Food Dyes and Children: What Parents Need to Know

The McCann study: the research that changed regulations

In September 2007, researchers led by Jim McCann at the University of Southampton published a randomized, double-blind, placebo-controlled trial in The Lancet. The study gave children aged 3 and 8-9 either a mixture of artificial food colors plus sodium benzoate (a common preservative) or a placebo drink, then measured hyperactivity using standardized assessments.

The dye mixture included: Sunset Yellow (Yellow 6), Carmoisine, Tartrazine (Yellow 5), Ponceau 4R, Quinoline Yellow, and Allura Red (Red 40). The study found statistically significant increases in hyperactivity in both age groups after consuming the mixture — not just in children diagnosed with ADHD, but in the general population of children tested.

The UK Food Standards Agency reviewed the findings and recommended that manufacturers voluntarily remove the "Southampton Six" dyes from their products. Most UK manufacturers complied. When the European Commission acted, it required mandatory warning labels on products containing any of these dyes across all EU member states — a requirement still in force today.

The FDA's advisory committee review

Following the McCann study, the FDA convened an advisory committee in March 2011 to review the evidence on food dyes and children's behavior. The committee's conclusion was more cautious than the EU's regulatory response: the FDA found that the evidence did not establish a causal link sufficient to require warning labels or bans, but acknowledged that a subset of children — particularly those with ADHD — may be sensitive to synthetic dyes.

The FDA committee vote was not unanimous. Several members wanted stronger action, citing the precautionary principle. The majority position was that the evidence showed an association in sensitive children but was not strong enough to conclude that dyes cause hyperactivity in the general pediatric population. No regulatory action resulted from the 2011 review.

In 2025, the FDA changed course significantly. Citing accumulating evidence and an administration push to review synthetic additives, the FDA announced it would phase out six petroleum-derived synthetic dyes from the food supply by the end of 2027 and would work with manufacturers to transition to natural alternatives. Red Dye 3 had already been banned separately in January 2025 due to a different concern — thyroid tumors in high-dose rat studies.

California's Food Safety Act and warning labels

California passed the California Food Safety Act (AB 418) in 2023, which originally included provisions targeting certain food dyes. A subsequent law, the School Food Safety Act (AB 2316, signed 2024), specifically prohibited the sale of food containing six synthetic dyes — Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2, and Green 3 — in California public school cafeterias starting December 31, 2027.

Earlier California legislation required warning labels on products containing these dyes intended for children. The trajectory in California mirrors what the EU did over a decade earlier: warning labels first, then restrictions in children's settings.

The science: what the evidence actually supports

The current state of evidence, as summarized by a 2012 meta-analysis in the Journal of the American Academy of Child and Adolescent Psychiatry (Nigg et al.), found a small but statistically significant relationship between artificial food color consumption and increased ADHD symptoms in children. The effect size was small — comparable to lead exposure effects at low doses — but consistent across studies.

Key caveats: the research does not establish that dyes cause ADHD. Children with existing ADHD or behavioral sensitivities appear more affected than neurotypical children. The effect is behavioral (hyperactivity, inattention) rather than structural — no studies show dyes alter brain development or cause lasting changes in neurological function. Most studied children showed no measurable effect.

Separately, several synthetic dyes have raised concerns unrelated to behavior. Yellow 5 (Tartrazine) is associated with allergic reactions, particularly in aspirin-sensitive individuals. Red 40 is under EFSA genotoxicity review as of 2024. These are distinct safety questions from the hyperactivity research.

Where are these dyes found?

Synthetic food dyes are concentrated in products marketed heavily to children. The highest-exposure categories include:

• Candy and gummies — Skittles, gummy bears, M&Ms, Starbursts
• Breakfast cereals — Froot Loops, Cap'n Crunch, Lucky Charms
• Sports and fruit drinks — Gatorade, Kool-Aid, Capri Sun (some varieties)
• Snack foods — Doritos, Cheetos, flavored crackers
• Frosted baked goods — Pop-Tarts, cupcakes with colored frosting, decorated cookies
• Frozen treats — Popsicles, sherbet, flavored ice cream