What Are Artificial Food Colorings?
Artificial food colorings are synthetic chemical dyes added to food and beverages to make them look more appealing. They have no nutritional value. They don't improve taste. Their sole purpose is to make food look better so you buy more of it.
The US currently permits nine synthetic color additives in food. Most are derived from petroleum — the same base material used to make gasoline, plastic, and asphalt.
These dyes are found in an astonishing range of products: candy, cereal, yogurt, sports drinks, salad dressings, pickles, bread, cheese, ice cream, medications, and even "healthy" snacks marketed to children.
The 7 Most Common Artificial Food Dyes
Red 40 (Allura Red AC)
Found in: Skittles, Doritos, Gatorade, strawberry-flavored yogurt, cough syrup, fruit snacks
Red 40 is the most widely used food dye in the United States. It accounts for roughly 40% of all food dye consumption.
Why it's controversial:
- A 2012 meta-analysis published in Neurotherapeutics found a statistically significant link between artificial food colorings and increased hyperactivity in children
- The European Union requires foods containing Red 40 to carry a warning label: "May have an adverse effect on activity and attention in children"
- California's Food Safety Act (2023) banned Red 40 from school foods starting in 2027
- Contains benzidine, a known carcinogen, as a low-level contaminant
Yellow 5 (Tartrazine)
Found in: Mountain Dew, Kraft Mac & Cheese (US version), Butterfinger, Peeps, instant pudding
Yellow 5 is the second most used food dye. It gives foods a bright lemon-yellow color.
Why it's controversial:
- One of the most common causes of dye-related allergic reactions, especially in people sensitive to aspirin
- Linked to hives, asthma symptoms, and skin reactions in sensitive individuals
- Banned in Norway and Austria
- EU requires the same warning label as Red 40
- The UK version of Kraft Mac & Cheese uses paprika and beta carotene for color instead
Yellow 6 (Sunset Yellow FCF)
Found in: Reese's Pieces, orange soda, Cheetos, nacho cheese, hot sauce, candy corn
Yellow 6 is used to create orange and warm yellow shades.
Why it's controversial:
- Has been shown to cause allergic-type reactions including hives, nasal congestion, and stomach distress
- Banned in Norway and Finland
- May contain cancer-causing contaminants including 4-aminobiphenyl and benzidine
- Like Red 40, requires a warning label in the EU
Blue 1 (Brilliant Blue FCF)
Found in: M&Ms, Jolly Ranchers, blue sports drinks, ice cream, frosting, canned peas (for color enhancement)
Blue 1 creates vivid blue and cyan shades.
Why it's controversial:
- Has been shown to cross the blood-brain barrier in animal studies
- Linked to chromosomal damage in some in-vitro studies
- Banned in Norway, Finland, and France (in some applications)
- Less studied than red and yellow dyes, which is itself a concern
Blue 2 (Indigotine)
Found in: Candy, pet food, beverages, baked goods
Blue 2 is a deeper, indigo-colored dye.
Why it's controversial:
- Animal studies have suggested links to brain tumors at high doses, though the FDA considers current levels safe
- Banned in Norway
Red 3 (Erythrosine)
Found in: Candy hearts, cake decorations, maraschino cherries, popsicles
Red 3 produces a bright cherry-pink color.
Why it's controversial:
- The FDA banned Red 3 from cosmetics in 1990 because it was shown to cause thyroid cancer in animal studies
- Despite this, it remained legal in food for over 30 years
- In January 2025, the FDA finally revoked authorization for Red 3 in food — manufacturers have until 2027 to reformulate
- The state of California banned Red 3 from food in 2023 via the California Food Safety Act
Green 3 (Fast Green FCF)
Found in: Canned peas, candy, desserts, beverages
Green 3 is one of the least used synthetic dyes.
