January 28, 2023

Decode the Symptoms: A Comprehensive Guide to Different Types of Food Allergies

As a senior assistant dietitian with many years of experience, I find food allergies to be prevalent in many populations, but often misunderstood. Food allergies can manifest in different forms, which is why it’s crucial to distinguish between them to prevent any confusion. Some allergies can make you feel quite unwell, while others may cause a severe reaction that could be life-threatening. In this blog, we will be looking at various types of food allergies, their symptoms, and how they can be managed.

Understanding Food Allergies

Food allergies are a result of the body’s immune system overreacting to a particular protein. The immune system perceives the protein as an intruder and produces antibodies to fight it, which is what causes the symptoms. Common food allergens include peanuts, shellfish, soy, wheat, tree nuts, fish, and milk. Symptoms range from mild to severe and can include hives, itching, swelling, digestive issues, or anaphylaxis.

The Different Types of Food Allergies

IgE-Mediated Food Allergies

IgE-mediated food allergies are the most common type of food allergy. This type of allergy occurs when the immune system’s production of IgE antibodies is triggered by a particular protein in food. Upon ingestion of the food allergen, the body releases histamine and other chemicals that cause an allergic reaction. Symptoms may occur immediately or within a few hours after consuming the allergen and usually include hives, itching, swelling, and anaphylaxis.

Non-IgE Mediated Food Allergies

Non-IgE mediated food allergies are different from IgE-mediated allergies as the reaction does not involve the immune system’s production of IgE antibodies. Non-IgE mediated allergies usually have delayed symptoms, and the symptoms are mainly gastrointestinal. This type of allergy may also cause eczema, reflux, and vomiting, and can be triggered by cow’s milk, soy, or egg. Symptoms usually arise 2-24 hours after ingestion of the allergen.

Mixed IgE and Non-IgE Mediated Food Allergies

Mixed IgE and Non-IgE mediated food allergies involve a combination of both IgE and Non-IgE allergen reactions. Symptoms may include hives, swelling, and vomiting associated with IgE-mediated reactions and abdominal pain, constipation, and diarrhea associated with non-IgE mediated reactions.

Symptoms of Food Allergies

Symptoms of food allergies can range from mild to severe and can vary with the type of allergy. Symptoms usually arise shortly after ingestion of the allergen and may include some or all of the following:

  • Hives, itching, and swelling of the face, lips, tongue, or throat
  • Shortness of breath, wheezing, or trouble breathing
  • Vomiting, diarrhea, abdominal pain, nausea, or cramps
  • Anaphylaxis, which is a severe and potentially life-threatening reaction that can happen within seconds of exposure

Diagnosis of Food Allergies

Diagnosis of food allergies may involve a physical examination coupled with laboratory tests such as a skin prick test, a blood test, or an oral food challenge. A food diary can also be used to pinpoint any reactions that occur after eating specific foods.

Treatment of Food Allergies

The most effective way to manage food allergies is to eliminate the allergen from the diet. Antihistamines can also be used to help alleviate mild to moderate symptoms. Severe reactions require immediate treatment with epinephrine, which can be administered through an auto-injector.

Living with Food Allergies

Living with food allergies can be challenging as avoiding allergens can be difficult. It’s essential to communicate with restaurants and caterers to ensure that food is allergen-free when dining out. Check food labels to identify allergens and keep a written plan for an emergency.

Preventing Food Allergies

There is no known cure for food allergies. However, a study has shown that introducing specific allergenic foods early in infancy may decrease the likelihood of developing a food allergy.


In conclusion, understanding the various types of food allergies, their symptoms, and management strategies can prevent confusion and help alleviate symptoms. Living with food allergies can be challenging, but with careful planning, communication, and vigilance, it is possible to live a healthy and fulfilling life.


1. How many people are affected by food allergies?

Food allergies affect roughly 6-8% of children and 2-3% of adults worldwide.

2. Is there a cure for food allergies?

Presently there is no known cure for food allergies, but it can be managed through the elimination of allergens and other interventions to alleviate symptoms.

3. Are food allergies life-long?

Food allergies can persist for life, and it’s crucial to know your triggers and take steps to avoid them.

4. Why do certain foods trigger allergies?

Foods can trigger allergies due to their protein structures, which the immune system perceives as a threat and reacts to accordingly.

5. Can food allergies develop later in life?

Although most food allergies develop early in life, it is possible for them to develop later in life.

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