Banana is a fruit consumed across the world. It is available at a cheap price in many countries. You may also like this fruit for its test. You may have experienced the cold cough after consuming bananas. The cause may be banana allergy.
Today we are going to discuss banana allergy in detail so that you can understand how it manifests and you can take measures to prevent banana allergies.
What is banana allergy?
Banana allergy is a type of food allergy. We have discussed food allergies in earlier posts, now we will discuss banana allergy here.
As everyone knows bananas are available across the world and we almost daily use it in each dish. It is a source of dietary fibres. Even the bananas are used as animal food.
In some people bananas may induce allergy. When they consume the food containing peanuts they may show allergic symptoms.
These allergic symptoms may range from mild to severe.
How common is banana allergy?
Banana allergy is not very common in the population. Less than 1 percent of total population show features of banana allergy.
Those who are allergic to bananas may show mild symptoms but very few people can show very severe symptoms too.
What are risk factors of banana allergy?
Risk factors are the factors which if present the banana allergy may occur more frequently. They are not the causative agents by their own but people with these factors are likely to suffer from banana allergy.
- History of eczema.
- If you are allergic to any other food or pollen or pea nuts.
- If you have any family member with similar type of allergy
Why does banana allergy occur?
As we have discussed earlier banana allergy occurs because of abnormal immune response to contents of banana. People around the world consume bananas. It is a very common product normally found in each household.
Like in any allergy if your immune system develops abnormal reaction to the proteins in banana it is called banana allergy.
Association with other food allergies
Most of the people who have banana allergy also show allergic symptoms when they are exposed to latex.
Latex is used in some medical and surgical disposable equipments like gloves and lids of injectable medicine containing vials.
Apart from latex people with banana allergy may be also allergic to:
What are the symptoms of the banana allergy?
The manifestations of the food allergy can be mild to moderate and have a variety of manifestations. The manifestations may depend upon the involving organ system.
So let us see how food allergy can manifest in your children or even in adults:
Early manifestations of banana allergy include symptoms of skin like pruritus that is itching of skin and redness and insect bite like macules on skin. There may be marks of excoriation if the patient has tried to scratch the area where symptoms come. Sometimes there may be an appearance of measles like rash on the skin. If it occurs repeatedly, the dry and hard scales may be developed on the skin.
Banana allergy may cause itching of eyes. The conjunctiva of the eyes may appear red. Eyes may have watery discharge or tears. The pupils and area around the eyes may swell in this condition. These manifestations may occur within a few hours of food intake.
Upper respiratory tract
Peanuts allergy may cause upper respiratory tract infections. They are stuffy or congested nose, running nose, sneezing, and itching sensations in nose and throat with throat pain, changed voice like hoarseness and dry cough. Extreme conditions like swelling of larynx which may block the windpipe that may be life threatening.
Lower respiratory tract
Banana allergy may cause lower respiratory tract symptoms like difficulty in breathing and wheezing that whistle like the sound a person breaths. Cough and feeling of tightness in chest. You may see skin between the ribs sagging in the chest when a person breaths. These symptoms are all similar to asthma. They can appear within a few minutes to hours after having food.
These symptoms may occur because of food allergy and they appear around or inside the mouth. They include itching and swelling of lips and palate, tongue. It may cause difficulty in eating breathing if the respiratory tract also is involved.
Other digestive tract manifestations
Feeling of nausea, abdominal pain and vomiting, diarrhea. In some children it may cause blood in stool which may be frightening for the parents. In some children there may be irritability and refusal to food and also after some days may cause loss of weight or failure to gain weight.
Cardiological (heart) manifestations
In some children food allergy may cause increased or decreased heart rate with decreased blood pressure. This decreased blood pressure may cause fainting and dizziness. This condition is called anaphylaxis. If not managed immediately may cause death.
What is prognosis of Banana allergy?
First time manifestations of the banana allergy can occur at any age and it may persist for many years.
Many of those who have allergy to banana may tolerate cooked bananas without any allergic symptoms as proteins and some allergy causing factors undergo change in process of cooking.
Usually other allergies resolve when the child grows but banana allergy is one of the food allergies that can continue for life. 20 percent of children who have banana allergy may continue to be so when they grow older.
Those who have banana allergy may also have allergies to avocado and kiwi and latex allergies.
How to prevent banana allergy?
