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What are possible differential diagnoses regarding food allergies?

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One possibility is the contamination of foods with microorganisms, such as bacteria, and their products, such as toxins. Contaminated meat sometimes mimics a food allergy when it is really a type of food poisoning.

There are also natural substances, such as histamine, that can occur in foods and stimulate a reaction similar to an allergic reaction. For example, histamine can reach high levels in cheese, some wines, and in certain kinds of fish, particularly tuna and mackerel. In fish, histamine is believed to stem from bacterial contamination, particularly in fish that hasn't been refrigerated properly. If someone eats one of these foods with a high level of histamine, that person may have a reaction that strongly resembles an allergic reaction to food. This reaction is called histamine toxicity.

From: Food Allergy and Food Intolerance WebMD Medical Reference

SOURCES:

The National Institute of Allergy and Infectious Diseases: "Fact Sheet: Food Allergy and Intolerances."  UpToDate. American Academy of Allergy Asthma & Immunology.

Reviewed by Brunilda Nazario on October 29, 2018

SOURCES:

The National Institute of Allergy and Infectious Diseases: "Fact Sheet: Food Allergy and Intolerances."  UpToDate. American Academy of Allergy Asthma & Immunology.

Reviewed by Brunilda Nazario on October 29, 2018

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What cause of food intolerance is often confused with food allergies?

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