Allergic reactions to food: Manifestations, remedies, and origins
In the realm of food allergies, the immune system overreacts to certain proteins like they're hostile invaders. This reaction is quite common, affecting around 4% of adults and 5% of children in the United States. These numbers have seen a steady increase in recent years. For instance, the prevalence of peanut allergies among children has doubled over 10 years in North America.
Most food allergies crop up during childhood, but luckily, kids usually outgrow them, although there are exceptions. Food allergies can also emerge in adulternity, but that's less common. In this write-up, we'll delve into the symptoms, causes, triggers, and treatments of food allergies.
Symptoms of food allergy
Symptoms can vary greatly, affecting each person differently. Mild symptoms include tingling in the mouth, nausea or vomiting, diarrhea, and a runny or streaming nose. More severe symptoms include wheezing, facial swelling, hives, and even anaphylaxis.
Anaphylaxis
Anaphylaxis is a severe, systemic allergic reaction that usually manifests soon after exposure to the allergen but can sometimes take a few hours to develop. Symptoms often pop up quickly and worsen rapidly. They may include a rapid drop in blood pressure, fear, an itchy throat, nausea, respiratory problems, swelling, and loss of consciousness.
Common food allergy triggers
The "big eight allergens" account for most food allergies. These include: eggs, fish, milk, nuts, peanuts, shellfish, soybeans, and wheat. Children are most commonly allergic to milk, eggs, and peanuts, with up to 25% of them outgrowing a peanut allergy. European countries also commonly identify sesame, celery, lupin, and mustard as top allergens.
Diagnosing food allergies
Doctors will often ask about symptoms, the length of time it takes for a reaction to occur, the foods that cause it, whether the food was cooked, and where it was consumed. They'll also inquire about other allergies, especially seasonal allergies or asthma, as well as family history of allergies. For a diagnosis, they may use skin prick tests, blood tests, food diaries, or supervised oral food challenges.
Allergy vs. Intolerance
Many people who think they have a food allergy actually have a food intolerance, which is entirely different. While food allergies involve the immune system producing IgE antibodies and causing symptoms, food intolerances do not involve IgE antibodies and typically take longer to appear. They can stem from proteins, chemicals, or carbohydrates in foods, or a lack of enzymes or compromised intestinal permeability.
Causes of food allergies
In individuals with food allergies, their immune system perceives a specific protein in a food as a harmful substance, prompting it to produce IgE antibodies. These antibodies then trigger a cascade of chemicals that result in food allergy symptoms.
Risk factors and causes of increased food allergies
Anyone can develop food allergies, but certain factors do increase the likelihood. These include a family history of allergies, early life experiences, gut bacteria, and genetic factors. The reasons for the rising trend in food allergies are not entirely clear, but theories suggest diet, reduced antioxidant intake, lack of exposure to germs, and even low vitamin D intake as potential factors.
Treatments
Traditionally, managing food allergies has involved avoiding the allergenic food and treating symptoms as they arise. Oral immunotherapy, a relatively new approach, involves gradually introducing increasing amounts of an allergen to boost the threshold at which a reaction occurs. The FDA has approved a treatment for peanut allergy called Palforzia. Elimination of the allergen often requires more than just abstaining from the food; it may also involve avoiding touching or inhaling it, and cleaning kitchenware and surfaces thoroughly. People on an elimination diet may need to seek out alternative sources of essential nutrients like calcium and protein.
In emergencies, epinephrine (adrenaline) auto-injectors like EpiPen are crucial. Medications like antihistamines can also be used to alleviate mild or moderate symptoms.
In conclusion, food allergies are pretty common in the U.S., and rates are on the rise. While childhood is the peak period for allergies, many children outgrow them. Common allergens include the "big eight" mentioned above, and symptoms can range from mild to severe, potentially leading to anaphylaxis if left untreated. Traditional management involves avoiding the allergen and treating symptoms, but new approaches like oral immunotherapy offer hope for a more comprehensive solution. Always carry an epinephrine auto-injector and seek immediate medical attention if severe symptoms arise.
- Immunotherapy, specifically oral immunotherapy, is a relatively new approach to treat food allergies, contributing to a more comprehensive solution.
- The FDA has approved a treatment for peanut allergy called Palforzia, which involves gradually introducing increasing amounts of peanut to boost the threshold at which a reaction occurs.
- In addition to abstaining from allergenic food, elimination diets may require individuals to seek out alternative sources of essential nutrients like calcium and protein.
- Epinephrine auto-injectors like EpiPen are crucial in emergencies for treating severe symptoms of food allergies.
- Food allergies can stem from various causes, including a family history of allergies, early life experiences, and genetic factors.
- The prevalence of food allergies is on the rise, and theories suggest diet, reduced antioxidant intake, lack of exposure to germs, and low vitamin D intake as potential factors.
- Symptoms of food allergies can vary greatly, with mild symptoms including tingling in the mouth, nausea or vomiting, diarrhea, and a runny or streaming nose. More severe symptoms include wheezing, facial swelling, hives, and even anaphylaxis.
- In individuals with food allergies, the immune system perceives a specific protein in a food as a harmful substance, prompting it to produce IgE antibodies and causing symptoms.
- European countries commonly identify sesame, celery, lupin, and mustard as top allergens, in addition to the "big eight" allergens (eggs, fish, milk, nuts, peanuts, shellfish, soybeans, and wheat).
- People with food allergies often need to adopt a health-and-wellness lifestyle that includes fitness-and-exercise, nutrition, and lifestyle changes to manage their allergies and maintain overall health, such as avoiding touch or inhalation of allergens and cleaning kitchenware and surfaces thoroughly.
