Food Sensitivity Testing: Unlocking hidden food allergies & Unexplained Symptoms

by | Sep 1, 2025 | Blog, Rehabilitation

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PHOTO BLOOD TEST
PHOTO SEVERE ECZEMA

A growing trend in Diet & Nutrition health, is discovering your specific food sensitivities, or IgG type delayed food allergies.

The normal food allergy (which can be discovered by skin scratch test) is an IgE (immediate) type allergy & inflammatory reaction. We know the immune system can also create delayed allergies, or “sensitivities” to foods by creating IgG antibodies to foods & allergens. There is a growing body of evidence to support the clinical benefits of eliminating IgG reactive foods from the diet. Dr. Collings, ND offers this different type of allergy blood test if you are interested in determining any food sensitivities you may have. The tricky part in determining IgG food sensitivities is that they are delayed antibodies that take about 4 weeks to ramp up and cause inflammation (so how you feel today might be due to what you ate last month).

Blood sample tubes on lab report for IgG food sensitivity testing

PHOTO BLOOD TEST 

In an IgG reaction, the IgG antibodies bind to food antigens creating antibody-antigen complexes. If antibody complexes are present in large numbers and the reactive food is still being eaten, the body can’t remove them quickly enough. The food antigen-antibody complexes accumulate and can be deposited in body tissues. Once in tissues, these complexes can trigger inflammation, which may be responsible for a wide variety of inflammatory symptoms and pain.

Most patients with food sensitivities experience IBS, and these hidden triggers can explain most of your digestive symptoms. For other patients, these antibody complexes can cause inflammation elsewhere in the body leading to symptoms like Joint Pain, Headaches, Fatigue & more. Inflammatory skin conditions like Eczema & Psoriasis can also be triggered by food sensitivities and these patients find tremendous benefit following a diet based on their blood results.

Severe eczema rash on forearms with red, inflamed patches

PHOTO SEVERE ECZEMA

The test itself is a very simple blood draw (via Lifelabs), and is performed by a specialized lab called Rocky Mountain Analytical. Below is a photo of what the report looks like, and much more information can be found on their website:

https://rmalab.com/test/rma-fst-igg-food-sensitivity-test

IgG food sensitivity test report

You can try guessing which one of a hundred different diets out there will help you… … Or, if you are ready to use a scientific lab approach to discovering the perfect diet for you, then come in to get this unique test for YOUR unique immune & digestive system. 

FAQs

  • What is food sensitivity testing?
    Food sensitivity testing identifies specific food sensitivities or IgG type delayed food allergies that may cause unexplained symptoms.
  • How does food sensitivity testing differ from traditional allergy testing?
    Unlike traditional tests that focus on IgE immediate reactions, food sensitivity testing examines IgG delayed reactions to foods.
  • What symptoms can food sensitivities trigger?
    Food sensitivities can lead to various symptoms including IBS, joint pain, headaches, fatigue, and inflammatory skin conditions like eczema.
  • How is the food sensitivity test conducted?
    The test involves a simple blood draw, analyzed by a specialized lab to detect IgG antibodies against specific foods.
  • Why should I consider food sensitivity testing?
    Food sensitivity testing can uncover hidden dietary triggers, helping you create a personalized diet to alleviate unexplained symptoms.

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At South Simcoe Physiotherapy, each client is treated independently by a registered physiotherapist, no assistants or aides are used.  All of our therapists are registered physiotherapists and are members of the Canadian Physiotherapy Association.  Each therapist strives to stay current on breaking techniques, constantly upgrading their skills.
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