The investigative arm of the US Congress said that genetically modified foods pose no greater threat to health than conventionally produced foods. A study prepared for Congress by the US General Accounting Office found that consumers of genetically modified foods are at no greater risk of allergies or toxic reactions. Researchers found that the US Food and Drug Administration had carried out sufficient tests on to ascertain the safety of biotech foods before clearing them for the market. The average risk assessment by the FDA for a new genetically modified food product takes between 18 months and three years.