6. Certain artificial colors. Five artificial colors (red 40, blue 1, blue 2, yellow 5, and yellow) are either banned or require warning labels when used in other countries. The Center for Science in the Public Interest states that risks include hyperactivity in children, cancer (in animal studies), and allergic reactions. Until the 20th century, food coloring was obtained from natural sources. Today, most artificial colors are made from coal tar. Most processed foods contain coal tar in the form of artificial colors.
Where it’s banned: Norway and Austria.
