Also known as: IgE-Mediated Food Allergy
Food allergies occur when the immune system overreacts to specific food proteins, triggering symptoms ranging from mild hives and digestive upset to severe, potentially life-threatening anaphylaxis.
Food allergies affect approximately 6–8% of children and 2–3% of adults worldwide, though prevalence has been increasing over recent decades. The eight most common food allergens are milk, eggs, peanuts, tree nuts, wheat, soy, fish, and shellfish.
In an allergic reaction, the immune system produces IgE antibodies against specific food proteins. On re-exposure, these antibodies trigger mast cells to release histamine and other chemicals, causing symptoms that can range from mild (hives, tingling mouth) to severe (anaphylaxis).
The mainstay of management is strict avoidance of trigger foods and carrying emergency epinephrine. Oral immunotherapy for certain allergens (particularly peanut) is an emerging treatment option.
People with Food Allergies often experience the following symptoms.
Hives (urticaria), eczema flare-ups, flushing, or generalised itching, often among the first symptoms to appear within minutes of exposure.
Nausea, vomiting, abdominal cramping, and diarrhoea may occur within minutes to hours of ingesting the allergen.
Throat tightness, hoarseness, wheezing, coughing, and nasal congestion indicate more significant allergic involvement.
A severe, systemic reaction involving multiple organ systems. Symptoms include throat swelling, severe breathing difficulty, rapid pulse drop in blood pressure, and loss of consciousness.
Certain factors may increase your likelihood of developing Food Allergies.
Common approaches to managing food allergies. Always consult a healthcare provider for personalized treatment.
Reading food labels carefully, informing restaurant staff, and avoiding cross-contamination are essential daily management strategies.
People with a history of severe reactions should carry epinephrine (EpiPen) at all times and know how to use it. It is the first-line treatment for anaphylaxis.
Oral antihistamines can manage mild symptoms like hives and itching but are NOT a substitute for epinephrine in severe reactions.
Gradually increasing doses of the allergen under medical supervision can build tolerance in some individuals, particularly for peanut allergy.
Diagnosis involves skin prick testing, specific IgE blood tests, and clinical history. An oral food challenge under medical supervision is the gold standard for confirming or ruling out a food allergy.
Call emergency services immediately if you experience throat swelling, difficulty breathing, rapid pulse, dizziness, or loss of consciousness after eating — these are signs of anaphylaxis.
Steps that may help reduce the risk of developing or worsening food allergies.
Early introduction of allergenic foods (around 6 months) may reduce risk
Breastfeeding may offer some protection
No evidence that maternal dietary restriction during pregnancy helps
Maintain skin barrier health in infants with eczema
If left untreated or poorly managed, food allergies may lead to:
Many children outgrow allergies to milk, egg, wheat, and soy by school age. Allergies to peanuts, tree nuts, fish, and shellfish are more likely to persist into adulthood.
Food allergy involves the immune system and can be life-threatening. Food intolerance (like lactose intolerance) involves digestive issues and is uncomfortable but not dangerous.
Yes, it is possible to develop new food allergies at any age. Shellfish allergy, for instance, commonly develops in adulthood.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.