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Food Sensitivity vs. Allergy vs. Intolerance

For each person who comes into my office, I ask myself: are your symptoms related to what you’re eating? It’s a simple question, but it’s actually quite challenging to determine. This article is going to focus on a common question I get asked: What’s the difference between a food sensitivity, allergy, and intolerance?

Note* in order to assess if your symptoms are related to what you’re eating, there are many factors at play like: what you’re NOT eating (ie. key nutrients), how much you’re eating, combination of what you’re eating, when you’re eating, the state of your nervous system when you’re eating, health of your microbiome, underlying medical conditions, medication or supplement side effects, etc. It’s not always just a food reaction.

Having an adverse reaction to food goes so much beyond experiencing unpleasant digestive symptoms. Think of eating fast food. There’s immense pleasure and satisfaction in the moment when you eat it, but how energetic do you feel after? I know I feel pretty sluggish and lazy afterwards.

Symptoms of Adverse Food Reactions

Heart burn or Reflux

Burping/Belching after a Meal

Feeling like food is ‘stuck’ in upper abdomen

Nausea or feeling unwell



Bowel Issues – constipation, diarrhea, urgency, floating stools, presence of mucous, etc.


Brain Fog

Migraines or Chronic Headaches

Joint Pain

Eczema/Skin Reactions

Weight gain

Mood Changes

Food Allergy vs. Food Sensitivity vs. Intolerance

Food allergies and sensitivities= your immune system over-reacting to food you’re eating. The protein component (antigen) in a particular food is seen as a foreign invader, so our immune system produces antibodies to neutralize and deal with it.

A food allergy is when this immune reaction happens immediately- within seconds to minutes after ingestion. IgE antibodies are produced, leading to histamine release and you get the classic symptoms of swelling, sneezing, rashes, and possibly, anaphylaxis. This can be more serious and these allergies are generally discovered earlier in life. Allergists do IgE food allergy testing.

A food sensitivity is a delayed immune reaction – hours to days after ingestion. A different antibody is produced – IgG antibodies, and these form little complexes with the protein (antigen) that can deposit in tissue and cause digestive symptoms or more subtle ones like migraines, fatigue, and weight gain. You can do a blood test for food sensitivity testing, where your blood is exposed to different food antigens and the antibody response is measured. This is something I do