Cars in Tacoma, Wash., promote a "yes" vote on a ballot initiative that would have required genetically engineered foods to be labeled. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Morgan Barnett, 7, drinks from containers of 1 percent milk and chocolate milk during lunch at a school in St. Paul, Minn., in 2006. Eric Miller/AP hide caption

itoggle caption Eric Miller/AP

There might be much more caffeine than you think in those supplements you're taking. There also might be much less. Janine Lamontagne/iStockphoto hide caption

itoggle caption Janine Lamontagne/iStockphoto

While lots of labels tout their lack of genetically modified ingredients, if California's Prop. 37 succeeds, foods containing GMOs would have to be labeled. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP

If you look very closely, you'll see "evaporated cane juice" in the ingredients list on this yogurt. A California woman is suing the Chobani yogurt company over its use of the term. Karen Castillo Farfán/NPR hide caption

itoggle caption Karen Castillo Farfán/NPR

There's no industry standard size for food and drink portions, so it's hard to compare a Big Gulp with a McDonald's medium soda. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

New York Winemaker Christopher Tracy and a bottle of his Blaufrankisch. The wine's difficult to pronounce name may attract oenophiles. Charles Lane/NPR hide caption

itoggle caption Charles Lane/NPR

Beef cuts that are used to make "pink slime" or lean finely textured beef were on display during a tour in March of the Beef Products Inc.'s plant in South Sioux City, Neb. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

People march demanding labels for genetically modified food near the White House in Washington, D.C., on Oct. 16, 2011. Ren Haijun/Xinhua /Landov hide caption

itoggle caption Ren Haijun/Xinhua /Landov