That last one mentioned coloring agents multiple times. Different research has show artificial colors, as derived from petro-chemical processing like reds and yellows, are strongly linked with neurotransmitter disruption in all people, but the effect is an order of magnitude more significant in high risk children.
2) Serotonin and ADHD - https://pubmed.ncbi.nlm.nih.gov/25684070/
3) Dopamine cycle explained in context of ADHD - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2626918/
4) ADHD and sugar explained - https://www.verywellmind.com/the-sugar-and-adhd-relationship...
5) ADHD and sugar study - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3133757/
That last one mentioned coloring agents multiple times. Different research has show artificial colors, as derived from petro-chemical processing like reds and yellows, are strongly linked with neurotransmitter disruption in all people, but the effect is an order of magnitude more significant in high risk children.