Around one or two people out of every 100 in the UK have a food allergy, but food intolerance is more common.
Genuine food allergy is rare. About 2% of the population and 8% of children under the age of three are affected.
What is a food allergy?
A Food Allergy is a rapid and potentially serious response to a food by your immune system. It can trigger classic allergy symptoms such as a rash, wheezing and itching.
The most common food allergies among adults are to fish, shellfish and nuts, including peanuts, walnuts, hazelnuts and brazil nuts. Children often have allergies to milk and eggs as well as to peanuts, other nuts and fish.
What is a food intolerance?
Food intolerances are more common than food allergies. The symptoms of food intolerance tend to come on more slowly, often many hours after eating the problem food. Typical symptoms include bloating and stomach cramps.
It's possible to be intolerant to several different foods. This can make it difficult to identify which foods are causing the problem.
Food intolerances can also be difficult to tell apart from other digestive disorders that produce similar symptoms, such as inflammatory bowel disease, gastrointestinal obstructions or irritable bowel syndrome (IBS)
Lactose intolerance
Lactose intolerance, sometimes known as dairy intolerance, occurs when your body can't digest lactose. Lactose is in milk and dairy products such as yoghurts and soft cheeses.
The main symptoms are diarrhoea and stomach pain. In most cases, your GP can diagnose lactose intolerance by looking at your symptoms and medical history.
Could it be another type of food intolerance or condition?
Sometimes it isn't clear which food is causing a problem. The only reliable way of identifying such a food intolerance is through an exclusion diet, where you cut out certain foods from your diet one at a time to see if there's an effect.
Coeliac disease is a common digestive condition where a person has an adverse reaction to gluten. However, coeliac disease is not an allergy or an intolerance to gluten. It is an autoimmune condition where the immune system mistakes substances found inside gluten as a threat to the body and attacks them.
Gluten is a protein found in wheat, rye and barley that damages the intestine of people with coeliac disease. Symptoms include diarrhoea, bloating and weight loss. Coeliac disease can be accurately diagnosed with a blood test and biopsy.
About 1 in 100 people in the UK have coeliac disease, but it's estimated that around half a million aren't diagnosed.
Treatments for food allergy and food intolerance
- In all cases, always read food labels carefully, and learn where your problem food may be used as an ingredient in other foods.
- In the case of a food allergy, you'll have to avoid the food you're allergic to. You may be able to eat the cooked versions without any problems, as can be the case with fruit or vegetable allergies.
- With lactose intolerance, you'll have to reduce the amount of dairy food that you eat.
- With other forms of food intolerance, you'll have to stop eating the food for a while, or possibly for life.
With the autoimmune condition coeliac disease, you must avoid gluten for life.
For more advice on your diet, ask your GP to refer you to an NHS dietitian.
Pet allergens from the hairs of cats and dogs can inflame allergies. Children with pet allergies can miss out on visits to friends, sleepovers and parties where there are animals present.
Commenting on the impact of allergens on her 14-year-old son's life, Sarah Chapman said: "I have four children who would all love to have a dog. Unfortunately, due to my son's allergy to dogs, it's just not possible. I had to limit his visits to my mum's house (she used to own two dogs) just to keep his allergic reactions under control."
Dr Hicks has this advice for pet owners to reduce the spread of allergens in the home:
- Don't allow pets in bedrooms, and keep them out of the living room if possible.
- Wash your pets once or twice a week.
Indoor allergy hotspots
As well as pet allergens from cat and dog hair, the most common indoor allergens in UK homes are house dust mites and moulds.
House dust mite allergen is most associated with bedrooms, but it can settle on surfaces and spread around the house.
Allergens from outside such as pollen particles and pet hair can infiltrate the home through the air, especially during summer, and through open doors and windows.
But they also make their way inside by sticking to clothes, skin and hair. Once inside the home, they circulate in the air and settle on soft furnishings and hard surfaces. They may cause problems for anyone with hay fever.
Reducing indoor allergens
So, how can you reduce the allergens in your home? Dr Hicks recommends thorough and frequent cleaning, especially of the areas of the house you spend the most time in. Here are his tips:
To reduce house dust mites
- Damp dust the hard surfaces in your home. Don't forget places that gather dust and tend to get neglected, such as the top of picture frames, the backs of sinks, and so on.
- Vacuum carpets and hard floors daily if possible, and soft furnishings twice a week. Don't forget to vacuum under your bed (where the house dust mite allergen gathers).
- Use a barrier mattress cover on beds. They're also available for pillows and duvets.
- Vacuum your mattress and pillows and wash bedding and duvets above 55°C, or put bedding, duvets and soft toys into a plastic bag and put them in the freezer for 24 hours.
To reduce indoor pollen
- Keep pollen out of your home by keeping windows closed. Be aware that you can bring pollen in from outside if it sticks to your hair and clothes.
- Change your clothes the moment you get in, put them in a plastic bag until you can put them in the washing machine, have a shower and wash your hair.
- Wipe down pets when they come in the house after playing outside.
Get an eczema diagnosis
If you think your baby or child has eczema, see your GP to get a proper diagnosis and treatment. If necessary, your child may be referred to a dermatologist.
Don't try to treat eczema by yourself. Each case can need different treatment, which usually involves a combination of moisturisers (emollients) and steroid creams or ointments
If their skin becomes red and starts to seep liquid, it may be infected, in which case see your GP immediately for antibiotics
Give your child a bedtime routine
Children with eczema often find sleeping a problem, as their skin can get hotter and itchier at night. Keep their bedroom cool and use cotton sheets or a light, natural-fibre duvet.
Apply moisturiser at least 20 minutes before bedtime to allow it to soak in. Keep pets out of the bedroom, as dogs and cats can make eczema worse.
Avoid harsh soaps, shampoos and bath oils
Soap and bubble bath can make eczema far worse, as can washing your child too often.
Current advice says that you should wash a baby or young child once or twice a week (although the baby's face, hands and bottom should be cleaned daily).
Bathe your baby in warm – not hot – water, and stick to fragrance-free soaps, shampoo and bath oil. Your pharmacist or GP can advise you on what products to buy.
Use lots of moisturiser
Dry skin is more likely to flare up or become infected with a bacteria or virus. Use creams on your child as directed by your GP to make sure the skin affected by eczema is kept as soft and moist as possible. Avoiding harsh soaps that dry out the skin will also help.
Help your child to stop scratching
One of the biggest problems with childhood eczema is the urge to scratch the itchy skin, which may then bleed or become infected.
See if your child scratches at certain times of the day, for example while watching TV, and try to teach them to do something else instead, such as tightly holding their arm.
Praise them for not scratching, or even use a star chart. Keep their nails short. Cotton clothes rather than wool may lessen the itching.
Check your child's diet
Eczema usually starts when a baby is around six months old. In about 10% of cases it is triggered by foods, including milk, eggs, citrus fruit, chocolate, peanuts and colourings.
If you suspect a food is causing your child's eczema, it's important to seek advice from your GP before you cut out the food to make sure your child still gets a balanced diet