“Potassium bromate, a potent oxidizer that helps bread rise, has been linked to kidney and thyroid cancers in rodents. Azodicarbonamide, a chemical that forms bubbles in foams and plastics like vinyl, is used to bleach and leaven dough – but when baked, it, too, has been linked to cancer in lab animals.” The Guardian: Banned bread: why does the US allow additives that Europe says are unsafe? (Maybe the FDA is loafing…)