Food allergy living in adults

Overview

A food allergy is when your immune system mistakenly treats a certain food as harmful and reacts to protect you. This can cause mild to severe symptoms, often within minutes of eating the food.

Yes, about 10% of adults have a food allergy. It is less common in adults than in children, but many people continue to have allergies into adulthood or develop new ones.

Adults of any age can have a food allergy. Some people have had it since childhood, while others develop new allergies later in life, often to shellfish, tree nuts, or fish.

Symptoms

Common symptoms

• Hives (raised, itchy bumps on the skin)
• Itching or tingling in the mouth
• Swelling of the lips, face, tongue, or throat
• Nausea, vomiting, or stomach pain
• Diarrhoea
• Runny or stuffy nose

Symptoms in children

• Same as above, but children may also show irritability, crying, or refusing food.
• Skin reactions like eczema or hives are very common.

Symptoms in older adults

• Older adults may have more severe reactions due to weaker immune systems or other health conditions.
• Symptoms like low blood pressure, dizziness, or confusion may be more pronounced.
• They may take medications that can mask or worsen symptoms.

Causes

Main causes

• The immune system mistakes a food protein (allergen) as harmful and releases chemicals like histamine to attack it.
• The first exposure may cause no symptoms, but later exposures trigger the reaction.

Risk factors

• Having other allergies (like hay fever or asthma) or eczema.
• Family history of food allergies or other allergic conditions.
• Certain professions (e.g., food handlers) may develop allergies to ingredients they work with.

When to see a doctor

See a doctor urgently if:

• After any reaction, especially if breathing is affected or you used emergency medicine like an epinephrine auto-injector (if prescribed).
• If you have a severe reaction and need advice on what to do next.

Book a routine appointment if:

• If you suspect you have a food allergy and want a proper diagnosis.
• To get a management plan and prescriptions for emergency medications like antihistamines or adrenaline auto-injectors.
• To discuss challenges with managing your allergy, such as eating out or travelling.

Diagnosis

Your doctor will take a detailed history of your reactions and recommend tests to confirm which foods you are allergic to.

Tests that may be done

• Skin prick test – a small drop of food extract is placed on your skin, and the area is pricked to see if a reaction occurs.
• Blood test – measures the amount of specific antibodies (IgE) to certain foods.
• Oral food challenge – you eat small amounts of the suspected food under medical supervision to see if you react.

What to expect at your appointment

An allergy specialist (allergist) will guide you through the process. Tests are usually safe but should only be done in a clinic where emergencies can be treated. You may need to stop certain medicines before testing.

Treatment

There is no cure for food allergy. The main treatment is to avoid the trigger food completely. For accidental exposures, medicines can manage symptoms.

Self-care at home

• Read all food labels carefully every time – ingredients can change.
• Tell restaurant staff about your allergy and ask about ingredients.
• Carry a written action plan from your doctor.
• Always have emergency medicines (like antihistamines or an adrenaline auto-injector if prescribed) with you.

Medical treatments

Medicines can help control reactions. Antihistamines are used for mild symptoms like hives or itching. Adrenaline (epinephrine) is the treatment for severe reactions (anaphylaxis) and must be given quickly, often with an auto-injector your doctor can prescribe. No specific drug names or doses are listed here – always follow your doctor’s instructions.

Living with this condition

Living with a food allergy means planning ahead. You will need to check ingredients, communicate your allergy to others, and always carry emergency medicine. Many people successfully manage this and lead normal lives.

Lifestyle tips

• Plan meals and snacks to ensure safe options.
• Educate family, friends, and coworkers about your allergy and what to do in an emergency.
• Wear a medical alert bracelet or necklace that lists your allergies.

Diet and exercise

Eat a balanced diet with safe foods – a dietitian can help you avoid nutrient gaps. For some people, exercise shortly after eating a trigger food can increase the risk of a reaction, so wait a few hours after meals before exercising.

Mental health and emotional wellbeing

Food allergies can cause anxiety, fear of accidental exposure, and social isolation. It is normal to feel worried, but with good management and support, these feelings can be managed.

Prevention

For adults who already have a food allergy, prevention means avoiding the trigger food. There is no known way to prevent new food allergies from developing, though eating a healthy diet and managing other allergies may help. In infants, early introduction of certain foods (like peanuts) may reduce the risk of those allergies, but this does not apply to adults.

Complications

If left untreated

• Anaphylaxis – a severe, life-threatening reaction that requires immediate medical help.
• Poor nutrition if you avoid many foods without proper substitutes.
• Chronic stress, anxiety, or depression due to constant vigilance.

Long-term outlook

With the right diagnosis, management, and emergency plan, most adults with food allergies live full, healthy lives. Research continues to improve treatments and quality of life.

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