Soy, a byproduct of soy beans, is used widely in many processed foods and dairy-alternative products. MayoClinic.com says soy is one of the most common foods that cause an allergic reaction in children, primarily discovered when an infant is given soy-based formula. Although most children outgrow the allergy by age 3, anyone at any age can develop a soy allergy. If you suspect that you're allergic to soy, call your doctor.
Symptoms
Symptoms of a soy allergy are similar to other food-related allergies. Soy allergies primarily affect the digestive system, the skin and the respiratory system. According to the Cleveland Clinic, soy allergy symptoms can develop shortly after eating products that contain soy or within a few hours. Digestive symptoms include nausea, vomiting, stomach pain, cramping and diarrhea. Your skin can become inflamed and itchy, causing eczema or hives. It affects your respiratory system in the sinuses and lungs. You can form asthmatic symptoms and nasal complications as a result of a soy allergy.
The Cause
A soy allergy is caused by a malfunction of the immune system. Instead of identifying the proteins in soy as safe, the immune system mistakes them for a dangerous substance. The body reacts by creating antibodies and other chemicals that fight off the proteins. Specific antibodies, Immunoglobulin E, or IgE, antibodies are formed to attack the proteins and protect the body. IgE antibodies in the body cause mast cells to produce histamine, a chemical that can lead to inflammation and irritation in soft tissue, according to MayoClinic.com.
Diagnosis
An allergist is the most qualified medical personnel to diagnose your condition. MayoClinic.com says an allergist may recommend performing allergy tests to determine whether your body creates IgE antibodies when soy proteins are introduced. Skin prick tests and blood tests are commonly used to diagnose a soy allergy. Your allergist may also recommend an elimination diet, in which you remove all soy products for two weeks and then re-introduce them to observe how your body reacts.
Treatment
The most effective treatment for a soy allergy is to avoid any food or beverage that contains soy ingredients, according to the Cleveland Clinic. Ingredients that contain soy include soy protein, textured vegetable protein, vegetable gum, vegetable starch, hydrolyzed plant protein and flavoring. Some unsuspected foods that may contain soy are ice cream, baked goods and processed meats.
