What Causes Food Allergies?

If you’re one of the millions of people who suffer from food allergies, you know how difficult it can be to find information on the subject. This blog post will explore what causes food allergies and how to best avoid them.

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A food allergy is when your body has a specific and immediate reaction to a certain food. Your immune system overreacts to a protein in the food as if it were harmful, even though it’s not. When this happens, your body releases chemicals, such as histamine, which can cause symptoms such as hives, wheezing, and swelling of the lips, eyes, and throat.

It’s important to know that not all reactions to food are allergies. Some reactions are caused by intolerances, such as lactose intolerance, or sensitivities to chemicals or other substances in foods. Food intolerances generally cause less serious symptoms than allergies, and they often develop more slowly. IgE-mediated or immediate onset food allergies involve the immune system and can cause severe reactions, even death.

What are food allergies?

Food allergies are immune system reactions to substances in foods. They can cause a range of symptoms, from mild (hives, itching, and swelling of the lips) to severe (trouble breathing, wheezing, and loss of consciousness). Some people with food allergies have only one or two allergies, while others may be allergic to many different foods.

There is no cure for food allergies, and the only way to prevent an allergic reaction is to avoid eating the foods that you are allergic to.

What causes food allergies?

There is no one answer to this question as there are many possible causes of food allergies. Allergies can be caused by a variety of factors, including genetics, the environment, and the immune system.

Some people may be born with a predisposition to developing allergies, as certain genes have been linked to an increased risk of allergic reactions. Additionally, exposure to certain environmental factors, such as dust or animal dander, can also lead to the development of allergies.

The immune system is responsible for protecting the body against harmful substances, but in some cases, it can overreact to harmless substances, such as food proteins. When this happens, the body produces immunoglobulin E (IgE) antibodies to the substance. These antibodies trigger cells in the body to release histamine and other chemicals that cause an allergic reaction.

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The immune system and food allergies

The immune system is responsible for protecting our bodies from harmful substances, such as bacteria and viruses. When the immune system encounters an allergen (a substance that triggers an allergic reaction), it produces antibodies to destroy the allergen. In people with food allergies, the immune system mistakenly treats a harmless food protein as if it were harmful, producing antibodies to destroy it. The next time that person eats even a small amount of the same food, these antibodies can cause symptoms such as wheezing, difficulty breathing, hives, stomach cramps, diarrhea, or lightheadedness.

Allergy testing

If you’re concerned that you or your child may have a food allergy, the first step is to see an allergist. This is a doctor who specializes in diagnosing and treating allergies.

The allergist will ask about your family history of allergies and about any symptoms you or your child has had. He or she will also do a physical exam.

The next step is usually allergy testing. This can be done with a skin test or a blood test. A skin test is usually done first. It is quick, inexpensive, and relatively painless. A tiny amount of the suspected allergen is placed on the skin, usually on the forearm. The skin is then pricked with a needle so that the allergen goes under the skin surface. If you are allergic to the substance, you will develop a raised, itchy bump within 15 minutes.

A blood test for food allergies is also available, but it is more expensive than a skin test and not as accurate. This test measures the level of antibodies in the blood that are produced in response to an allergen.

If the results of either the skin or blood tests are positive, it does not necessarily mean that you are allergic to that food. It only means that you may be allergic and further testing is needed to be sure.

If you have had a severe reaction to a food (anaphylaxis), your allergist may do tests even if the skin and blood tests are negative because these tests are not always accurate in people who have had severe reactions

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Managing food allergies

The most important thing you can do to manage your food allergies is to avoid the foods that trigger your allergies. This can be a challenge, as even trace amounts of your allergens can cause a reaction. In some cases, such as with peanut allergies, even coming into contact with allergens can trigger a reaction.

To avoid your triggers, you need to become a label reader and learn to recognize the ingredients that contain your allergens. You should also avoid foods that have been prepared in areas where your allergens are present, as cross-contamination can occur. When in doubt, always ask about the ingredients and preparation of food before eating it.

In addition to avoiding your triggers, you may also need to take steps to treat your symptoms if you do have a reaction. This may include carrying an epinephrine auto-injector and being trained in how to use it properly. You should also wear medical alert jewelry and carry a card that lists your allergies in case of an emergency.

Living with food allergies

It’s estimated that 32 million Americans have food allergies — that’s about 1 in 10 people. For many, living with food allergies is a daily challenge. Some people have mild reactions, while others have reactions that are so severe they can be life-threatening.

There are many different types of food allergies, but the most common are allergies to eggs, milk, peanuts, tree nuts, soy, wheat, fish, and shellfish. These foods account for 90% of all food-allergic reactions.

Most food allergies are caused by proteins in the food that the body perceives as harmful. When these proteins come into contact with the body, it triggers an immune system response. The immune system releases chemicals, such as histamine, which cause the symptoms of an allergic reaction.

Symptoms of a food allergy can range from mild to severe and can include:
-Swelling of the lips or tongue
-Wheezing or difficulty breathing
-Nausea or vomiting
-Anaphylaxis (a severe and potentially life-threatening reaction)

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If you think you may have a food allergy, it’s important to see a doctor so that you can get a diagnosis and treatment plan.

The future of food allergies

Experts are not sure why the number of people with food allergies has increased over the past few decades, but some think that it may be because we are now better at recognising and diagnosing them. We also have a more globalised diet and so we are exposed to a wider variety of foods than ever before.

There is currently no cure for food allergies, but there are treatments available that can help to ease the symptoms. If you suspect that you or your child has a food allergy, it is important to see a doctor so that they can confirm the diagnosis and develop a treatment plan.


What are food allergies?
A food allergy is when your body has a bad reaction to a certain food. This can happen when you eat the food, breathe in particles of it, or touch it. A food allergy can cause a range of symptoms from mild (such as a rash) to severe (anaphylaxis).

What are the most common foods that people have allergies to?
The most common foods that people have allergies to are:
-tree nuts
-shellfish (Source: https://www.aaaai.org/conditions-and-treatments/library/at-a-glance/food-allergy)
However, people can be allergic to any food, including fruits, vegetables, and spices.


There are many resources available to help you understand and manage food allergies. Here are some of the most useful:

The Food Allergy & Anaphylaxis Network (FAAN) is a non-profit organization that provides education, advocacy, and research for those affected by food allergies.

The National Institute of Allergy and Infectious Diseases (NIAID) is part of the National Institutes of Health (NIH). NIAID conducts and supports basic and applied research to better understand, treat, and ultimately prevent infectious, immunologic, and allergic diseases.

The Centers for Disease Control and Prevention (CDC) is the national public health institute of the United States. The CDC provides information on food allergies, as well as other allergens such as pollen, pet dander, mold, and dust mites.

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