Saturday, February 17, 2024

Soy Allergy Symptoms In Adults

What Causes An Allergy To Soy

Food Allergy 101: Soy Allergy Symptom | Avoid Soy Products

As was touched on previously, an allergy to soy happens when your body ingests the soy protein and recognizes it as harmful. Because your body detects an invader, it releases chemicals that cause an allergic response.

FARE, an organization dedicated to sharing knowledge about food allergies, explains that people who are allergic to soy are often more sensitive or allergic to other major allergens, including:

  • Some kinds of peanut butter
  • Certain processed meats

Because many foods, sauces, and beverages can unsuspectingly contain soy, its crucial to read food labels. Furthermore, if youre at a cafe or restaurant, explain your allergy to the server and ask that they ensure your meal is completely free of soy.

Most restaurants take allergies seriously and will do their best to accommodate you. Also, it can be helpful to call ahead of time to see if the kitchen can prepare.

What are the risk factors?

Soy allergy is more typical in babies and young kids than in older kids. Fare explains that about 0.4% of infants in the USA have an allergy to soy. Therefore, its most common to develop in youngsters.

Furthermore, Coastal Allergy Asthma notes that the three main factors that increase your risk of developing an allergy to soy are:

  • Family history: You may be more susceptible if it runs in your family.
  • Age: This allergy often develops in infants and young kids but can also develop in adults.
  • Other food allergies: If youre allergic to other foods, you can be at a higher risk.
  • How Long Do Allergy Symptoms Last

    The duration of soy allergy symptoms can vary widely from person to person. Factors like stress and emotional state can contribute to the severity and duration of allergic reactions, as well as factors like age, immunity, and other biological conditions.

    In general, soy allergy symptoms can last for about 48 hours on average after a reaction begins. However, some individuals who are soy-allergic have reported their symptoms diminishing within a few hours after onset. In other severe cases, allergy symptoms can linger for several days to even lasting upwards of a week or longer.

    The longevity of allergy symptoms can also be viewed from a development perspective, such as when an allergy is detectable in children and when allergic reactions dissipate. Because soy allergy is one of several food allergies that commonly begins during the early stages of life, this is a particular topic of interest among parents with soy-allergic children.

    Soy allergy usually occurs within the infant and toddler stages before the age of 3. This can include cross-reactive symptoms with other foods, such as cows milk and peanuts. Studies indicate that 50 percent of soy-allergic children outgrew their allergy by age 7 years, and 69 percent kicked allergic symptoms by age 10 years4.

    Risk Of Other Food Allergies

    Soy does have similar proteins to those found in other legumes, such as peanuts, peas, beans, and lentils. However, most people with a soy allergy can eat other legumes without having a reaction.

    Still, people with a soy allergy are often told to avoid all legumes. That’s because allergy tests often show positive allergy results to more than one legume.

    These results happen because the proteins similar to the ones found in legumes bind to the same allergic antibodies against soy proteins. This is called cross-sensitization.

    Research has shown that when soy-allergic people eat other legumes, true allergic reactions do not happen often. About 95% of people with a soy allergy can eat other legumes.

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    Soy Allergy Symptoms And Diagnosis

    Many soy allergy symptoms are uncomfortable but not life-threatening. Symptoms of a food allergy typically develop within a few minutes or hours following consumption of food with the allergen.

    Soy allergy symptoms may include:

    • Skin reactions including hives and eczema
    • Swollen lips, face, tongue, throat, or other body part
    • Runny nose and wheezing
    • Nausea, diarrhea, or vomiting

    In rare cases, severe reactions to soy may cause anaphylaxis. This reaction is more common with people who have asthma or other serious food allergies besides soy.

