It may sound odd, but in America, your loaf of bread can contain ingredients with industrial applications - additives that also appear in things like yoga mats, pesticides, hair straighteners, explosives and petroleum products. Some of these chemicals, used as optional whiteners, dough conditioners and rising agents, may be harmful to human health. Potassium bromate, a potent oxidizer that helps bread rise, has been linked to kidney and thyroid cancers in rodents. Azodicarbonamide (ACA), 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. Other countries, including China, Brazil and members of the European Union, have weighed the potential risks and decided to outlaw potassium bromate in food. India banned it in 2016, and the UK has forbidden it since 1990. Azodicarbonamide has been banned for consumption by the European Union for over a decade. But despite petitions from several advocacy groups - some dating back decades - the US Food and Drug Administration (FDA) still considers these to be Gras or generally recognized as safe" to eat, though plenty of experts disagree. The FDA does not review every additive that makes its way into food. Instead, companies can rely on their own experts to determine what's safe and what isn't. And once something was determined as Gras, [medical toxicologist Ryan] Marino said, "there is not often any financial incentive for additional testing".