What are food allergies?

Food allergies are an exaggerated reaction of the immune system to certain food components that are usually harmless to the human body. These reactions occur when the immune system mistakenly identifies these substances as a threat, causing an allergic reaction. This happens because the immune system develops specific antibodies that react to allergens, thus causing various symptoms to appear. Food allergies are different from food intolerances, which do not involve the immune system and are more commonly associated with digestive disorders such as lactose intolerance.

Food allergies are based on the production of immunoglobulin E (IgE) antibodies, which bind to the allergen and activate chemicals such as histamine that cause symptoms. Histamine is a substance released from mast cells and basophils, causing an inflammatory response that can manifest as itching, swelling, or even anaphylaxis. The reasons for the development of food allergy can be genetic, related to environmental factors or early exposure to allergens. Many food allergies develop in early childhood, but some may disappear with age. However, some types of allergies, such as peanut and seafood allergies, can last a lifetime.

The most common allergens

Some foods are more likely to cause allergies than others. These include:

• Peanuts and other nuts
• Dairy products
• Seafood and fish
• Olas
• Soy and wheat

Peanuts and nuts

Allergies to peanuts and other nuts are among the most common and severe food allergies. They can cause severe anaphylactic reactions that require immediate medical attention. Anaphylaxis is an acute and life-threatening immune reaction that can develop very quickly and requires an immediate injection of epinephrine. Management of these allergies usually involves avoiding peanuts and tree nuts altogether, and patients are often advised to carry an epinephrine auto-injector as a preventative measure.

Dairy products

Dairy allergy is common in children, but it may disappear with age. This is different from lactose intolerance, which is an enzyme deficiency and does not involve the immune system. Management of milk allergy symptoms involves avoiding milk and its derivatives. Symptoms of a milk allergy can include hives, vomiting, stomach upset, and even anaphylaxis. Older children and adults should be especially careful when choosing foods and consider alternatives such as soy or almond milk.

Seafood and fish

Allergies to seafood and fish are common in adults and can appear at any age. These allergies are often lifelong and their symptoms can be very severe, including anaphylaxis. Seafood allergies can often be related to tropomyosin, which is the main allergen. Because seafood is an important source of protein, people with such allergies must find other dietary sources to ensure adequate nutrient intake.

Symptoms and diagnostics

Symptoms of food allergies can be different and vary depending on the age of the person and the severity of the reaction. Symptoms usually appear within a few minutes to two hours after ingesting the allergen.

Variety of symptoms

Symptoms can vary from mild to severe and may include skin rash, hives, itching, swelling of the lips, tongue or throat, shortness of breath, stomach upset, diarrhea, vomiting and, in more severe cases, anaphylaxis. In children, symptoms are often related to digestive disorders and skin rashes, but in adults, respiratory symptoms are more common. The severity of reactions can change each time a person is exposed to an allergen and can be unpredictable.

Anaphylaxis

Anaphylaxis is a life-threatening systemic reaction that requires immediate medical intervention. Its symptoms include a fast heartbeat, low blood pressure, trouble breathing, and loss of consciousness. First aid includes an injection of epinephrine, followed by immediate medical attention. Epinephrine works by rapidly constricting blood vessels and relaxing muscles in the airways, thereby improving breathing and stabilizing blood pressure.

Diagnostic methods

Food allergy diagnosis is done using several methods, including skin tests, which involve applying small amounts of allergens to the skin and observing for reactions. Blood tests can detect the presence of IgE antibodies, which indicate an allergy. In some cases, elimination diets and food challenge tests may also be performed to identify specific allergens. Food provocation tests should only be performed in a medical facility where emergency care is available, as they can cause severe reactions.

Allergy management and treatment

Dietary changes

Dietary adjustments are essential in allergy management. This means avoiding foods that cause allergic reactions. A nutritionist can help you develop a balanced diet that eliminates allergens but provides all the nutrients you need. This is especially important for children to ensure their optimal growth and development. Parents are often taught to read food labels and recognize hidden allergens.

Immunotherapy

Immunotherapy, which involves gradually increasing doses of allergens, is already being used and studied for some allergies, such as peanut allergy. It can help reduce sensitivity to specific allergens and improve quality of life for patients. This therapy requires close monitoring and may last several years, but it is a step forward in reducing the risk of a severe allergic reaction.

Impact of food allergies on quality of life

Food allergies can have a significant impact on daily life, limiting dietary options and causing concern about accidental allergen ingestion. This can lead to social isolation, as patients may avoid public meals or restaurants for fear of unknown allergens. Such constant vigilance can lead to psychological tension and anxiety.

Children with food allergies may struggle in the school environment, especially if there is insufficient understanding or support from staff and peers. Parents often need to be actively involved in providing a safe environment for their children. Psychological support resources, such as counseling and support groups, can help families cope with the challenges of allergies. It is important for children to feel safe and accepted in their environment and schools need to create a supportive environment.

Prevention and education

Early intervention and education are critical factors in the prevention and management of food allergies. Proper information to the public and patients can reduce risk and improve quality of life.

Early intervention

Research shows that gradually introducing allergens into a child's diet can reduce the risk of developing allergies. For example, including peanuts in the diet in early childhood can reduce the development of peanut allergy. The use of this strategy requires careful medical supervision, especially in children at high risk of allergies. It is recommended to consult a pediatrician about how and when to perform such administration. Early intervention can be critical in preventing severe allergies later in life.

Public education

Educating the public about food allergies can reduce common myths and promote better understanding of allergy perception. Educational activities in schools, workplaces and community settings can improve safety and support for people with food allergies. Spreading information about first aid for anaphylaxis can be lifesaving in the event of an emergency.

Future research and innovation

There are promising research and innovations in the field of food allergies that could change the management of these diseases in the future. Immunotherapy is already being used, but further research into gene therapy and the influence of the microbiome on allergies offers new possibilities. These studies could help develop even more effective treatments and prevention strategies.

A deeper study of the genetic and environmental factors of food allergies could provide a new understanding of the causes of these diseases and help develop personalized treatment options. Innovations such as rapid diagnostic tests and improved epinephrine delivery systems could improve patient safety and quality of life.

Research progress may lead to the development of new therapies that could help reduce the severity of allergies or even prevent them from occurring. This development could be particularly important for children who suffer from severe allergies, providing them with a better quality of life and fewer restrictions in their daily life.