    Anaphylaxis symptoms may include:

    • Dizziness or loss of consciousness
    • Difficulty breathing due to a swollen throat
    • Drop in blood pressure and shock

    Symptoms Of Soy Allergy

    Autistic for a Day

    Ha Min-seo

    Soy is one of the most frequent causes of allergies inchildren, and it can start as early as in infancy when babies may get an allergicreaction to infant formula containing soy. By the age of three, most childrenwill stop experiencing these reactions although in some cases it may continue throughoutthe adulthood as well. Adults can also have soy allergy and reactions range from mild to severe where theperson may undergo anaphylactic shock, which can be life threatening. It isimportant to notify the doctor of any reaction the person might have to soy after which they can take action to prevent future or more severe reactions.


    In most cases, soy allergies pass without any seriousconsequences and signs appear minutes to an hour after the consumption of troublesomefood. The person allergic to soy may experience a tingling feelingin the mouth, nausea, vomiting, diarrhea and pains in the abdominal area, while partsof the body such as the face, lips, tongue and throat may start to swell. Theperson will feel dizzy, light-headed or may even faint and breathing may become difficult, due to a runny nose. Their skin may itch or they can get hives oreczema.

    Severe reaction tosoy

    Soy allergy ininfants


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    Ige Food Allergy Testing At Home

    Try the Everlywell at-home Food Allergy Test to learn your IgE reactivity to common food allergens, including soy. If you receive test results indicating increased reactivity that may be connected with a food allergy, you will receive a call from a nurse to help with next steps.


    1. The Science of Soy: What Do We Really Know? Environmental Health Perspectives. URL. Accessed June 16, 2022.

    2. Soy. Food Allergy Research & Education. URL. Accessed June 16, 2022.

    3. Soy Allergy: Symptoms, Treatments, & Tests. Mayo Clinic. URL. Accessed June 16, 2022.

    4. Prevalence and Severity of Food Allergies Among US Adults. JAMA Network Open. URL. Accessed June 16, 2022.

    5. The natural history of soy allergy. The Journal of Allergy and Clinical Immunology. URL. Accessed June 16, 2022.

    6. Soy Allergy. Asthma and Allergy Foundation of America. URL. Accessed June 16, 2022.

    7. Soy Allergy Diet. Johns Hopkins Medicine. URL. Accessed June 16, 2022.

    8. Soy Foods & Soy Protein. Cleveland Clinic. URL. Accessed June 16, 2022.

    Soy Milk Allergy Symptoms

    Soy milk can be consumed by people who cannot drink cows milk due to lactose intolerance. However, soy milk can also cause allergic reactions in some individuals. In fact, an allergy to soy products is one of the most common food allergies in the world. Occasionally, it can also cause a life-threatening condition, called anaphylaxis.


    All types of allergies are caused by a hyperactive immune system, which recognizes some harmless substances as foreign invaders. Any substance that triggers a hypersensitive immune reaction or an allergic reaction is called an allergen. In case of soy milk allergy, the allergen is the protein found in soy milk. This protein is identified by the immune system as a harmful substance, for which it stimulates the production of antibodies , in order to destroy or neutralize the protein.

    After this, whenever soy milk is ingested, the antibodies recognize the specific protein, and trigger the immune system to release histamine and other chemicals into the bloodstream. These chemicals are responsible for producing the symptoms associated with an allergic reaction. Food allergies are often observed to run in families. However, it does not mean that an individual is going to develop an allergy to soy milk, just because a member of his or her family has soy milk allergy. But such an individual can have a higher risk of developing soy or any other types of allergies.

    Signs and Symptoms

    Diagnosis and Treatment



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    What Medications Are Used To Treat A Soy Allergy

    If you have a soy allergy, your healthcare provider should prescribe you an epinephrine auto-injector . Epinephrine quickly reverses the symptoms of anaphylaxis. Your provider will explain when and how to use this device. You should keep your epinephrine injector with you at all times.

    People who have a soy intolerance or a non-IgE-mediated soy allergy dont need a prescription for epinephrine.

    What are the side effects of epinephrine injections?

    Epinephrine injection side effects may include:

    These symptoms are typically mild if they occur, and they go away quickly.

