Food Allergies
6 Case Studies
1 Member Stories
11 Research

Food allergies are an unpleasant or harmful immune system response after a specific food is eaten. The cause of food allergies is unknown. Sometimes, allergies experienced during childhood may resolve in adulthood. Symptoms of a reaction may include digestive problems, hives, or swollen airways. Severe reactions can be life-threatening. A food allergy is due to the immune system responding to the food when it does not have to.

Your immune system is not responsible for food intolerance. The majority of the time it is a problem with digesting the food. As an example, being allergic to milk differs from not being able to digest it properly due to lactose intolerance. Antihistamine drugs can treat mild reactions. The severe reaction requires immediate medical care or emergency care.

According to foodallergy.org, 32 million Americans are living with possibly life-threatening food allergies. There's been a 377% boost in the identification of anaphylactic food responses between 2007 and 2016.

What are food allergies?

Food allergy is your immune system's response that occurs soon after eating a specific food. Even a minimal amount of allergy-causing food may cause symptoms and signs such as digestive problems, swollen airways, or hives. In some people, a food allergy can result in severe symptoms or even a life-threatening reaction called anaphylaxis.

Even children can be allergic to some foods. Food allergy affects about 8% of children less than three years old and up to 10% of adults. Some children outgrow their food allergy symptoms as they become older. It's easy to confuse a food allergy using a more common reaction called food intolerance. While bothersome, food intolerance is a less severe condition that doesn't involve the immune system.

On the other hand, people with a food allergy have an immune system that reacts to specific proteins found in food. Their immune system attacks these chemicals like it were a dangerous pathogen, such as a virus or bacterium. Diagnosing food allergies can be challenging. There is no cure for food allergies.


See: Is Your Food Making You Sick?

Food allergy symptoms

Symptoms of food allergy

For some individuals, an allergic reaction to a particular food could be embarrassing but not severe. For other individuals, an allergic reaction can be downright life-threatening. Food allergy symptoms usually appear within a few minutes to 2 hours after eating the offending food. The most common food allergy symptoms and signs include:

- itching or tingling in the mouth

- nasal congestion or difficulty breathing

- hives, 

- itching 

- eczema

- welling of the  tongue, lips, face, and throat or other parts 

- abdominal pain, diarrhea, nausea or vomiting

- lightheadedness or fainting

Symptoms of anaphylaxis: Anaphylaxis means a severe allergic reaction. It typically occurs shortly after exposure to the particular allergen but might take a couple of hours. Symptoms come on quickly and can worsen and contain:

- a quick fall in blood pressure

- fear, a sense of apprehension

- itchy, tickly throat

- nausea

- respiratory difficulties, which frequently become progressively worse

- skin is itchy with a rash that spreads quickly

 - coughing

- lack of consciousness

See: Inhibitory effects of curcumin on passive cutaneous anaphylactoid response and compound 48/80-induced mast cell activation.

Food allergy triggers

Common food allergy triggers

Common foods to trigger allergic reactions in children include wheat, peanuts, soya, milk, and eggs.

In adults, they are forms of peanuts, fish, Some shellfish, such as lobster, crab, and prawns, tree nuts, like pistachios, Brazil nuts, walnuts, almonds, and peanuts.

The most common allergenic foods are:

- eggs

- fish

- berry

- nuts from trees (like hazelnuts, walnuts, almonds, and Brazil nuts)

- peanuts (groundnuts)

- shellfish (like shrimps, mussels, and crab)

- soya

- wheat


See: Food allergy diet

Food allergy vs. food intolerance difference

Food allergy vs. intolerance

Experts have discovered that many people who believe they have a food allergy really have a food intolerance, which isn't the same thing. Food intolerances don't involve IgE antibodies, though other areas of the immune system might be involved.

Symptoms may be immediate or delayed and be similar to those of food allergies. Unlike an allergy that's simply in reaction to a protein, food intolerance may occur because of proteins, compounds, carbohydrates in meals, or by a deficiency of enzymes or compromised intestinal permeability.

The individual can typically eat small quantities of that particular food without being changed. The exclusion is someone with Celiac disease.

These examples or cases are often confused for food allergies:

IBS (irritable bowel syndrome): a long-term (chronic) condition in which the patient has nausea, constipation, and stomach aches. IBS sufferers tend to be intolerant to fermentable carbohydrates.

Celiac Disorder: a long-term autoimmune digestive condition that's brought on by the use of gluten. The individual may have diarrhea, stomach pains, and bloating, though many patients are asymptomatic. There's immune system involvement, but experts say it's a food intolerance, not an allergy.

Enzymes: The individual doesn't have an enzyme (or enough of it) to digest food correctly. As an example, lactose intolerance causes gas, diarrhea, cramping, and bloating.

Food Additive sensitivity:  sulfites which can be used for maintaining dried fruits or canned foods.

Psychological Variables: some people may feel sick just thinking about a specific food. Nobody is quite sure why this occurs.

But with a food allergy, even a small amount of food is very likely to activate the immune system. A food allergy may lead to fainting, vertigo, dizziness, respiratory problems, swelling of different areas of the body, like the throat, tongue, and face, and hives. The patient may also experience tingling in the mouth.


See: Ayurveda Therapy Helps A Woman Fight Her Food And Environmental Sensitivities

Testing for food allergies

Tests performed by your doctor can include:

Skin Prick test - diluted foods are placed on the patient's arm, and then the skin is pierced, introducing the food to the system. If there is a response, such as itching, swelling, or redness, it's likely there's some type of allergy. Skin prick testing can sometimes create False-negative or false-positive outcomes. 

