A synthetic dye didn't become dangerous because it now carries a different chemical name on the label (Allura Red = Red 40, etc.) — same molecules as before. To meaningfully cut a sensitive child's exposure, the priority is reducing the overall load of brightly colored sodas and candy, not chasing every E-number.
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Two real facts get conflated here. Red No. 3 was indeed banned in the US in January 2025, but the FDA itself says the cancer signal is a rat-specific hormonal mechanism at doses ~210x human exposure, not replicated in other species or in humans — a legal ban (Delaney Clause), not proof of human risk at ordinary doses. The Southampton study (Lancet 2007), on the other hand, is the real (replicated) basis for the hyperactivity link: a randomized trial measured a small but significant effect on a composite score in general-population children, with UK reviewers noting the effect stays small against normal variation. The "same dye, different name" point is accurate (Allura Red AC = Red 40).
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