The U.S. seems to be a bit behind the times when it comes to artificial colors. Several European countries have already banned these artificial dyes, and others slap a warning label on packages containing them (while the U.S. is bringing back artificial dyes due to popular demand). Why? Leah told POPSUGAR this is because artificial dyes "have been linked to hyperactivity in children, ADHD, certain cancers, and some can even cross over the blood-brain barrier."
To easily avoid these dangerous dyes, if you see a color with a number next to it (like "Green 3" or "Yellow 5") or the words "artificial color" on an ingredient label, put that item back on the grocery shelf and quietly back away.