Food allergy living in pregnancy

Overview

Food allergy living in pregnancy means managing a food allergy while you are pregnant. It involves taking extra care to avoid foods that trigger an allergic reaction, while also making sure you and your baby get the nutrition you need.

Food allergies affect around 2% of adults. Many women with food allergies have healthy pregnancies.

It affects pregnant women who already have a diagnosed food allergy. It can also affect women who develop new allergies during pregnancy, though this is rare.

Symptoms

Common symptoms

• Hives (raised, itchy red bumps on the skin)
• Swelling of the lips, tongue, or throat
• Tingling mouth
• Stomach pain, nausea, or vomiting
• Diarrhea

Symptoms in children

• Skin rashes (eczema)
• Vomiting or diarrhea
• Wheezing or difficulty breathing

Symptoms in older adults

• Same symptoms as adults, but older adults may have other health conditions that make reactions harder to manage.

Causes

Main causes

• The body's immune system overreacts to a harmless food protein (allergen).
• Common triggers include peanuts, tree nuts, milk, eggs, soy, wheat, fish, and shellfish.

Risk factors

• Having other allergic conditions like asthma or eczema
• Family history of food allergies
• Being pregnant with a partner who has allergies (rare)

When to see a doctor

See a doctor urgently if:

• If you have any signs of a severe allergic reaction (anaphylaxis), call your local emergency number immediately.
• If you have difficulty breathing, swelling in the mouth or throat.

Book a routine appointment if:

• If you suspect you have a new food allergy during pregnancy
• If your current food allergy seems worse or harder to control
• To discuss safe eating and nutrition with your doctor or midwife

Diagnosis

Your doctor will take a detailed history of your symptoms and what you eat. They may also do allergy tests, such as skin prick tests or blood tests. During pregnancy, skin tests are generally safe, but your doctor will discuss the best approach.

Tests that may be done

• Skin prick test (small amount of allergen placed on your skin to see if a reaction occurs)
• Blood test (measures allergy antibodies in your blood)
• Food diary (writing down what you eat and any symptoms)

What to expect at your appointment

You may be referred to an allergy specialist. The tests are quick and usually painless. Your doctor will explain the results and help you plan how to avoid your trigger foods safely during pregnancy.

Treatment

Treatment focuses on avoiding the food that causes your allergy. If you have a severe allergy, your doctor may recommend carrying an adrenaline auto-injector (like an EpiPen). Always use it as prescribed and seek emergency help after use.

Self-care at home

• Read food labels carefully every time you shop
• Tell your restaurant server about your allergy
• Carry a written food allergy action plan
• Wear a medical alert bracelet if your allergy is severe

Medical treatments

For severe allergic reactions, emergency treatment includes giving adrenaline (epinephrine) via an auto-injector. Antihistamines can help with mild symptoms like hives. Always follow your doctor's plan. Do not take any new medicines without checking with your midwife or doctor.

When is surgery considered?

Not applicable.

Living with this condition

Living with a food allergy during pregnancy means being extra vigilant about what you eat. You need to avoid your triggers while also eating a balanced diet for your baby's growth. Work with a dietitian if needed.

Lifestyle tips

• Keep a food diary to track what you eat
• Plan meals ahead to avoid accidental exposure
• Inform your birth team about your allergy and emergency plan
• Avoid sharing utensils or plates that may have touched allergens

Diet and exercise

Aim for a healthy, varied diet that avoids your allergen(s). If you are avoiding major food groups (like milk or wheat), ask a dietitian for alternatives to ensure you get enough calcium, iron, and vitamins. Gentle exercise like walking is safe, but avoid exercising right after meals if you have a history of exercise-induced anaphylaxis.

Mental health and emotional wellbeing

Being pregnant and having a food allergy can cause anxiety. You may worry about accidental exposure or harming your baby. It's normal to feel stressed. Talk to your midwife or doctor about your feelings. If you feel overwhelmed, reach out for support. If you have thoughts of harming yourself or your baby, call emergency services.

Prevention

You cannot prevent food allergies from developing, but you can reduce the risk of severe reactions by strict avoidance. During pregnancy, there is no strong evidence that avoiding common allergens (like peanuts) prevents allergies in your baby. In fact, current guidelines suggest that if you are not allergic, you can eat peanuts and other foods as usual.

Vaccines

Omit

Screening programmes

Omit

Complications

If left untreated

• Severe allergic reaction (anaphylaxis) that can be life-threatening for you and your baby
• Poor nutrition if you avoid entire food groups without proper substitutions
• Increased stress and anxiety affecting your pregnancy

Long-term outlook

With proper management, most women with food allergies have safe and healthy pregnancies. Planning ahead and working with your healthcare team can help you enjoy this time. Your baby's risk of developing food allergies is only slightly increased if you have allergies, and many children do not inherit them.

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