I participated in some consumer testing when Kellogg's Canada was switching their breakfast cereals to natural colours. Beyond some muted colours, the cereal tasted exactly the same. Seemed like a no brainer, really.
The US parent company is also committing to it as well.
https://www.wkkellogg.com/our-impact/make-eating-well-easy/q...
https://www.fooddive.com/news/silly-general-mills-artificial...
I'm curious (as in HN curious discussion) whether this points to something greater about US culture.