Companies have added thousands of ingredients to foods with little to no government oversight. That's thanks to a loophole in a decades-old law that allows them to deem an additive to be generally recognized as safe" - or GRAS - without the U.S. Food and Drug Administration's blessing, or even its knowledge. The loophole was originally intended to allow manufacturers of common ingredients like vinegar and table salt ... to bypass the FDA's lengthy safety-review process. But over time, companies have found that it's far more efficient to take advantage of the exemption to get their products on shelves quickly. Some of these products contain additives that the FDA has found to pose dangers, [and] companies regularly introduce new additives without ever informing the FDA. The Government Accountability Office ... published a report in 2010 that found that "FDA's oversight process does not help ensure the safety of all new GRAS determinations." And even when a company does go through the FDA review process, safety decisions have been criticized. For example ... lawsuits allege that mycoprotein, a type of fungus used in vegetarian products, has caused consumers to suffer a range of reactions, including nausea and anaphylactic shock. The complaints prompted the Center for Science in the Public Interest to urge the FDA in 2011 to revoke the ingredient's GRAS status. In the past five decades, the number of food additives has skyrocketed - from about 800 to more than 10,000.