In our area, winter has passed by. Every year it gets warmer, so we are preparing for the appearance of thermophilic plants – date palm trees, for example. Why not.
But seriously, soon spring and allergy sufferers are interested in where to leave from flowering birch trees, hazel trees and other allergens.
The first thing that comes to mind – the United Arab Emirates, Tunisia, Egypt, Greece – and there is everywhere a date palm tree grows, and there is also an allergy to it.
Date palms belong to the family Palm (areca), which also includes: coconut palm, yellow dipsis, oil palm, yubeya (ivory palm), roystone, sabal, bismarck.
The pollen of plants of the palm family has a high cross-reaction. The main allergen in the pollen of palm trees is proteins – profiles.
Profilin proteins are not treated by the AIT method and are found in pollen of other trees, cereals, meadow and weeds: birch, olive, acacia, rye, timothy, and porcupine.
However, profile proteins are present not only in pollen, but also in vegetables, fruits, and nuts.
Profilin loses allergenicity during heat treatment, so allergy sufferers with a reaction to it can eat ready-made food without consequences.
The reason for the reaction to date pollen pollen is protein – profilin Pho d 2 (https://www.ncbi.nlm.nih.gov/pubmed/15784118).
In an allergic person with a reaction to proteins – profiling, a blooming date palm can cause tears, runny nose, coughing attacks and cause a reaction to profiling in other plants.
The pollen of the date palm is not very light, so the wind does not carry it over great distances, as is the case with pollen from other plants.
A true date palm pollen allergy can cause latex reactions.
In people with atopic dermatitis, date palm pollen can cause exacerbation of the skin condition.
Diagnosis of date pollen allergy
- ImmunoCap blood test for specific immunoglobulin E (Img E) date palm.
- Component allergy diagnostics (ImmunoCap method, AllergoExpert 300, ALEX).
Home Date Palm
But what about a room-date palm tree, which lovers of home greens like so much?
Palm trees rarely bloom under the roof, so pollen is not allergic. Danger is the land in the pot, where mold lives – one of the most severe allergens.
In addition, large palm leaves are an excellent dust collector, so you need to wipe the palm and it is better not to put it in a room where an allergic person sleeps.
Allergy to dates
The fruits of the date palm, dates in some parts of the globe are especially appreciated. On a diet of dates, a person can live several months and maintain the mineral and vitamin balance.
The reaction to dates can be either a true allergy or a pseudo-allergy. Symptoms of a pseudo-allergy are similar to manifestations of a true reaction, but a pseudo-allergy always depends on the amount of dates eaten.
An allergist will help distinguish pseudo-allergy from true.
Symptoms of an allergy to dates
- itchy skin
- nasal congestion
- discomfort and itching in the throat,
- stomach ache,
- nausea and vomiting,
- there are more serious reactions – bronchospasm, Quincke’s edema and anaphylaxis.
The reaction is not long in coming and appears in a few minutes, less often in a few hours or days.
Causes of an allergy to dates
Wash the dates thoroughly, and even better scald them with boiling water before eating. An allergy sufferer is better to start acquaintance with dates with a small piece. The most daring may ask an allergist to teach how to make a skin test at home.
Lipid Transfer Protein (LTP)
The main allergen in the date palm fruits is the lipid transfer protein (LTP). LTP can cause allergies on its own, and can provoke a cross-reaction with other proteins of the LTP group, which are found in pollen of plants, in many fruits (cherries, apples, apricots, peaches), dried fruits, nuts, both fresh and heat-treated.
LTP proteins are dangerous, their allergenicity does not decrease after heat treatment, and they often cause anaphylaxis and the so-called “Mediterranean syndrome” – a severe reaction to juicy fruits
Most often, a cross allergy to a date occurs in a person who is sensitive to pollen from acacia, timothy grass, rye and other cereal grasses. The culprits of these reactions, as a rule, are proteins – profiles.
To bring dates to Europa, the fruits are ripened unripe.
Unripe fruits contain mold spores, mainly Cladosporium and Aspergillus. But other types of mold can join in from improper storage and transportation.
Carriers, as a rule, do not save on preservative processing of dates; a guarantee of a good sale is a beautiful, contented date.
If the dates are not stored correctly, ticks will start.
Dates quickly absorb odors, so a jar with a tight lid is suitable.
In the refrigerator, on a shelf with zero temperature, the date feels good for about a year, in the freezer – 5 years. At room temperature, in a dark place, you can store dried or dried dates for about two months.
Dates are high in glucose. People with gastrointestinal diseases may experience diarrhea, pain, and bloating.
Dates are a common cause of a rash on the body.
Glucose, carbohydrates, lactose, fructose, maltose – can cause a sharp release of histamine in the skin and symptoms of a pseudo-allergic reaction.
But pseudo-allergy develops without the participation of the immune system (without Img e antibodies) and pseudo-allergy always depends on the amount of food eaten.
Allergists claim that there is no true allergy to glucose, fructose, lactose, maltose, since these carbohydrates are not recognized by the immune system.
Diagnosis of allergies to dates
The American Academy of Allergy, Asthma, and Immunology (AAAAI) states that any blood tests for antibodies – IgE, IgG – should not be evaluated without a clinical picture. The presence of antibodies to food is not a diagnosis yet.
Therefore, in allergology, symptoms are important, not the numbers in the test results.
Diagnostics methods for allergies to dates
- Food diary.
- Double prick test with a date. They conduct it like this: first they stick a sticker into the date, and then they make a “prik” on the skin.
- Blood ImmunoCap method for specific immunoglobulin to date (Img E).
- Component allergy diagnostics: ISAC allergy test, Allergoexpert 300, ALEX.
- Provocative tests (prohibited in Russia).
An immunoglobulin G test (Img G), as a marker of food allergy, is not considered reliable. The presence of Img G antibodies indicates that the body has already encountered this product.