood swings, anxiety, or low energy

Skin and inflammatory symptoms

•       Eczema, rashes, or unexplained breakouts

•       Joint pain or stiffness that comes and goes

•       Chronic low-grade inflammation

•       Sinus congestion unrelated to allergies or illness

Research has linked diet-driven inflammation to conditions including fibromyalgia, migraines, IBS, and inflammatory arthritis. Many patients who follow a diet tailored to their MRT results report significant symptom improvement within weeks.

Who Is a Good Candidate for MRT Testing?

Food sensitivity testing is not just for people with obvious digestive issues. You may benefit from MRT if you:

•       Feel tired or sluggish even when you sleep well

•       Notice symptoms after eating but cannot pinpoint a specific food

•       Have tried elimination diets without lasting improvement

•       Deal with recurring skin issues that do not respond to topical treatments

•       Experience unexplained inflammation or chronic pain

•       Want a science-backed baseline for an anti-inflammatory diet

•       Are working to optimize gut health or overall wellness

MRT testing is particularly valuable if you have already ruled out celiac disease, Crohn’s disease, or other diagnosed gastrointestinal conditions and still do not have answers.

MRT vs. Other Food Sensitivity Tests: Is MRT Worth It?

There is no shortage of at-home food sensitivity tests on the market. Most of them measure IgG antibodies and claim to identify food sensitivities from a finger-prick sample. The problem is that IgG testing is not clinically validated for diagnosing food sensitivities — it measures antibody exposure, not reactivity, and frequently produces false positives.

MRT is different. It measures the actual downstream effect of immune activation — the release of mediators — which is a more accurate proxy for the inflammatory response your body is having to specific foods. It is currently the only test that works this way, and it has been shown in clinical research to have higher reproducibility and clinical correlation than IgG-based panels.

At Ascend MedSpa, we chose MRT specifically because it gives our clients the most actionable data. A result that says “you have high IgG to eggs” tells you very little. A result that says “eggs cause a significant mediator release response in your blood” tells you to remove eggs — and that change tends to produce real, measurable symptom relief.

Food Sensitivity Testing in Boise, ID: What to Expect at Ascend MedSpa

Ascend MedSpa is located at 13900 W. Wainwright Dr., Suite 102 in Boise — conveniently serving Nampa, Meridian, Eagle, and the greater Treasure Valley area.

Here is what the process looks like from your first call to your personalized plan:

1.     You schedule a consultation to discuss your symptoms and health history

2.     A blood draw is completed at a local lab of your choice

3.     Your sample is sent to Oxford Biomedical Labs for analysis

4.     Results are typically returned within 7 to 10 business days

5.     You meet with a Registered Dietitian to review your full reactivity report

6.     You leave with a structured, personalized LEAP (Lifestyle Eating and Performance) protocol

The LEAP protocol is an evidence-based dietary management approach that pairs directly with MRT results. It is designed to reduce inflammation rapidly while gradually reintroducing safe foods in a systematic way — no guesswork, no unnecessary restriction.

Frequently Asked Questions About MRT and Food Sensitivity Testing

How is MRT different from a standard food allergy test?

Standard food allergy tests (IgE panels) detect immediate, potentially severe reactions driven by one part of the immune system. MRT measures a broader immune response — specifically the release of inflammatory chemicals called mediators — which captures the delayed, chronic reactions that standard allergy tests miss entirely. If your allergy tests come back negative but you still feel sick after eating, MRT is the logical next step.

How many foods does MRT test for?

MRT tests your blood against 176 different foods and food chemicals, including common foods like wheat, dairy, eggs, and soy, as well as food additives, colorings, and preservatives. This is significantly broader than most at-home food sensitivity kits, which typically test 50 to 100 items and use a less validated measurement method.

How long does it take to feel results after starting my elimination diet?

Many patients following the LEAP protocol begin noticing symptom improvement within two to four weeks of removing their reactive foods. Results vary depending on the severity of symptoms and how strictly the protocol is followed. Your Registered Dietitian will guide you through the process and adjust your plan as needed.

Does insurance cover MRT food sensitivity testing?

MRT testing is generally not covered by standard health insurance plans. However, some HSA or FSA accounts may cover the cost. We recommend checking with your plan administrator. Contact us directly at Ascend MedSpa for current pricing and any available payment options.

Is food sensitivity testing in Boise available without a doctor’s referral?

Yes. At Ascend MedSpa, you do not need a referral from your primary care physician to schedule MRT testing. You can book directly through our website or by calling our Boise office at 208-999-0382. Our team will walk you through the process from start to finish.