Soy allergy

It is important to note that food allergies are common and affects both children and adults. The common foods responsible for triggering food allergies especially in children include wheat, egg, milk, soy and peanuts.

Close look on soy

Soybeans are included in the legume family along with beans, peanuts and peas. Soybeans are utilized in the commercial processing of various foods since they provide an affordable, top-quality form of protein that is readily available.

Understandably, soy protein is readily encountered in daily life with children exposed at a young age. Take note that soy protein is also a commonly used substitute for milk protein in infant formulas and often considered suitable for the GI tract of babies.

Soy milk is commonly used by adults especially those who have lactose intolerance, dairy allergy or other form of milk intolerance. It is also utilized in Asian foods including tofu, soy sauce and miso soup.

What is soy allergy?


This form of allergy can cause a number of allergy symptoms that range from atopic dermatitis, urticaria and angioedema and even anaphylaxis.

Always bear in mind that soy allergy affects both children and adults. This form of allergy can cause a number of allergy symptoms that range from atopic dermatitis, urticaria and angioedema and even anaphylaxis.

Soy allergy has the potential to trigger serious, life-threatening reactions but not as common with other food allergies such as shellfish and peanut allergy. This type of allergy is diagnosed with an allergy skin testing, but blood testing is usually performed.

The soy protein can also cause non-allergic intolerance to children called as food protein-induced enterocolitis syndrome (FPIES) which causes vomiting, nausea, dehydration, diarrhea, weight loss and even shock. The milder form of the condition that is triggered by soy formula is called food protein-induced proctitis which leads to blood-streaked stools in infants.

Can children outgrow soy allergy

Soy allergy seems to be an issue among young children but some can outgrow the allergy by the time they reach 3 years old.  In a study conducted, it was discovered that the amount of allergic antibody against soy can help determine if a child has outgrown the allergy. Nevertheless, finding out if the child has outgrown the allergy includes an oral food challenge to soy that is carried out under medical supervision.

Can a child with soy allergy develop other allergies?

Always bear in mind that soy shares similar proteins with other legumes but those with soy allergy can consume other legumes without any issues. Nevertheless, many individuals are often told to avoid all legumes since allergy testing often reveals positive results to more than one legume. Take note that this is a result of cross-sensitization which means that the similar proteins found in legumes bind to the same allergic antibodies directed against the soy proteins.

Nevertheless, several studies show that true cross-reactivity among several legumes is probably around 5%.  If an individual has positive allergy tests to several legumes, it is best to consult a doctor before eating any of these foods. Even though cross-reactivity rates among legumes are low, the doctor might perform an oral food challenge to the legume to determine that he/she is not allergic.


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