🥜 Men's Health

Food Allergy Guide Nigeria

Recognising, diagnosing, and managing food allergies in Nigerian adults and children

Food allergy is an immune-mediated reaction to a specific food protein — distinct from food intolerance (which doesn't involve the immune system). In Nigeria, food allergy awareness is limited, and reactions are often attributed to 'body system' problems, spiritual causes, or environmental factors. The most allergenic foods globally (peanuts, tree nuts, shellfish, fish, milk, egg, wheat, soy) are all present in Nigerian cuisine. While severe anaphylaxis from food allergy is less publicised in Nigeria, it causes deaths that could be prevented with recognition, preparation, and access to adrenaline (epinephrine).

Signs and Symptoms

✓ Skin: urticaria (hives) — raised, itchy, red welts appearing within minutes of eating

✓ Angioedema: swelling of lips, tongue, eyelids, face — may be dramatic

✓ Gastrointestinal: nausea, vomiting, abdominal cramps, diarrhoea within 2 hours of eating

✓ Respiratory: nasal congestion, sneezing, wheezing, cough

✓ Anaphylaxis (severe, systemic): throat tightening/swelling, difficulty breathing, drop in blood pressure, collapse — LIFE-THREATENING

✓ Oral allergy syndrome: itching and tingling in the mouth immediately after eating raw fruits/vegetables

✓ Eczema flares in children: worsening of atopic dermatitis after specific foods

Risk Factors

Family history of food allergy or atopy (asthma, eczema, hay fever)
Personal history of another allergic condition
Infant atopic dermatitis (eczema): highest risk factor for developing peanut allergy
Delayed introduction of allergenic foods in infancy (early introduction now recommended to prevent allergy)
Nigerian food allergens: peanuts (groundnuts) — common ingredient; shellfish (crayfish, periwinkle, prawns) — in soups; fish (stockfish, fresh fish); sesame in some preparations; milk and eggs in baked goods

When to Seek Help

Signs of anaphylaxis — call for help immediatelyThroat swelling, difficulty breathing, collapse, severe vomiting after eating — use adrenaline auto-injector if available, call ambulance, go to nearest A&E

Urticaria (hives) over body within 1 hour of eatingLikely allergic reaction — antihistamine, observe for 2–4 hours. If symptoms progress, go to hospital immediately

Repeated unexplained reactions to foodKeep a food diary and see an allergist or immunologist for formal testing

Diagnosis in children with eczemaFood allergy triggers eczema in 30–40% of children with moderate-severe eczema — allergy testing can identify and allow dietary management

Before travelling with known severe allergyEnsure adrenaline auto-injector is available, carry allergy alert card, and research Nigerian emergency services availability

Tests & Diagnosis

🧪 Skin prick test (SPT)

Small amount of allergen extract pricked into skin — wheal > 3mm indicates sensitisation. Fast, cheap, reliable. Available at some allergy clinics in Lagos and Abuja

🧪 Specific IgE blood test (RAST)

Blood test measuring IgE antibodies to specific foods. Useful when skin testing not possible (severe eczema, patient on antihistamines)

🧪 Oral food challenge (OFC)

Gold standard for diagnosis — supervised eating of suspect food in a controlled medical setting with resuscitation available. Done at specialist centres only

🧪 Elimination diet + reintroduction

Suspect food removed for 2–4 weeks, then reintroduced under supervision — practical and widely used when formal testing unavailable

🧪 Total IgE

Elevated total IgE suggests atopic constitution — not specific for a single allergen

Treatment Options

Strict avoidance of the culprit food

The cornerstone of food allergy management. Read all ingredient labels carefully — crayfish and groundnut oil appear in many Nigerian processed foods and restaurant meals

Antihistamines for mild reactions

Cetirizine (Zyrtec) or loratadine (Clarityn) for urticaria and mild reactions — do not use for anaphylaxis (too slow, inappropriate for severe reactions)

Adrenaline (epinephrine) auto-injector

EpiPen or equivalent — prescribed for anyone at risk of anaphylaxis. Injected into outer thigh. Should be carried at all times. Unfortunately, adrenaline auto-injectors are not reliably available in Nigeria — work with your allergist on an emergency action plan

Corticosteroids

Oral prednisolone or IV hydrocortisone — prevents late-phase allergic reactions after initial treatment of anaphylaxis

Allergen immunotherapy (desensitisation)

Oral immunotherapy (OIT) for peanut allergy (Palforzia) and other foods — gradually increasing doses to build tolerance. Not yet widely available in Nigeria

School and restaurant management

Written allergy action plan for children. Alert restaurants — 'I am allergic to peanuts/crayfish — this will cause a severe reaction.' Chef cards in Yoruba, Igbo, and Hausa are being developed by some allergy advocacy groups

Frequently Asked Questions

Is crayfish allergy common in Nigeria?

Shellfish allergy (which includes crayfish and periwinkle) is one of the most common and potentially severe food allergies globally. In Nigeria, crayfish is ubiquitous — present in most soups, jollof rice, and stews, often as a flavouring. Shellfish allergy typically persists lifelong (unlike milk and egg allergy, which children often outgrow).

Can food allergy develop in adulthood?

Yes. While many food allergies develop in childhood, new allergies can develop at any age. Shellfish and fish allergy commonly present for the first time in adults. If you suddenly react to a food you've eaten before, food allergy should be considered.

Is food intolerance the same as food allergy?

No. Food intolerance (e.g., lactose intolerance, gluten sensitivity) causes gastrointestinal symptoms (bloating, diarrhoea) through non-immune mechanisms — it is uncomfortable but not life-threatening. Food allergy involves the immune system and can cause anaphylaxis. The distinction matters for management.

Does my child need to avoid their allergen forever?

Not necessarily. Milk, egg, wheat, and soy allergies are often outgrown by age 5–10. Peanut, tree nut, shellfish, and fish allergies typically persist lifelong. Regular re-evaluation with oral food challenges under medical supervision can determine if tolerance has developed.