What Causes a New Pineapple Allergy?

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Pineapple allergies are negative reactions to any part of the pineapple and to foods or supplements containing pineapple. An allergic reaction to pineapple can come on suddenly and may lead to rashes, itchy skin or diarrhea. Allergies can be triggered by eating pineapple or coming in contact with pineapple in any way. A new pineapple allergy may be triggered by overexposure to the fruit.

Eating pineapple may cause an allergic reaction.
Eating pineapple may cause an allergic reaction.

Immune Response

A pineapple allergy occurs when the body's immune system reacts to something in the pineapple that it considers harmful. The immune system produces both an antibody and histamine, a combination that can cause symptoms ranging from anaphylaxis to asthma, abdominal distress, eczema or headaches.

Eating pineapple could cause symptoms like asthma or eczema.
Eating pineapple could cause symptoms like asthma or eczema.

Excessive Exposure

According to the University of Maryland Medical Center, new allergies can develop from excessive exposure to a food. However, you cannot predict what amount of a substance will cause your system to reach that critical point at which it has been over-exposed to a food such as pineapple. When that happens, a new, unexpected allergic reaction might suddenly occur.

Excessive exposure may bring on an allergic reaction.
Excessive exposure may bring on an allergic reaction.

Genetic Sensitivity

Some individuals have a genetic sensitivity to allergens found in certain substances. If you have a family history of allergies, your risk escalates for suffering from food allergies.

Some individuals have a genetic sensitivity to allergens.
Some individuals have a genetic sensitivity to allergens.

Latex-fruit Syndrome

Researchers Brehler, Theissen, Mohr and Luger at the University of Münster, Germany, studied a condition called ”Latex-fruit syndrome," which revealed that cross-reactivity among latex, pineapple and other foods occurs “due to cross-reactive allergens.”

Scientists at the Guthrie Research Institute in Pennsylvania suggest that when tropical foods trigger Oral Allergy Syndrome, a latex allergy may be the source of the problem.

A latex allergy could actually be the underlying problem.
A latex allergy could actually be the underlying problem.

Oral Allergy Syndrome

Cross-reactivity between "airborne pollen proteins…with similar proteins that are found in various fresh fruits and vegetables,” including pineapple, can cause Oral Allergy Syndrome, which, according to Medicalnewstoday.com, may occur in 33 percent of individuals with seasonal allergies. Symptoms affect the mouth, tongue and throat and include itchiness, tingling and swelling immediately after eating fresh fruits or vegetables. Reactions may begin with one type of food, with others developing later. Many kinds of pollen, such as alder, birch, grass, mugwort and ragweed, cross-react with pineapple to cause Oral Allergy Syndrome, because exotic or tropical fruits such as banana and pineapple contain a protein called profilin that produces allergy-causing antibodies.

Tropical fruits may produce allergy-causing antibodies.
Tropical fruits may produce allergy-causing antibodies.

Reaction to Bromelain

Pineapples contain bromelain that, in addition to causing allergic reactions, may affect the blood's ability to clot. Certain people, including pregnant women and individuals with high blood pressure, hemophilia and liver or kidney disease should not consume bromelain and should probably avoid pineapple.

Pregnant women probably shouldn't consume pineapple.
Pregnant women probably shouldn't consume pineapple.

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