Food intolerance: what symptoms should alert you?
May 18, 2026
Find out how to recognize the symptoms of food intolerance and better understand your body’s reactions. Find out more about the tests offered by PRELEV.
Understanding the signs your body may be trying to send you
Food intolerances affect many people, sometimes without them really knowing it. Persistent fatigue, bloating, digestive discomfort, headaches, inflammation or a feeling of heaviness after meals: many everyday symptoms can be linked to certain foods eaten on a regular basis. However, as these symptoms often appear gradually, or within a few hours of eating, it can be difficult to establish a direct link with food.
In Quebec, more and more people are seeking to better understand the impact of their diet on their overall well-being. Food intolerance testing is therefore attracting growing interest, particularly among people living with digestive discomfort or persistent symptoms with no clear explanation. At PRELEV, we support patients who wish to explore this avenue with analyses tailored to their needs.
Food allergies and food intolerances are often confused, but they don’t work in the same way. A food allergy usually provokes a rapid immune system reaction that can lead to severe symptoms, such as hives, swelling, breathing difficulties or even anaphylactic shock.
Food intolerance, on the other hand, often manifests itself more subtly and gradually. Symptoms may appear hours or even days after eating certain foods. This makes identifying them much more complex. Reactions associated with food hypersensitivities are often linked to digestive discomfort, fatigue or various inflammatory symptoms.
It’s precisely this difficulty in identifying problem foods that prompts many people to consider a food intolerance test to get a better picture of their situation.
Symptoms of food intolerance vary enormously from one person to another. Some people notice mainly digestive discomfort, while others experience more fatigue or more general symptoms.
Bloating after meals is one of the most frequent symptoms. Many patients also describe abdominal pain, gas, episodes of diarrhea or constipation, and a persistent feeling of heaviness in the digestive tract. In some cases, symptoms may be more diffuse, such as migraines, concentration problems, chronic fatigue or a feeling of general inflammation.
Some people also notice skin reactions such as redness, eczema or irritation. Since these symptoms can be associated with a number of other causes, it’s not always easy to think immediately of food hypersensitivity.
It’s not always easy to identify the origin of certain symptoms. Our professionals are available to answer your questions and help you through the process. Contact us for more information on our food intolerance tests.
Unlike a food allergy, which often provokes a rapid and marked reaction, food intolerances can set in gradually. Many people live with symptoms for years without realizing that certain foods may be contributing to their daily discomfort.
Today’s lifestyle can also complicate matters. Fatigue, stress or digestive problems are often trivialized and attributed to the pace of life. As symptoms sometimes appear long after the food concerned has been consumed, it becomes difficult to identify precisely what is triggering the reactions.
Some people also eliminate foods from their diet before undergoing a test, which can influence the results. That’s why it’s so important to be properly accompanied and informed before undergoing any analysis.
PRELEV’s food intolerance tests assess the presence of IgG antibodies associated with various foods. These tests are performed using a simple fingertip blood sample.
The test provides a picture of the diet consumed over the past three months. To ensure representative results, it is important to carry out the test during a period when symptoms are present. If certain suspect foods have been completely withdrawn from the diet for several months, it may be necessary to reintroduce them gradually before sampling, to allow detectable antibodies to form.
However, it’s still very important never to eat foods that have already caused severe reactions, such as breathing difficulties, severe hives or anaphylactic shock.
Although food intolerance tests do not replace a full medical evaluation, they can be an interesting complementary tool for better understanding certain bodily reactions and guiding appropriate dietary changes.
At PRELEV, several profiles are available to suit individual needs and eating habits. The basic profile is an interesting first approach for people wishing to explore certain common food sensitivities.
The full profile enables a more in-depth analysis of a larger number of foods, and is often the preferred option for patients with multiple symptoms or persistent discomfort.
A vegetarian profile is also available to better adapt to the specific eating habits of people who consume little or no animal products.
Choosing the right test can sometimes seem complex. Our professionals are available to answer your questions and help you choose the most appropriate profile.
To make this service even more accessible throughout Quebec, PRELEV now offers the possibility of carrying out your food intolerance test directly at home.
This option is particularly appreciated by people with busy schedules, travel limitations or who live far from a clinic. Sampling can be carried out easily at home, thanks to a kit containing all the equipment needed to perform a simple fingertip sampling.
To obtain your home sampling kit or to receive more information, simply contact our team by e-mail at info@prelev.ca.
Food intolerances can have a major impact on quality of life, even when symptoms initially seem trivial. A better understanding of your body’s reactions can often help identify certain eating habits that contribute to persistent discomfort.
At PRELEV, our team supports you in this process with tests adapted to your reality, offered in our Sherbrooke, Granby and Saint-Hyacinthe clinics, as well as at home.
If you would like more information about our food intolerance profiles, or to schedule an appointment, please contact our team. We look forward to hearing from you.
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Find out how to recognize the symptoms of food intolerance and better understand your body’s reactions. Find out more about the tests offered by PRELEV.
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