Artificial (synthetic) food dyes are petroleum-based chemicals added to foods solely to make them more colorful — they add no flavor, no preservation, no nutrition. The common ones on US labels are Red No. 40, Yellow No. 5, Yellow No. 6, and Blue No. 1, and they show up in candy, fruit-flavored drinks, cereals, chips, frosting, and countless packaged snacks marketed straight at children.

This is the part with better evidence than most people on either side of the fight realize. Four findings, in descending order of fame:

1. The randomized trial. The landmark Southampton trial, published in The Lancet, tested artificial dye mixtures (with the preservative sodium benzoate) in over 250 children aged 3 and 8–9 from the general population — randomized, double-blinded, placebo-controlled. The additives increased hyperactive behavior — inattention, impulsivity, overactivity — in both age groups, and not only in children with a behavioral diagnosis (McCann et al., The Lancet, 2007).

2. The systematic review. California’s Office of Environmental Health Hazard Assessment reviewed 27 clinical trials: 64% of challenge studies showed evidence of a link between synthetic dyes and adverse behavioral outcomes in children, with 52% reaching statistical significance. The review concluded that current FDA “acceptable daily intakes” may not adequately protect children’s developing brains (Miller et al., Environmental Health, 2022).

3. The meta-analysis. Pooled double-blind, placebo-controlled trials found a small-to-moderate effect (0.21–0.44 on parent ratings) of removing artificial colors on hyperactive behavior — consistent with a sensitive subgroup of children (Pelsser et al., PLoS ONE, 2017).

4. The pediatricians’ verdict. The American Academy of Pediatrics’ 2018 policy statement named artificial food colorings among the food additives of greatest concern for child health — noting children are more vulnerable than adults because they eat more relative to their body size and their organ systems are still developing. The AAP recommended families reduce exposure and called on the FDA to strengthen its review process (Trasande et al., Pediatrics, 2018).

Put together: artificial dyes can worsen inattention, impulsivity, and hyperactivity in some children — including children without ADHD. The effect varies child to child, which is exactly why the internet can’t agree: both the “it transformed my kid” parent and the “we never noticed anything” parent can be telling the truth. Reducing exposure is a low-risk step that may genuinely help — and that’s the calibrated claim the evidence supports, no more, no less.

Ultra-processed foods are industrial formulations made mostly from substances extracted from foods — oils, starches, sugars — or created in labs, like flavor enhancers, emulsifiers, and artificial colors. Think packaged snack cakes, chips, candy, sugary cereals, frozen pizza, hot dogs, soda, and fruit-flavored drinks. The dyes are usually just the most visible passenger in that vehicle.

And the vehicle is doing most of the driving in kids’ diets: a nationally representative analysis of over 33,000 US children and teens found ultra-processed foods now make up about 67% of what American youth eat each day — up from 61% in 1999 — while whole and minimally processed foods fell from 29% to 24% (Wang et al., JAMA, 2021). Two-thirds of childhood eating, from the factory.

Here’s where I put on my evidence-grading hat, because the strength of these findings varies — and saying so is the difference between science and a scare.

• Strongest-grade (“convincing”) evidence: a BMJ umbrella review pooling 45 meta-analyses covering nearly 10 million people linked higher ultra-processed intake to a 50% higher risk of cardiovascular disease–related death and a 12% higher risk of type 2 diabetes per serving increment — plus a 48% higher risk of anxiety and 53% higher risk of common mental health disorders (Lane et al., BMJ, 2024).

• It starts young: in a study of over 1,400 preschoolers aged 3–6, children in the highest third of ultra-processed intake already showed higher fasting blood sugar and lower “good” (HDL) cholesterol than the lowest third — and replacing just 100 grams a day with whole foods was associated with measurable improvement (Khoury et al., JAMA Network Open, 2024).

• Suggestive (not settled) evidence: links to depression and sleep problems — real signals worth watching, graded honestly as not yet conclusive (Lane et al., 2024).

Notice what the preschool study implies: this isn’t about someday. Blood sugar regulation and cholesterol patterns are already responding to snack choices before kindergarten — and responding again, in the right direction, when whole foods take over even modestly.

The everyday-exposure plan

• At the store: scan ingredient lists for Red 40, Yellow 5, Yellow 6, Blue 1, or “artificial color,” and favor snacks with short, recognizable ingredient lists. Whole foods first: fruits, vegetables, whole grains, beans, nuts, eggs, plain dairy, and whatever proteins your family eats.

