What is a food allergy?

Reaction to a food. People can become allergic to many substances including certain foods. Some foods are more likely, such as milk, egg, wheat, soybean, shellfish, peanut, or nuts. Reactions can range from rash and itching to anaphylactic shock.
The body is confused. One way of looking at this is to remember the job of the immune system is to "fight off" foreign substances. With a food allergy, the body mistakenly thinks peanut or milk etc are foreign and reacts to try to protect the body.

Related Questions

What is a food allergy?

Immunologic response. A food allergy is a specific immunologic response that your body has to a food that can lead to various symptoms. This is different from a food intolerance, such as excess gas, nausea or diarrhea. Read more...
If you don't look... If you suspect specific foods that trigger itching, hives, throat swelling, intestinal cramping, diarrhea, dumping syndrome.And loss of consiousness by dropping you blood pressure you have a food allergy. This situation is very common and it would help to have allergy skin testing to figure out which ones they are. Read more...

What type of food allergy test is more accurate?

Scratch and patch. Scratch and patch testing are currently the gold standards for allergy testing. The results need to be correlated with symptoms and properly interpreted by a qualified physician. Read more...
Depends... For immediate, ige, mediated reactions, the gold standard is percutaneous (prick) skin testing. Serum rast testing which quantifies the amount of the ige is also useful but not as sensitive as percutaneous testing. Patch testing is reserved for specific conditions such as eosinophilic esophagitis and is used to detect delayed, cell-mediated food hypersensitivity. This test has a low sensitivity. Read more...
A food challenge. Although most food allergies are diagnosed by taking a good history of the reaction and performing an allergy skin test in the office, it is possible to have a positive skin test and but not be allergic to the food. The definitive evaluation of food allergy is by carefully administering small amounts of the food in an allergy office in a monitored setting. Read more...
Neither. Skin testing and blood test (serum specific ige) have different sensitivities and specificities. Either or both must be interpretted in light of the clinical picture. Frequently, patients with positive tests are not allergic and an oral challenge under the supervision of a board certified allergist familiar with oral challenges and treatment of anaphylaxis is needed. Read more...
Blood test. The skin test is more sensitive -- so there is less chance of you missing a real allergy. The blood test is more accurate, but it comes at a price of potentially missing a relevant allergy. Using both tests in combination with a clinical history will give you the best sensitivity and accuracy. Read more...
"double blind" Double blind challenge is most accurate = the gold standard. But skin testing is very accurate as well. Blood tests are helpful in some cases. Read more...

What does a food allergy from strawberries look like on legs?

Please see below. Strawberry allergy would usually occur within an hour or two every time you eat strawberry . You can have rash around the mouth or generalized hives, it would be very unusual to have rash on legs only. Read more...
Hives and swelling. Although strawberries are a fairly uncommon food allergen, the most likely reaction on the legs would be hives and swelling. Read more...

What type of food allergy shows as redness around the corners of the mouth? I have had this for years and recently went on a fast and it hasn't showed up yet, so I'm guessing it has to be a food allergy.

Would . Would see a doctor when this is present to determine if it is food related or due to a lack of something. Read more...
Sight . Sight unseen, from your description, it sounds like it may be angular chelitis. So many different causes, should be diagnosed and treated by a trusted health care professional near your area. Read more...

What are symptoms of food allergies in a child?

Many. They can range from a rash vomiting to an overwhelming shock and respiratory distress. Another words lowering of the blood pressure to a critical level and the inability to breathe normally. This is should be treated as an emergency. Read more...

Could you tell me what are some common food allergies?

Allergy/ intolerance. Top contenders include gluten, dairy, soy, corn, citrus, eggs, beef and peanuts. Processed foods and additives such as aspartame can also trigger reactions. In addition, your body needs beneficial bacteria (probiotics) that actually train the immune system how to respond to allergens. Sometimes people have more than 1 food allergy, so pay close attention. Good luck! Read more...
8 common. Although an allergy could be triggered by virtually any food, ‘‘major allergens’’ responsible for most significant reactions include milk, egg, peanut, tree nuts, shellfish, fish, wheat, and soy. Read more...

What's the difference between food allergy and food intolerance?

Mechanism. Food allergies are mediated by the ige antibody and it takes only a small amount to lead to a severe even anaphylactic allergic reaction and rarely death. Food intolerance is GI symptoms of bloating, gassy, crampy belly pain and diarrhea after eating usually larger amounts of a food. Intolerances are more common (like lactose intolerance) and are not mediated by ige antibody and not life ending. Read more...

What is the best food allergy test?

Best test food aller. There is no best test for food allergy in my humble opinion, and I am not an allergist.But having said that to diagnose food allergy, you need to take detailed history of suspected foods by parents keeping a food diary to narrow down the food which are symptomatic , skin testing and/or blood test to check the ige antibodies to those foods.Positive skin reaction or blood test alone is not good enough. Read more...
Skin Prick Testing. Food allergies are diagnosed first by getting a detailed clinical history of reaction. If history is concerning then skin prick testing and/or serum IgE testing to concerning foods will be drawn. Skin prick testing usually done first followed by serum testing to follow sensitivity over time. Prick to prick testing with actual food is also helpful to help clarify risk. See Allergist for details. Read more...