Coinciding with the German Food Allergy Day: Allergies and food intolerances have become an increasingly prominent topic in modern medicine and society over recent decades. While both conditions often produce similar symptoms, they differ fundamentally in their causes and mechanisms. This article aims to explain the development of allergies and food intolerances by illuminating the immunological and non-immunological processes that underlie these health conditions.
Definition und Unterschied zwischen Allergien und Lebensmittelunverträglichkeiten
Allergies
An allergy is an exaggerated response of the immune system to normally harmless substances known as allergens. These can be present in foods, pollen, animal dander, or other environmental factors. In an allergic reaction, the immune system mistakenly recognizes the allergen as a threat and triggers an immune response that can cause symptoms such as itching, swelling, shortness of breath, and even anaphylactic shock.
Food intolerances
Food intolerances, by contrast, are not due to the immune system. They occur when the body cannot properly digest or process certain dietary components. A well-known example is lactose intolerance, in which the body does not produce sufficient amounts of the enzyme lactase, resulting in digestive complaints such as bloating and diarrhea.
Development of allergies
Genetic predisposition
One of the main causes for the development of allergies is genetic predisposition. Children whose parents have allergies are at higher risk of developing allergies themselves. This genetic predisposition influences the way the immune system responds to certain substances.
Environmental factors
Exposure to certain environmental factors also plays a decisive role. Studies have shown that children raised in urban areas have a higher risk of developing allergies than those living in rural areas. One possible reason for this is the so-called „hygiene hypothesis“, which suggests that a lack of early exposure to microorganisms leads the immune system to react excessively.
Immunological processes
The development of an allergic reaction proceeds in several steps:
- Sensitization: On first contact with an allergen, the body produces specific IgE antibodies that bind to mast cells and basophils.
- Activation: On re-exposure to the same allergen, the IgE antibodies bind to the allergen, leading to the release of histamine and other pro-inflammatory substances.
- Symptoms: These substances cause the typical allergy symptoms, such as itching, swelling and shortness of breath.
Development of food intolerances
Enzyme deficiency
One of the most common causes of food intolerances is a deficiency of certain enzymes. For example, a deficiency of lactase leads to lactose intolerance because the body cannot split lactose into glucose and galactose. This results in an accumulation of lactose in the intestine, which is fermented by bacteria and causes associated symptoms such as bloating and diarrhea.
Non-immunological mechanisms
Another mechanism is the reaction to biogenic amines that occur in certain foods. Histamine, tyramine and other amines can cause symptoms in sensitive individuals that resemble those of an allergic reaction. These reactions are, however, not immunological but result from a direct effect of the amines on the body.
Psychosomatic factors
Some food intolerances can also be psychosomatically mediated. Stress and anxiety can affect digestive processes and provoke symptoms that could be mistaken for an intolerance. It is important to consider these factors to make an accurate diagnosis.
Diagnosis and treatment
Diagnostic procedures
The diagnosis of allergies and food intolerances requires various approaches. Allergies are often diagnosed by skin tests (prick test), blood tests (measurement of specific IgE antibodies) or challenge tests. Food intolerances are often identified through elimination diets and specific tests such as the lactose tolerance test.
Treatment options
The treatment of allergies includes avoidance of the allergen, pharmacological therapy (antihistamines, corticosteroids) and immunotherapy (desensitization). In food intolerances, the focus is on avoiding the offending substances and, if applicable, taking enzyme preparations (e.g. lactase tablets).
Prevention
Early Exposure
Early exposure to potential allergens can reduce the risk of developing allergies. Studies have shown that children who are exposed early to allergenic foods such as peanuts and eggs are less likely to develop allergies.
Lifestyle and Environmental Factors
A healthy lifestyle and an environment that does not overload the immune system can also help reduce risk. This includes a balanced diet, regular physical activity and avoiding excessive hygiene practices that could reduce exposure to harmless microorganisms.
Conclusion
Allergies and food intolerances are complex health issues caused by a combination of genetic, environmental and psychosomatic factors. While allergies represent an immunological response to harmless substances, food intolerances are usually the result of digestive problems or non-immunological reactions. Diagnosis and treatment require careful investigation and individualized approaches to improve the affected individuals’ quality of life. Through preventive measures and a better understanding of the underlying mechanisms, we can reduce the risk of these conditions developing and promote public health.