Food allergies: Understanding food labels
Food labels list food allergens to help you avoid an allergic reaction. Here are the top eight food allergens listed.By Mayo Clinic Staff
In the United States, the Food and Drug Administration (FDA) requires food manufacturers to list the eight most common ingredients that trigger food allergies. Most other countries have similar rules. In the United States, information about food allergies has to be written in simple terms that adults and older children can understand.
The eight foods included in food allergy labeling account for an estimated 90 percent of allergic reactions. These eight foods are:
- Tree nuts (such as almonds, cashews, walnuts)
- Fish (such as bass, cod, flounder)
- Shellfish (such as crab, lobster, shrimp)
Understanding food labels
U.S. food labels take some of the guesswork out of label reading, helping you more easily identify foods that could cause an allergic reaction. Here are answers to a few common questions about food label requirements.
- What foods are labeled? Domestic or imported packaged food is required to have a label that lists whether the product contains one of the top eight allergens.
- What allergy information is included on the label? The label lists the type of allergen — for example, the type of tree nut (almond, walnut) or the type of crustacean shellfish (crab, shrimp) — as well as any ingredient that contains a protein from the eight major food allergens. The labels also include any allergens found in flavorings, colorings or other additives.
- What foods aren't labeled? Fresh produce, eggs, fresh meat and certain highly refined oils don't require listing on labels.
Food labeling laws require food allergens to be identified even in very small amounts — but only when they're contained as an ingredient. Manufacturers aren't required to include warnings about food allergens accidentally introduced during manufacturing or packaging (cross-contamination). This potentially can cause trouble if you're very sensitive to food allergens.
Many manufacturers voluntarily include warnings, but these advisory labels aren't always clear. And, manufacturers have different ways of saying a food allergen may be present. For example, labels may say "manufactured in a factory that also processes wheat" or "may contain soy."
The FDA is working to make the format of these advisory labels more consistent so that it's easier to identify which products contain allergens. When in doubt about whether a product contains something you're allergic to, it's best to avoid it until you check with your doctor.
Although gluten intolerance is different from a food allergy, it can cause serious health problems in people who have celiac disease, a chronic digestive disorder. Gluten is a protein that occurs in grains such as wheat, barley and rye. It's found in many foods and food ingredients.
The FDA has recently established guidelines for use of the term "gluten-free" on food labels. Any food product bearing a gluten-free claim must not contain an ingredient that is:
- A gluten-containing grain
- Derived from a gluten-containing grain that has not been processed to remove gluten
- Derived from a gluten-containing grain that has been processed to remove gluten, if the use of that ingredient results in the presence of 20 parts per million (ppm) or more gluten in the food.
Currently, the "gluten-free" label is voluntary — it's up to the manufacturer whether to include it. Many foods are naturally gluten-free and may or may not be labeled as such.
The bottom line: Be cautious
Always double-check labels to be sure you know what you're eating and drinking. Even though a food product may have been safe the last time you purchased or consumed it, it's possible that the ingredients have changed or the label has been updated. If you have any doubt about food ingredients, contact the manufacturer about whether the food possibly contains a food allergen.
Aug. 13, 2019
See more In-depth
- Guidelines for the diagnosis and management of food allergy in the United States: Summary for patients, families, and caregivers. National Institute of Allergy and Infectious Diseases. https://www.niaid.nih.gov/topics/foodallergy/clinical/Pages/default.aspx. Accessed Aug. 3, 2016.
- Food allergy. American College of Allergy, Asthma, and Immunology. http://acaai.org/allergies/types/food-allergies. Accessed Aug. 3, 2016.
- Food allergen labeling and consumer protection act of 2004. U.S. Food and Drug Administration. http://www.fda.gov/Food/GuidanceRegulation/GuidanceDocumentsRegulatoryInformation/Allergens/ucm106187.htm. Accessed Aug. 3, 2016.
- Have food allergies? Read the label. U.S. Food and Drug Administration. http://www.fda.gov/forconsumers/consumerupdates/ucm254504.htm. Accessed Aug. 3, 2016.
- Guidance for food industry: Questions and answers regarding food allergens, including Food Allergen Labeling and Consumer Protection Act of 2004 (edition 4); final guidance. U.S. Food and Drug Administration. http://www.fda.gov/food/guidanceregulation/guidancedocumentsregulatoryinformation/ucm059116.htm. Accessed Aug. 3, 2016.
- Questions and answers: Gluten-free food labeling final rule. U.S. Food and Drug Administration. http://www.fda.gov/Food/GuidanceRegulation/GuidanceDocumentsRegulatoryInformation/Allergens/ucm362880.htm. Accessed Aug. 3, 2016.