<P> Some mammals typically used for food production have been modified to produce non-food products, a practice sometimes called Pharming . </P> <P> A GM salmon, awaiting regulatory approval since 1997, was approved for human consumption by the American FDA in November 2015, to be raised in specific land - based hatcheries in Canada and Panama . </P> <P> There is a scientific consensus that currently available food derived from GM crops poses no greater risk to human health than conventional food, but that each GM food needs to be tested on a case - by - case basis before introduction . Nonetheless, members of the public are much less likely than scientists to perceive GM foods as safe . The legal and regulatory status of GM foods varies by country, with some nations banning or restricting them, and others permitting them with widely differing degrees of regulation . </P> <P> Opponents claim that long - term health risks have not been adequately assessed and propose various combinations of additional testing, labeling or removal from the market . The advocacy group European Network of Scientists for Social and Environmental Responsibility (ENSSER), disputes the claim that "science" supports the safety of current GM foods, proposing that each GM food must be judged on case - by - case basis . </P>

Which food products in the united states are often genetically modified using genetic engineering