 Advocacy groups such as the Center for Food Safety, Organic Consumers Association, Union of Concerned Scientists, and Greenpeace say risks have not been adequately identified and managed, and they have questioned the objectivity of regulatory authorities.The safety assessment of genetically engineered food products by regulatory bodies starts with an evaluation of whether or not the food is "substantially equivalent" to non-genetically engineered counterparts that are already deemed fit for human consumption.No reports of ill effects have been documented in the human population from genetically modified food.