Are synthetic food dyes bad for you? Here's the science.

Grocery store shelves, filled with colorful cereals, like Raisin Bran, Apple Jacks, Pops, and Froot Loops.

Are synthetic food dyes bad for you? Here’s what the science says.

California is banning them in schools. The FDA says they’re fine. But synthetic dyes added to food to make them more colorful have a long, troubled history.