    What You Can Do In The Meantime

    What is a Soy Allergy? (Symptoms, Causes, Treatment, Prevention)

    Symptoms of soy allergy in babies may appear when a baby starts a soy-based infant formula. If you suspect your baby is allergic to soy, reduce exposure to allergens by feeding him or her breast milk. If your baby is eating solid foods, avoid products with soy.

    © 1998-2022 Mayo Foundation for Medical Education and Research . All rights reserved.Terms of Use

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    What Is A Soy Allergy

    Soy allergy is one of the most common food allergies in infants and children. This food allergy is often outgrown by the age of 3. Symptoms of a soy allergy may be mild or severe, and can include:

    • Hives, itching or eczema
    • Tingling sensation in the mouth
    • Swelling of lips, face, tongue, throat or other parts of the body
    • Wheezing, runny nose or trouble breathing
    • Abdominal pain, diarrhea, nausea or vomiting
    • Dizziness, lightheadedness or fainting

    Some people may have a serious reaction to soy called anaphylaxis, which is potentially life-threatening if it is not treated. Discuss symptoms and treatment options with your doctor. Call 911 if breathing becomes difficult.

    Q: What Is A Soy Lecithin Allergy

    A: According to the University of Nebraska Food Allergy Research and Resource Program, soybeans are often considered allergenic causing foods. Furthermore, the allergy is caused by the protein within soy. However, most of the protein is removed during soy lecithin manufacturing. Therefore, its believed that soy lecithin only contains trace levels of soy proteins. So soy lecithin is considered to contain not enough soy protein residues to cause allergic symptoms in most soy-allergic people.

    But, theres the chance that those more sensitive to soy may negatively react to soy lecithin. In short, a soy lecithin allergy isnt as common but can take place. To avoid taking chances:

    • Read food labels.
    • Ask your doctor about symptoms of soy sensitivity.
    • Ask your doctor about symptoms of soy intolerance .
    • Dont eat anything youre unsure of.

    Main takeaway: A soy lecithin allergy isnt as common, but it doesnt mean those with an allergy to soy should ignore this ingredient. Speak to your physician to better understand symptoms of soy sensitivity, intolerance, and allergy.

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    The Sensitivity Problem With Soy

    Like many cases of food intolerance, soy sensitivity can be a spectrum ranging from mild intolerance to full-blown allergy. At either end of the spectrum, different biological responses can occur in the body. In the case of a true soy allergy or soy sensitivity, an individuals immune system defenses are triggered which can cause symptoms to flare.

    Soybeans are a member of the legume family, which include beans, peas, lentils, and peanuts. Although its rare for someone with a peanut allergy to react to soy exposure, the reverse has been shown to tell a different story.

    One study found that up to 88 percent of individuals that where allergic to soy also had a peanut allergy or were significantly sensitive to peanuts. Additionally, individuals that were allergic to soy were more likely to be allergic or sensitive to other major allergens, including tree nuts, eggs, and cows milk2.

    Soy is one of the big eight allergens next to foods like eggs, cows milk, fish, shellfish, peanuts, tree nuts, and wheat. These foods account for over 90 percent of all food allergies. In the U.S., the Food and Drug Administration requires food manufacturers and producers to mention these foods on packaging and labels to properly warn consumers of such ingredients.

    What Is The Difference Between A Soy Allergy And A Soy Intolerance

    Symptoms of Allergies (+ 4 Natural Home Remedies!)

    Some persons have a mild variation on a soy allergy called a soy intolerance. Unlike a food allergy, an intolerance does not cause the bodys immune system to produce antibodies to the introduced substance. Persons with intolerances can often eat small amounts of the food in question without much difficulty. In larger quantities, they may experience a gastrointestinal reaction, such as an upset stomach or abdominal cramping.

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    Whats A Soy Allergy Vs Intolerance

    Many adverse reactions to soy exposure are not considered true allergies. In general, soy allergy is an IgEimmune system response that can have an effect on multiple organs of the body.

