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How do doctors diagnose a food intolerance?

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Your doctor will ask about your medical history, the foods you eat, and your symptoms and may suggest some tests. You also may need to keep a detailed food and symptoms diary. Your doctor may suggest an exclusion diet: You'll stop eating foods that are the most common intolerance triggers. As these foods are slowly brought back into your eating plan, you and your doctor will keep track of your symptoms so you can see which foods or additives you're sensitive to.

SOURCES:

The British Allergy Foundation: "Identifying your Food Intolerances," "Sulphites and Airway Symptoms."

American Academy of Allergy Asthma and Immunology: "Food Allergy Overview," "Food Allergy."

Asthma and Allergy Foundation of America: "Food Intolerance."

Canadian Digestive Health Foundation: "Understanding FODMAPs."

Fedewa, A. and Rao, S.S.C, "Dietary fructose intolerance, fructan intolerance and FODMAPs."

Food and Drug Administration: "High Fructose Corn Syrup: Questions and Answers."

National Health Service (UK): "Diagnosing lactose intolerance."

National Institute of Allergy and Infectious Diseases: "Food Allergy: An Overview."

UpToDate: "Patient information: Food allergy symptoms and diagnosis (Beyond the Basics)."

University of Michigan Health System: "Hydrogen Breath Test."

Food Allergy Research & Education: "Facts and Statistics."

Reviewed by Carol DerSarkissian on June 18, 2018

SOURCES:

The British Allergy Foundation: "Identifying your Food Intolerances," "Sulphites and Airway Symptoms."

American Academy of Allergy Asthma and Immunology: "Food Allergy Overview," "Food Allergy."

Asthma and Allergy Foundation of America: "Food Intolerance."

Canadian Digestive Health Foundation: "Understanding FODMAPs."

Fedewa, A. and Rao, S.S.C, "Dietary fructose intolerance, fructan intolerance and FODMAPs."

Food and Drug Administration: "High Fructose Corn Syrup: Questions and Answers."

National Health Service (UK): "Diagnosing lactose intolerance."

National Institute of Allergy and Infectious Diseases: "Food Allergy: An Overview."

UpToDate: "Patient information: Food allergy symptoms and diagnosis (Beyond the Basics)."

University of Michigan Health System: "Hydrogen Breath Test."

Food Allergy Research & Education: "Facts and Statistics."

Reviewed by Carol DerSarkissian on June 18, 2018

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How can a hydrogen breath test help to diagnose a food intolerance?

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