Elimination Diet - suspected foods aren't consumed for 4-6 weeks to see whether symptoms disappear. They are then reintroduced to confirm if symptoms return. Elimination diets should be monitored by a doctor or dietitian.  

Food Journal - patients write down what they eat and describe symptoms should they occur.

Blood Test - a patient's blood is drawn to test for IgE antibodies that are specific to specific food proteins.


See: Homeopathic and Diet Therapy for Irritable Bowl Syndrome and Food Allergies

Food allergy risk factors & complications

Food allergy risk factors include:

- Family history. You're at a higher risk of food allergies if eczema, asthma, hives, or allergies like hay fever are common in your family.

- Age. Food allergies are more common in children, particularly toddlers and babies. As you age, your digestive system matures, and your body is less likely to absorb food that triggers allergies. Luckily, children typically outgrow allergies to milk, soy, eggs, and wheat. Severe allergies and allergies to shellfish and nuts are more likely to be lifelong.

- Asthma. Asthma and food allergy symptoms commonly occur together. When they perform, both food allergy and asthma symptoms are more likely to be acute.

- Other allergies. If you are already allergic to food, you might be at a higher risk of becoming allergic to another. Likewise, if you have different kinds of allergic reactions, such as hay fever or eczema, your risk of having a food allergy is higher.


Complications of food allergy can include:

- Anaphylaxis. This is a life-threatening allergic response.

- Atopic dermatitis (eczema). Food allergy can cause a skin reaction, such as eczema.

See: Personalized Diet Program for Food Allergies and Intolerance

Food allergy prevention

Once a food allergy has developed, the best way to avoid an allergic reaction would be to understand and avoid foods that cause symptoms and signs. For some individuals, this is a mere inconvenience, but others find it a more considerable hardship. Additionally, some foods may be well-hidden in certain meals at restaurants.

If you know you have a specific food allergy, try some guidelines:

- If you had a severe reaction in the past, wear a medical alert bracelet that lets others know about your food allergy if you have a reaction, and you are not able to communicate.

- Always have some medication after consulting with your doctor

- Understand what you are eating and drinking. Make sure to read food labels carefully.

- Be cautious at restaurants. Be certain your server knows the food you're allergic to, and you will need to insist the meal does not contain it. 

See: How I controlled my Migraine with Gluten Free Diet and Lifestyle Modification

Treatment options

Elimination Diet: many individuals need to visit a dietitian after being diagnosed with a food allergy. It's important if food has to be removed from one's diet, that it's done in a manner that doesn't undermine the person's health.

For example, if the allergy is just to peanuts, there'll be no health effects if the person never eats peanuts. But, an allergy to milk means finding other sources of calcium and protein. Patients will need to read food and beverage labels carefully. Some additives, pet foods, glues, and adhesives might have traces of a food allergen. When eating out, being cautious can be particularly tricky.

You should consult a doctor or allergist if you have food allergy symptoms soon after eating. If possible, visit your doctor once the allergic reaction is occurring. If you develop symptoms of anaphylaxis, seek emergency treatment, for example, if you experience:

- Shock with a severe drop of blood pressure

- Rapid pulse

- Constriction of airways or difficulty to breathe

- Dizziness or lightheadedness

See: Elimination diets in autism spectrum disorders: any wheat amidst the chaff?

References

1. Foodallergy.org

2. Food allergy. (n.d.). NIH https://www.niaid.nih.gov/diseases-conditions/food-allergy

3. Kristen D. Jackson, M.P.H.; LaJeana D. Howie, M.P.H., C.H.E.S.; Lara J. Akinbami, M.D. (2013, May). Trends in allergic conditions among children: United States, 1997–2011. CDC

https://www.cdc.gov/nchs/products/databriefs/db121.htm

4. Smith, J. (2014, May 9). Genetically modified foods unsafe? GM foods and allergies. Global Research

http://www.globalresearch.ca/genetically-modified-foods-unsafe-evidence-that-links-gm-foods-to-allergic-responses-mounts/7277

5. Food allergy. (2016, May 16). NHS http://www.nhs.uk/conditions/food-allergy/Pages/Intro1.aspx

6. Hong, X., Tsai, H. J., & Wang, X. (2009, December). Genetics of food allergy. Current opinion in pediatrics, 21(6), 770

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892276/

7. Marra, F., et. al. (2006, March). Does antibiotic exposure during infancy lead to asthma? A systematic review and meta-analysis. Chest, 129(3), 610-618 http://www.sciencedirect.com/science/article/pii/S0012369215522617?via%3Dihub

8. Hua, X., Goedert, J. J., Pu, A., Yu, G., & Shi, J. (2016). Allergy associations with the adult fecal microbiota: Analysis of the American Gut Project. EBioMedicine, 3, 172–179 http://doi.org/10.1016/j.ebiom.2015.11.038

9. The National Institute of Allergy and Infectious Diseases: "Fact Sheet: Food Allergy and Intolerances."

10. American Academy of Allergy Asthma & Immunology. Advances in Dermatology and Allergology: "Role of immunoglobulin G antibodies in the diagnosis of food allergy."

11. Lack, G. (2012, May). Update on risk factors for food allergy. The Journal of Allergy and Clinical Immunology, 129(5), 1187-1197 http://www.jacionline.org/article/S0091-6749(12)00366-1/fulltext

12. Mayo Clinic, https://www.mayoclinic.org/diseases-conditions/food-allergy/symptoms-causes/syc-20355095

See: Immune boosting foods

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