Like any other food allergy banana allergy can be prevented by some measures that prevent food allergies.
Following are the simple ways which help to reduce the incidences of food allergies in children.
Breastfeeding is the best food for babies. We have already explained the benefits of breastfeeding in an earlier post. Exclusive breastfeeding for the first 6 months of the life protects infants and children from developing food allergies in future.
Complementary food should be started to infants at 6 months of age. Starting complementary food at 6 months of age after giving exclusive breastfeeding for the first 6 months of life reduces the chances of food allergy.
Introduce single food at a time
In complementary feeding infants should be introduced to single food at the time. Initially low risk food is introduced. Like if you are introducing rice, give the food made up of only rice for 4 days then introduce other pulses one by one.
High risk foods
Introduce potentially highly allergenic foods (fish, eggs, peanut products, milk, wheat) soon after the lower-risk foods (no need to avoid or delay)
Don’t avoid allergenic foods during pregnancy or nursing.
There is a myth that soy based formulas prevent allergic disease which is not true. Soy-based formulas do not prevent allergic disease.
How to diagnose Banana allergy?
Knowledge of the symptoms helps to diagnose the food allergy. A thorough history is needed to diagnose this condition.
The parent who daily feeds the child should accompany the child to the doctor to give the detailed history about diet and the symptoms.
Additionally you should carry the relevant medical history file if any to see the previous record of treatment and growth of the child.
History and physical examination
The goal of detailed history are to establish facts about:
The history can suggest the food which can provoke the allergic reaction and how much quantity of food was ingested before the symptoms.
The history about diet also helps to find out the interval between ingestion of the provoking food and appearance of the symptoms.
The history taking helps to find out the types of symptoms and their severity.
Whether there were similar episodes of symptoms with similar food in the past. How frequently it has occurred in the past.
Many times the history just gives a clue about allergy but cannot confirm the condition. In such cases we need to do some lab test to confirm or to refute the diagnosis.
Lab tests help to support the diagnosis and also help to find out allergy to other foods and other agents which may exist at the same time.
They help to guide the treatment and interventions needed to control the symptoms.
Lab tests can be used to identify provoking agents which can induce the symptoms in the patients. These lab tests mainly detect the IgE antibody mediated allergic reactions to the food.
Prick test is used to detect the allergy to specific food if known in history as a provoking agent.
The produce from the fresh fruits are useful for this test as readymade preparation may alter the antigens from the fruits.
In this test the fruit product is injected in a small amount on skin and the response is observed for a few minutes.
Negative test virtually excludes the possibility of the reactivity or allergy to that food.
Positive test does not indicate that the patient has a confirmed allergy to that food. The patients who test positive on tests may not be allergic to food when ingesting that food.
So rather than confirming, the prick test is for excluding the allergy to the food.
Further confirmation with specific IgE antibody tests is useful. Quantitative IgE levels are useful to detect the allergy.
Food elimination and challenge test
Above tests are not helpful for the cell mediated food allergies and other reactions. So eliminating a suspected group of food for a period and then introducing that food to see whether symptoms reappear is the only practical test to assess whether the patient is allergic to a food.
What is treatment for banana allergy?
Identifying and then eliminating the food to which a child is allergic is the only approach to treat the banana allergy.
Acute symptoms that occur after the consumption of bananas can be very mild in some cases. To some patients they can be very severe and life threatening.
If the symptoms are severe like anaphylaxis, the patient immediately needs epinephrine injection. Epinephrine is the only drug that reverses the allergy.
This is life saving medicine in case of anaphylaxis and it is given by injection. Epinephrine auto injector Epipen is useful for this purpose.
Antihistamines are antiallergic drugs. For mild allergic symptoms they can be given orally or by injection for severe symptoms. They reduce the symptoms of allergy in a few minutes.
Steroids are also antiallergic drugs. They are useful in allergies. In emergency doctors give that by injection or in other cases they give it orally.
Elimination of the food
Always read the contents of the food whether it contains bananas. Avoid food containing bananas if you are allergic to them.
This is a type of immunotherapy and can be useful to reduce the allergy to specific antigen by allergist.
Moreover most of the children with food allergy outgrow the condition in a few years so the child needs evaluation periodically.
Combination of oral immunotherapy with an anti IgE antibody like omalizumab seems promising in research.
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