A food allergy is an immune response to certain proteins found in foods consumed. Unlike food intolerance, which is usually caused by enzyme deficiencies and does not involve the immune system, a food allergy can cause serious and potentially life-threatening reactions such as anaphylaxis. In a food allergy, the immune system mistakenly identifies proteins in food as dangerous, which causes immune cells to activate and release histamine and other inflammatory mediators. Symptoms can range from rashes and itching to more severe symptoms such as swelling of the airways and anaphylactic shock.
History of the disease and interesting historical facts
Food allergies have been known to mankind since ancient times. The first mentions of food allergies can be found in the works of Hippocrates and other ancient thinkers, describing reactions to certain products. However, systematic study of food allergies began only in the 20th century. Interestingly, at the beginning of the 20th century, it was believed that only rare products could cause allergies, while modern medicine recognizes more than 170 different food allergens. In the 1980s, scientists made a significant breakthrough in understanding the mechanisms of allergic reactions, which led to the development of modern diagnostic and treatment methods. In 1997, with the development of molecular biology, key allergen proteins were identified, which made it possible to create various tests for diagnosing food allergies.
Epidemiology
The epidemiology of food allergy has shown alarming trends in recent decades. According to the World Health Organization (WHO), in developed countries, about 5-7% children and 1-2% adults suffer from food allergies. Analysis shows that the prevalence of food allergy has increased by 50% over the past 30 years. There are significant differences in the frequency of food allergy in different regions, which may be due to genetic factors, lifestyle and environment. For example, countries with poor sanitation have higher rates of allergic diseases.
Genetic predisposition to this disease
Genetic predisposition plays a significant role in the development of food allergies. Research shows that if one of the parents suffers from allergic diseases, the likelihood of developing an allergy in the child increases by 2-3 times. The main genes involved are associated with the production of immunoglobulin E (IgE), as well as with the regulation of inflammatory processes. In particular, genes such as IL-4, IL-5, and FCER1 have shown their significance in genetic studies. Some genetic mutations can affect the body's ability to cope with certain allergens, such as wheat or eggs, which is also important in clinical practice.
Risk factors for the development of this disease
Risk factors associated with food allergies include both physical and chemical components, as well as lifestyle. The main risk factors include:
- Heredity: the presence of allergies in parents or close relatives significantly increases the likelihood of developing the disease in children.
- Environmental factors: Air pollution and exposure to chemicals can increase susceptibility to allergies.
- Premature introduction of certain foods into the baby's diet: The presence of allergens, such as nuts or dairy products, in the diet of infants under 6 months can have a negative impact on the development of the immune system.
- Frequent use of antibiotics in early childhood may alter the microbiome and increase the risk of allergies.
- Vitamin D deficiency, which can impair the immune system.
Diagnosis of this disease
Diagnosis of food allergies involves a comprehensive approach and is based on taking anamnesis, assessing symptoms, and conducting laboratory and radiological studies. The main symptoms include:
- Skin reactions: urticaria, eczema, itching.
- Respiratory symptoms: difficulty breathing, hoarseness, nasal congestion.
- Gastrointestinal symptoms: nausea, vomiting, diarrhea.
- Systemic reactions: anaphylaxis requiring emergency treatment.
Laboratory tests, including blood tests for specific IgE, skin tests with allergens, and provocative tests, play a key role in accurate diagnosis. Radiological methods, such as chest X-rays, can be used to exclude other diseases. The differential diagnosis includes ruling out food intolerances and other allergic diseases.
Treatment
Treatment of food allergies is primarily aimed at preventing contact with the allergen. It is important to consider:
- General treatment: Keeping a food diary to identify allergens and dietary changes.
- Pharmacological treatment: antihistamines, corticosteroids, adrenaline to relieve acute conditions.
- Surgical treatment: rarely used, but may include correction of the condition in anaphylaxis.
- Other treatments: immunotherapy, experimental methods such as desensitization.
List of medications used to treat this disease
Among the medications used to treat food allergies are:
- Antihistamines: loratadine, cetirizine, fexofenadine.
- Corticosteroids: prednisolone, betamethasone.
- Adrenaline: EpiPen autoinjectors for emergency relief of anaphylaxis.
- Immunomodulators: monoclonal antibodies such as omalizumab.
Disease monitoring
Food allergy monitoring involves regular patient assessment, symptom analysis, and monitoring of the effectiveness of the chosen treatment. It is important to note any changes in diet and respond to any allergic reactions that arise. The prognosis with dietary management is usually favorable, but food allergies can lead to serious complications, including anaphylaxis, which requires immediate intervention.
Age-related features of the disease
Food allergies can occur at any age, but the nature of the disease varies:
- In infants: High risk of developing allergies to dairy, eggs and peanuts, often resolves with age.
- In young children: Allergies to wheat and soy products are common.
- In adolescents and adults: responses to nuts, fish and seafood are often recorded.
Questions and Answers
- What causes food allergies? Food allergies occur due to an abnormal immune response to certain proteins in food.
- How to diagnose food allergies? Diagnosis is based on clinical symptoms, laboratory tests and allergy tests.
- Can I outgrow a food allergy? Many children outgrow food allergies, especially to milk and eggs, but allergies to nuts and shellfish often persist for life.
- How to treat food allergies? Treatment includes avoiding allergens, using antihistamines and, in emergency cases, adrenaline.
- What to do if anaphylaxis occurs? Adrenaline must be administered immediately and emergency medical assistance must be called.
Advice from Dr. Oleg Korzhikov
Dr. Oleg Korzhikov recommends:
- Monitor your diet and keep a food journal to identify possible allergens.
- Always carry an adrenaline autoinjector and know how to use it in an emergency.
- Discuss with your doctor the possibility of immunotherapy if you have persistent allergies.
- Keep in mind that sometimes allergies can change with age, so regular check-ups are essential.
Food allergy is a serious condition that requires care and professional attention to ensure the well-being of the patient.