• In the cup: water and plain milk as defaults; 100% juice capped at 4–6 oz a day for young kids; fruit-flavored drinks and soda off the everyday roster.

• At home: simple beats packaged — scrambled eggs, oatmeal, rice and beans are quiet nutritional overachievers. Fruit (fresh, frozen, or canned in water or juice) covers dessert most nights.

• At school and parties: ask about dye-free snack options at school if you’re inclined — and then let party treats be party treats. The target is everyday exposure, not perfection.

• If behavior or attention is a concern: try removing artificial dyes for 2–4 weeks and watch what happens. It’s safe and free — and worth discussing with your pediatrician either way.

Full disclosure on my own stake here — and this one is personal. The AAP’s 2018 food additives statement cited above isn’t just a reference on this blog; it’s the paper that validated my kids’ grandmother, who had quietly insisted on keeping plastic away from her grandchildren’s food years earlier on pure intuition. That statement — covering both the additives put into food and the ones that migrate in from food-contact materials — is why I founded Ahimsa and why our children’s dishware is stainless steel. Grandma was peer-reviewed eventually.

• Randomized-trial evidence shows artificial dye mixtures can increase hyperactive behavior in some children — not just those with ADHD — and the AAP has recommended reducing exposure since 2018.

• Sensitivity varies by child, which is why parent experiences differ so loudly online — both sides can be right.

• Ultra-processed foods now make up about 67% of US kids’ daily intake; the strongest-grade evidence ties them to cardiovascular, metabolic, and mental health risks.

• Blood sugar and cholesterol patterns respond to snack quality as early as preschool — in both directions.

• Added sugar ceiling: 25 g/day over age 2, none under 2; one soda blows the whole budget.

• The plan is proportion, not purity: whole-food everyday snacks, label literacy, a 2–4 week dye-free trial if behavior is a question — and cake at the party.

Sources & further reading

1. McCann D, Barrett A, Cooper A, et al. Food Additives and Hyperactive Behaviour in 3-Year-Old and 8/9-Year-Old Children in the Community: A Randomised, Double-Blinded, Placebo-Controlled Trial. The Lancet. 2007;370(9598):1560–1567. [Add DOI]

2. Miller MD, Steinmaus C, Golub MS, et al. Potential Impacts of Synthetic Food Dyes on Activity and Attention in Children: A Review of the Human and Animal Evidence. Environmental Health. 2022;21:45. [Add DOI]

3. Trasande L, Shaffer RM, Sathyanarayana S; AAP Council on Environmental Health. Food Additives and Child Health (Policy Statement). Pediatrics. 2018;142(2):e20181408. [Add DOI]

4. Pelsser LM, Frankena K, Toorman J, Rodrigues Pereira R. Diet and ADHD, Reviewing the Evidence: A Systematic Review of Meta-Analyses of Double-Blind Placebo-Controlled Trials Evaluating the Efficacy of Diet Interventions on the Behavior of Children With ADHD. PLoS ONE. 2017;12(1):e0169277. [Add DOI]

5. Wang L, Martinez Steele E, Du M, et al. Trends in Consumption of Ultraprocessed Foods Among US Youths Aged 2–19 Years, 1999–2018. JAMA. 2021;326(6):519–530. [Add DOI]

6. Lane MM, Gamage E, Du S, et al. Ultra-Processed Food Exposure and Adverse Health Outcomes: Umbrella Review of Epidemiological Meta-Analyses. BMJ. 2024;384:e077310. [Add DOI]

7. Khoury N, Martínez MÁ, Garcidueñas-Fimbres TE, et al. Ultraprocessed Food Consumption and Cardiometabolic Risk Factors in Children. JAMA Network Open. 2024;7(5):e2410176. [Add DOI]

8. Vos MB, Kaar JL, Welsh JA, et al. Added Sugars and Cardiovascular Disease Risk in Children: A Scientific Statement From the American Heart Association. Circulation. 2017;135(19):e1017–e1034. [Add DOI]

Medical Disclaimer

Educational content only: This article is for general education to help you have informed conversations with your child’s pediatrician. It is not medical advice, diagnosis, or treatment. Every child is different, and your own doctor — who knows your child — should guide decisions about their care, including any concerns about your child’s eating, growth, or food allergies.

About the Author

Dr. Manasa Mantravadi is a board-certified pediatrician, culinary medicine specialist, and founder of Ahimsa, the first pediatrician-designed stainless steel children's dishware brand. Raising three kids and being a pediatrician has taught her that food is love, food is health, and food is joy.