Understanding Food Dye Allergies

• Food colorings are typically safe for consumption, but a subset of people may react to dyes like carmine, Red 40, or Yellow 5 and develop an intolerance or allergic response.
• Allergic responses to food dyes range from mild to life-threatening. Mild reactions may include hives, facial flushing, or itching. Severe responses can produce swelling of the face or lips, chest tightness, or breathing difficulties. Call 911 immediately for severe symptoms.
• If you’re allergic to a dye, carefully review ingredient labels on foods and medicines. When in doubt about whether a product contains a problematic dye, opt for an alternative or avoid it altogether.

Have you ever felt unwell after eating particular foods? Some diets contain components that don’t agree with everyone. These can include lactose, wheat, and soy, as well as additives like monosodium glutamate (MSG) and artificial colorings.

If eating certain items provokes a physical reaction, you might have either an intolerance or an allergy to those ingredients.

Food intolerance means your body struggles to properly digest the substance or you’re sensitive to it, while a food allergy involves an immune response that can be serious.

The Food and Drug Administration (FDA) oversees the safety of food additives, including colorants. Still, individuals vary in sensitivity, and although dye allergies are uncommon, they do occur.

If you suspect you’re reacting to a specific dye, here’s how to recognize symptoms and steer clear of products that contain it.

Food dyes that can cause allergies

Allergies to food dyes are uncommon overall; experts estimate only a small portion of the population is affected. Food additives may be derived from natural sources or synthetically produced.

Research has associated certain dyes with allergic reactions, including the following:

Carmine

Carmine, also called cochineal extract or natural red 4, is derived from dried insects and has been used as a colorant since the 16th century. It’s also present in many cosmetic items.

Studies have documented a range of reactions such as:

• skin redness or discoloration
• swelling and rashes
• atopic eczema
• gastrointestinal complaints
• wheezing, coughing, and other respiratory symptoms

Carmine has also been implicated in some unexplained anaphylactic shock cases.

Natural red 4 may be present in:

• burgers and sausages
• beverages
• confectionery
• fruit yogurt

Red 40

Red 40, or Allura Red, is the most frequently used red dye in food and other products. It’s produced from petroleum distillates or coal tar byproducts. Even foods that aren’t visibly red can contain Red 40, and the FDA requires it to be listed by name on labels.

Some individuals experience allergy-like symptoms from Red 40, including hives and facial swelling. The FDA has noted concerns about this dye but concluded the data were inconsistent and not robust enough to show clear harm.

Red 40 can appear in:

• cereals
• drinks
• cosmetics
• candies
• fruit snacks

Yellow 5

Yellow 5, known as tartrazine, is one of several yellow food dyes linked to allergic responses. People have reported hives and swelling after consuming products with Yellow 5.

Older research suggested tartrazine might provoke asthma attacks in children, though a 2010 study did not confirm the same findings.

Yellow 5 is commonly found in:

• candy
• canned vegetables
• cheese
• beverages
• ice cream
• ketchup
• salad dressings
• hot dogs

Yellow 6

Also called Sunset Yellow, Yellow 6 is another widely used dye. Reports of hypersensitivity to Yellow 6 date back decades, and there have been instances linking it to anaphylactic reactions, stomach cramps, skin lesions, and hives.

Yellow 6 appears in:

• cereals
• medications
• gelatin
• candies
• sausages
• cosmetics
• bakery items

Annatto

Annatto is a yellow-orange dye obtained from the seeds of the achiote tree, native to tropical regions. It imparts a yellow-orange hue to foods and has been associated with mild skin reactions in some people.

Older studies reported severe, anaphylactic responses in individuals sensitive to annatto.

Annatto may be present in:

• cereals
• cheeses
• beverages
• snack foods

Blue 1

Blue 1, or Brilliant Blue, is the more commonly used of the two FDA-approved blue dyes and one of the longest-approved colorants. Some studies have suggested potential neurotoxic effects in fetuses and young children, meaning possible harm to the nervous system.

Blue 1 can be found in:

• beverages
• cereals
• candies
• medications
• cosmetics (not for use in the eye area)

Signs you’re having an allergic reaction

Reactions to food dyes can be mild or severe. Mild symptoms may include:

• facial flushing
• headaches
• hives
• itchy skin

Severe symptoms can involve:

• facial or lip swelling
• chest tightness
• difficulty breathing or wheezing
• dizziness or fainting
• rapid heartbeat
• low blood pressure
• a sensation of throat constriction
• trouble breathing

Call 911 right away if you develop severe symptoms, as this reaction can be life-threatening.

If you have a known severe dye allergy, keep an epinephrine auto-injector with you at all times. An auto-injector is the primary emergency treatment for a severe allergic reaction.

Allergy testing

For most food allergies, doctors use blood tests or skin prick tests to identify the trigger. Currently, there are no specific tests to diagnose a colorant allergy. Often, the offending ingredient must be identified through trial and error.

One strategy is to keep a detailed food diary, recording everything you eat and noting when symptoms occur, then avoiding suspected foods for several weeks to see if symptoms resolve.

Another method is an oral food challenge conducted under medical supervision. During this test, your clinician gives you a series of foods—one or more may contain the suspected dye—without telling you which. A reaction during the challenge helps pinpoint the culprit.

Avoiding food dyes

The most effective way to prevent an allergic episode is to avoid foods that contain the allergen. In practice, total avoidance can be challenging because dyes may appear in unexpected products, including some medications and supplements.

You may need to become diligent about reading ingredient lists for every product you buy. If you’re uncertain whether a particular food or medicine contains the dye in question, contact the manufacturer to ask, choose an alternative, or avoid the product entirely. For guidance on caring for children who are unwell and what they can eat, see food for sick kids.