Food allergy occurs, when the body immune system sees    certain foods as harmful, thereby causing an unpleasant    reaction. Food allergies can cause serious and deadly reactions    in kids, if not properly handled. Dr. Oluwafunmilayo Funke    Adeniyi, a paediatrician in the Department of Paediatrics,    Lagos University Teaching Hospital (LUTH) discussed food    allergies in children, what triggers it and how to reduce the    risk of kids developing it. GERALDINE AKUTU reports.  
    What is food allergy?    Food allergy is a clinical condition, where the body makes    antibodies (Immunoglobulin E (IgE)) to a specific food. The job    of the bodys immune system is to identify and destroy germs,    such as bacteria or viruses that make you sick. A food allergy    results, when the immune system mistakenly targets a harmless    food protein  an allergen  as a threat and attacks it.    Initial exposure to the food may not produce severe reaction,    but the child may become sensitised and when the food is next    eaten (or sometimes just comes in contact with the skin), it    triggers an immune system response, which results in the    release of histamine and other substances in the body. These    cause various symptoms, depending on where in the body they are    released.  
    Signs and Symptoms of Food allergy    The following are the signs and symptoms of food allergy    regardless of the allergen:    Skin system: swelling, itching, warmth, redness and rashes.  
    Respiratory system (breathing): coughing, wheezing, shortness    of breath, chest pain/tightness, throat tightness, hoarse    voice, nasal congestion or hay fever-like symptoms (runny itchy    nose, watery eyes and sneezing), difficulty in swallowing.  
    Gastrointestinal system (stomach): nausea, pain/cramps,    vomiting, diarrhoea and some children may actually pass blood    in the stools.  
    Cardiovascular system (heart): pale/blue colour, weak pulse,    passing out, dizzy/lightheaded, and shock. Others: older    children may describe anxiety, feeling of impending doom,    headache, and metallic taste. The most dangerous symptoms of an    allergic reaction, which is usually referred to as anaphylaxis    are:  
     Difficulty with breathing caused by swelling of the airways,    including a severe asthma attack for people, who have    asthma.     Drop in blood pressure, causing dizziness, light-headedness,    feeling faint or weak, or passing out. Both can lead to death,    if untreated.  
    Having said this, it is important to note the symptoms of    classic allergy, which are rashes, wheezing, itching, severe    gut symptoms and very rarely, sudden collapse i.e. anaphylaxis.  
    How long does it take to have allergy in    children?    An allergic reaction usually happens within minutes after    exposure to an allergen, but sometimes it can take place    several hours after exposure to the allergen. In children with    the immune mediated or IgE mediated food, allergy symptoms    occur within minutes up to two hours after ingestion of the    food. These symptoms usually recur on exposure to the food on    every occasion and may be mild or severe, associated with    anaphylaxis. The symptoms of classic allergy, as such, are    rashes, wheezing, itching, severe gut symptoms or (very rarely)    sudden collapse.  
    What are the most common food allergies in    children?    Allergy can occur to a single food or to many foods. Allergy to    many foods is a more severe form of allergy, and is referred to    as multiple food allergies.    The common allergenic foods i.e. food that induce allergies,    include cows milk, dairy products, egg, seafood (fish and    shrimps), wheat, soy and peanuts. The commonest food allergy in    children is cows milk.  
    Is there a cure for food allergy?    There is no direct cure for food allergy. The condition is best    managed with elimination diet i.e. avoidance or exclusion of    the offending food from the diet and subsequent substitution.    For example, in a child with cows milk protein allergy, the    milk should be removed from the childs diet and a substitute    in the form of soya milk, or hydrolysed formula (i.e. milk that    the protein has been broken down to peptides) or amino acid    formula, which can readily be digested and does not cause    reactions in the child.  
    When the child is up to six months and weaning is commenced,    solids should be introduced gradually and one food at a time.    This should be from the least allergenic foods, i.e. cereals,    then vegetables and fruits, then chicken, eggs, fish and lastly    nuts.  
    How can parents handle their childrens food    allergies?    If a severe allergy has been identified in a child, it is    important the parents ensure that the child avoid even the    tiniest amounts of the trigger food. Very occasionally,    reactions can occur, even when the child has had skin contact    with the offending food. A fish-allergic person may react by    being in a kitchen, where fish is being cooked. The parents    should do gradual introduction of the allergenic foods in    infancy, as described earlier.  
    Children, parents and caregivers should be educated on common    ingredients, reading food labels and how to safely avoid    allergens. Children and parents should also be aware of    appropriate, safe, cost-effective, freely available and    nutritionally adequate substitutes for the avoided foods.  
    As well as avoiding the offending food, the allergic child    should be provided with appropriate emergency treatment, should    accidental exposure occur. Depending on the severity of the    reaction, this may be adrenaline to be given by injection,    antihistamines, steroids, or all of these. The exact details of    such treatment will need to be decided by the doctor in charge    of the child. The parents should ensure that an allergy    specialist or dietician, who is experienced in food allergies    and paediatric gastroenterologist, sees the child regularly.  
    Children affected by severe food allergy can still participate    in all normal activities, school, work or leisure, but the    parents should give appropriate support and understanding.  
    Can a child outgrow food allergies?    Usually, children who have cows milk allergy become tolerant    of cows milk, as they grow older and outgrow their allergy by    the age of two to three years. Children are usually    re-evaluated at regular intervals to see if they have developed    tolerance. Generally, younger children with milk, soya and egg    allergy are reviewed every six to 12 months and older children    every one to two years. Tree nut, fish and shellfish allergy    may be life long, but re-evaluation should be performed every    two to four years to determine whether re-challenges are    appropriate or exclusion needs to be continued.  
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What to know about food allergies in children - Guardian (blog)