Why it's controversial:
- Some animal studies have linked it to bladder tumors
- Banned in the European Union for most food applications
US vs Europe: A Tale of Two Standards
This is where it gets alarming. The exact same products are made with different ingredients depending on the country:
| Product | US Version | European Version |
|---|---|---|
| Fanta Orange | Red 40, Yellow 6 | Beta carotene, paprika extract |
| Kraft Mac & Cheese | Yellow 5, Yellow 6 | Paprika, beta carotene |
| Skittles | Red 40, Yellow 5, Yellow 6, Blue 1 | Natural plant and fruit extracts |
| M&Ms | Blue 1, Red 40, Yellow 5, Yellow 6 | Natural colorings in some markets |
| Nutri-Grain Bars | Red 40, Blue 1 | Beetroot red, paprika extract |
The food is the same. The brand is the same. The only difference is what regulators allow.
In Europe, foods with artificial dyes must carry a warning that says: "May have an adverse effect on activity and attention in children." In the US, no such warning exists.
What the Science Actually Says
The research on artificial food dyes falls into three main areas:
1. Hyperactivity in Children
The most robust evidence links artificial food dyes to behavioral changes in children. The landmark Southampton Study (2007), published in The Lancet, found that a mix of artificial colorings and sodium benzoate increased hyperactive behavior in both 3-year-olds and 8/9-year-olds — including children without ADHD.
This study directly led to the EU's mandatory warning labels.
2. Allergic Reactions
Yellow 5 (Tartrazine) is the most documented allergen among food dyes. Reactions include:
- Hives and skin rashes
- Asthma exacerbation
- Rhinitis (runny nose, sneezing)
- Rare cases of anaphylaxis
Roughly 0.01–0.1% of the general population may be sensitive, with rates higher among aspirin-sensitive individuals.
3. Cancer Risk
This is the most debated area. While individual dyes at FDA-approved levels haven't been definitively shown to cause cancer in humans, concerns remain:
- Several dyes contain low levels of known carcinogens (benzidine, 4-aminobiphenyl) as contaminants from manufacturing
- Red 3 was shown to cause thyroid tumors in rats — the basis for its ban from cosmetics and eventual food ban
- The Center for Science in the Public Interest has called for a ban on multiple dyes based on cumulative evidence
How to Avoid Artificial Food Dyes
Check the Ingredient List
All artificial colors must be listed by name (e.g., "Red 40" or "FD&C Red No. 40"). Look for them in the ingredient list, usually near the end.
Look for Warning Signs
Products that are unnaturally bright — neon-colored cereals, vivid candy, bright orange snacks — almost certainly contain synthetic dyes.
Choose Products With Natural Colorings
Look for these alternatives on labels:
- Beet juice / beetroot extract — for red
- Turmeric / curcumin — for yellow
- Paprika / annatto — for orange
- Spirulina — for blue/green
- Purple carrot / grape skin extract — for purple
- Caramel color — for brown (though this has its own concerns)
Or Just Scan It
Karrot AI instantly identifies every artificial food dye in any product. Point your camera at a label, and Karrot will flag every synthetic coloring, explain what it is, why it's concerning, and whether it's banned in other countries.
No chemistry degree required. No squinting at tiny ingredient lists in the grocery aisle.
What Parents Should Know
If you're buying food for children, artificial food dyes deserve extra scrutiny:
- Children consume more dyes per kilogram of body weight than adults
- The products with the highest dye concentrations are often marketed directly to kids — breakfast cereals, fruit snacks, candy, sports drinks
- The American Academy of Pediatrics published a policy statement in 2018 recommending that families "reduce exposure" to artificial food colorings
- An elimination diet removing artificial dyes has been shown to improve behavior in approximately 30% of children with ADHD, according to a meta-analysis in the Journal of the American Academy of Child and Adolescent Psychiatry
The Bottom Line
Artificial food dyes are cosmetic chemicals with zero nutritional benefit. They make food look more appealing, but the growing body of evidence — particularly around children's behavior and allergic reactions — suggests the trade-off isn't worth it.
The fact that major food companies already use natural alternatives in Europe proves that these dyes are unnecessary. They use synthetic dyes in the US because it's cheaper and regulations allow it.
Your best defense? Know what's in your food. Read labels, recognize the names, and use tools like Karrot AI to instantly decode any product.
Want to know if your food contains artificial dyes? Download Karrot AI and scan any product — it flags every synthetic coloring and tells you exactly what it means.
