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Soy allergy: Allergic reaction to soy and soy products

  1. Soy is a product of soybeans, which are in the legume family (along with beans, lentils, peas and peanuts). It is a common ingredient in infant formulas and many other processed foods. Some patients, especially young children, have an allergic reaction to soy and soy products. Nausea, rashes and a stuffy nose are some of the common signs of a soy allergy. Very sporadically, a serious, life-threatening reaction with difficulty in breathing and other serious signs develops. Drug treatment can be used for both mild and severe symptoms.

Soybean sources

  1. In addition to soymilk, soy ice cream, soy cheese, soy yogurt, soy flour and soy sauce, soy is found in some infant formulas, canned broths, soups, canned tuna, processed meats and hot dogs, energy bars, cereals, pastries and many other processed foods. Soy is also a common ingredient in Asian cooking and is sometimes found in chicken nuggets, low-fat peanut butter, alternative nut butter and vodka. Patients with a soy allergy should also not be allowed soy milk, soy yoghurt

Epidemiology of allergy to soy and soy products

  1. Soy allergies are one of the most common food allergens in young children. Allergic Reactions

Causes of soy allergy

  1. Food allergies are the result of a reaction of the immune system. With a soy allergy, the immune system thinks that certain soy proteins are harmful. In response to this, immunoglobulin E (IgE) antibodies are produced against the soy protein (allergen = triggering agent of an allergic reaction). The next time the patient comes into contact with soy, these IgE antibodies recognize the allergen and instruct the immune system to release histamine and other chemicals into the bloodstream. Histamine and other substances in the body cause a variety of allergy symptoms. Histamine is partly responsible for most allergic reactions, including a runny nose, itchy eyes, a dry throat, a rash and hives, nausea, diarrhea, difficulty breathing and anaphylactic shock

Risk factors

  1. If other allergies such as hay fever, asthma, hives or eczema (chronic skin disease with dry skin and itchy skin) are present in family members, a patient is more likely to experience an allergic reaction to soy and soy products. In addition, patients suffering from other allergies such as a wheat allergy, a bean allergy, a milk allergy


  1. Mild signs

Diagnosis and investigations

  1. The allergist goes through the medical history

Treatment of food allergy

  1. Avoid soy

Prognosis of allergic reaction to soy

  1. Seventy percent of children eventually outgrow a soy allergy before the age of ten. Other patients last longer and sometimes even into adulthood.

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