Is it an Allergy, Intolerance, or Sensitivity?

You’ve probably heard someone mention recent changes to their diet, inspired by a book, a TV show, or perhaps advice from a healthcare professional like a naturopathic doctor or nutritionist. With more awareness around food-related health issues, many people in Toronto have experienced symptoms of food allergies or sensitivities. It’s common to experiment by eliminating certain foods, especially if you’re dealing with any of the following concerns:

  • Digestive disorders
  • Skin rashes or disorders
  • Mood fluctuations
  • Chronic joint pain
  • Fatigue
  • Weight gain or difficulty losing weight
  • Migraines
  • Difficulty concentrating and focusing

While experimenting with dietary changes can be a good starting point, a more comprehensive approach is often necessary to truly understand how what we eat, drink, and breathe can impact our health. That’s where advanced food sensitivity testing in Toronto and consultations with a functional medicine doctor in Toronto can make a significant difference.

Breaking Down Food Reactions

Understanding the differences between food allergies, sensitivities, and intolerances is crucial for effective treatment and lifestyle adjustments. Here’s a closer look:

What is a Food Allergy?

A food allergy is a condition where the immune system mistakenly identifies a food ingredient as harmful, triggering an immune response. In these cases, the body produces IgE antibodies, which can lead to a rapid and severe reaction affecting multiple organs. Symptoms can range from mild, like nausea or hives, to life-threatening, such as anaphylaxis, which involves difficulty breathing and dangerously low blood pressure.

Food allergies affect about 4% of adults and 5% of children, and they can be genetic. Even trace amounts of the offending food can cause a severe reaction, so avoiding it entirely is essential. Proper diagnosis of a food allergy involves an IgE blood test or a skin prick test conducted by a primary healthcare provider.

What is a Food Sensitivity?

Food sensitivities are much more common than true allergies and often get mistaken for them. Unlike allergies, food sensitivities involve the immune system’s delayed response, producing IgG, IgA, and IgM antibodies. These reactions are more subtle and can take anywhere from an hour to three weeks to manifest symptoms, which include digestive discomfort, headaches, and skin issues.

Food sensitivities can be accurately identified through blood tests, which provide a detailed look at how your body reacts to specific foods. Food sensitivity testing in Toronto can help pinpoint which foods may be triggering inflammation and affecting your health.

What is a Food Intolerance?

Food intolerances are different from allergies and sensitivities because they don’t involve the immune system—there are no antibodies produced. Instead, intolerances occur when your body struggles to digest a certain ingredient, often causing gastrointestinal symptoms like gas, bloating, stomach pain, heartburn, and diarrhea.

Lactose intolerance is a common example, affecting about 10% of North Americans. While small amounts of the problematic food may be tolerable, consuming too much can lead to discomfort. Simple interventions, like switching to lactose-free milk or taking lactase enzyme supplements, can help manage symptoms.

How to Navigate Food Reactions Effectively

If you’re dealing with unexplained symptoms, it’s vital to get to the root of the problem. At The Dempster Clinic – Center for Functional Medicine, we utilize advanced diagnostic tools such as food sensitivity testing, microbiome testing, and hormone testing in Toronto to provide a comprehensive understanding of your unique health profile. Identifying the triggers causing your symptoms allows us to craft personalized dietary and lifestyle recommendations that genuinely support your well-being.

Why Testing Matters

Self-diagnosing food-related health issues can only get you so far. Without accurate testing, you may overlook key factors impacting your health, like hidden food sensitivities or imbalances in your gut microbiome. Advanced testing can help differentiate between an allergy, sensitivity, or intolerance, allowing for more targeted and effective treatment.

For example:

  • Food Sensitivity Testing: Identifies delayed immune responses to specific foods.
  • Microbiome Testing in Toronto: Assesses the balance of bacteria in your gut, which plays a crucial role in digestion, immunity, and inflammation.
  • Heavy Metal Testing in Toronto: Determines if toxic metals are contributing to your symptoms, as heavy metals can exacerbate inflammatory responses.
  • Hormone Testing in Toronto: Reveals if hormonal imbalances are affecting your digestion and overall health.

By working with one of the best functional medicine doctors in Toronto, you can get a clearer picture of your health and receive a plan that is customized to your needs.



If you’re experiencing symptoms related to food allergies, sensitivities, or intolerances in Toronto, don’t wait to take action. Contact The Dempster Clinic – Center for Functional Medicine to learn more about our advanced diagnostic tests and holistic treatment options.

Ready to get started? Schedule your Complimentary 15-Minute Discovery Call with me, and explore how personalized functional medicine can help you achieve better health and vitality.

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John Dempster Naturopathic Doctor
Dr. John Dempster, ND is a board certified Naturopathic Doctor and the Founder and of The Dempster Clinic –Center for Functional Medicine. Dr. Dempster, ND focuses on a Functional Medicine model when treating patients who suffer from various conditions such as mental illness, autoimmune disease, digestive disorders, and more. In addition, Dr. Dempster, ND has a strong passion for helping patients embrace an optimal aging philosophy, where he supports them in achieving a longer, healthier, and more fulfilling life. By referring to functional medicine testing, his approach emphasizes the importance of optimizing biochemical, metabolic, and hormonal functions within the body.

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