    Conversely, experiencing isolated digestive symptoms or other symptoms such as tiredness, skin rashes, migraines, headaches and low mood can indicate a soy intolerance, not an allergy. When a soy-allergic person is exposed to soy, the proteins in the soy bind to specific IgE antibodies produced by the individuals immune system. This triggers the bodys immune defenses, which can lead to reaction symptoms that can range from mild or very severe.

    With soy intolerance, a common response among those with sensitivity issues is that soy does not agree with them. This can show up as gastrointestinal and digestive problems, such as cramping or diarrhea, as well as headaches, dizziness, and nausea as well as the other symptoms mentioned above. On the other hand, symptomatic reactions from a soy allergy are often much more intense. They can rapid and severe, or they may occur gradually within 30 minutes or up to two hours later. With an allergy, the body reacts to soy protein as if it were fighting a disease-producing microorganism. With an intolerance or sensitivity the immune system can also be triggered but the symptoms are delayed and thats why the test to do for soy intolerance or sensitivity is the soya-specific IgG test not a soya-specific IgE allergy test.

    What Are Some Common Soy Allergy Symptoms

    Allergies to soy are particularly common in young children. They’re often diagnosable once a baby starts drinking formula. Often, children outgrow their soy allergies by the time they’re three years old. Normally, an allergy to soy isn’t that dangerous — just uncomfortable. But sometimes an allergic reaction can be fatal. The more benign soy allergy symptoms include a tingling feeling in your mouth, swelling, hives, difficulty breathing, runny nose, diarrhea, vomiting and dizziness. The most dangerous symptom of an allergy to soy is anaphylaxis, which is identifiable by constricted airways, a loss of blood pressure, a fast pulse, dizziness, flushing and a change in your voice. If you have these symptoms, get medical help immediately. Most symptoms set in within minutes to an hour after eating food that has soy in it.

    Soy allergies, like all food allergies, are the result of your body’s misidentification of certain proteins. When it comes to soy, at least 15 different proteins can trigger an allergic reaction. Once your body has flagged soy protein as a danger, it releases an antibody called immunoglobulin E to combat the allergen. The antibody then triggers a bunch of chemicals to neutralize the soy protein. Your body’s reaction to those chemicals is what causes allergic symptoms.

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    What Is Soy Allergy

    According to Allergy & Asthma Specialists, an informative blog created by board-certified allergists, an allergy to soy can be common and often begins at a young age. An infant, for instance, can develop an allergy when exposed to soy-based baby formula.

    While many kids outgrow their allergy to soy, it can continue into adulthood.

    An allergy to soy is caused when your bodys immune system identifies soy proteins as harmful. Therefore, when your system comes into contact with a food or drink that contains soy, antibodies in your body see the soy as an enemy invader and unleash chemicals like histamine into your bloodstream.

    The symptoms caused by an allergy to soy can be mild or severe. Furthermore, extreme allergy responses to soy can even cause a life-threatening reaction known as anaphylaxis, which well explain in more detail later.

    What does a soy allergy look like?

    Foods That Commonly Contain Soy

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    The Food Allergen Labeling and Consumer Protection Act of 2004 requires all food manufacturers to clearly state whether a food allergen is present. Soy is one of eight allergens that currently fall into this category, which includes any soy-based ingredient. Those with a soy allergy may experience an allergic reaction after eating the following foods:

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    When To See A Doctor

    See your primary care doctor or a doctor who specializes in treating allergies if you experience food allergy symptoms shortly after eating. If possible, see your doctor during an allergic reaction.

    Seek emergency treatment if you develop signs or symptoms of anaphylaxis, such as:

    • Difficulty breathing
    • Drooling and inability to swallow
    • Full-body redness and warmth

    Can Babies Be Fed Soya Drink

    Soya-based infant formulas are not considered a suitable alternative to cows milk formula for infants less than six months old. After six months old, soya-based infant formula may be considered for some children, but it is important to seek the advice of a healthcare professional or your GP.

    In the UK, soya infant formula is not generally recommended by healthcare professionals for those with cows milk allergy, as some children who are allergic to cows milk protein are also allergic to soya protein.

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