Eva Mendes has demanded the removal of harmful food dyes in popular children's cereals. The actress took to Instagram last week to warn about artificial dyes in Kellogg's cereals like Froot Loops. Dyes such as red 40 and yellow 5 have been banned in several European countries for their links to hyperactivity and cancer but continue to persist in US versions. The brand promised to remove artificial colors and ingredients from all of its cereals nearly a decade ago by 2018 but has yet to deliver on that promise. Mendes called on Kellogg's to remove these dyes and urged her social media followers to join a peaceful march to Kellogg's HQ. That protest took place Tuesday outside of the cereal giant's Michigan headquarters, where dozens of activists delivered a petition with nearly 400,000 signatures. On Instagram, Mendes wrote: “I grew up on cereal. I still love it but I won't eat @kelloggsus anymore after I found out that so many of the ingredients they use here in the US are BANNED in other countries. Why? Because they’re harmful for children.”