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Living With a Soy Allergy

Soy allergies start with soybeans. Soybeans are legumes. Other foods in the legume family include navy beans, kidney beans, string beans, black beans, pinto beans, chickpeas (garbanzo or chichi beans), lentils, carob, licorice, and peanuts. Many people are allergic to more than one legume. If your doctor is unable to identify which soy product is causing your allergy, it is best to avoid them all.

It is not always easy to avoid these foods since many unsuspecting products may contain soy.

Who Gets a Soy Allergy?

Soy allergies are more common in infants. The average age at which the allergy manifests is 3 months but the majority of infants outgrow it by the age of two. Although adults do suffer from soy allergy, it is rare.

What Are the Symptoms of a Soy Allergy?

Symptoms of soy allergy are many and may include:

  • Acne and other skin conditions, like eczema
  • Swelling
  • Nasal congestion
  • Anaphylaxis
  • Asthma
  • Canker sores or fever blisters
  • Colitis and other gastrointestinal problems, including diarrhea
  • Conjunctivitis, or pink eye
  • Shortness of breath
  • Fever, fatigue, weakness, and nausea
  • Low blood pressure
  • Itching
  • Hay fever
  • Hives

 

How Do I Avoid Exposure to Soy?

If you have a soy allergy, always check the label ingredients before you use a product. In addition, check the label each time you buy the product. Manufacturers occasionally change recipes, and a trigger food may be added to the new recipe.

Examples of soy products and foods that may contain soy include:

Soy Products Soy-Containing Ingredients Soy-Containing Food
Soy flour

Soy nuts

Soy milk

Soy sprouts

Soybean granules or curds

Tofu

Soy protein

Textured vegetable protein (TPV)

Hydrolyzed plant protein

Hydrolyzed soy protein

Hydrolyzed vegetable protein

Natural and artificial flavoring (may be soy based)

Vegetable gum

Vegetable starch

Miso

Soy sauce

Worcestershire sauce

Tamari

Tempeh

Vegetable broth

Some cereals

Some infant formula

Baked goods

 

WebMD Medical Reference

Reviewed by Jonathan L Gelfand, MD on February 05, 2009
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