We know we should stay clear of hard-and-fast food but some foods can seriously mess with your health. "It doesn't mean you'll get sick, get cancer, or die if you eat a dangerous food once," says Nneka Leiba, deputy director of research at the Environmental Working Group (EWG), which catalogs studies on potential toxins found in specific brand-name foods and ranks their safety in a massive database. "But there are certain foods you should avoid as much as possible if you have a choice."
