US consumers have voiced only mild concern over genetically modified ingredients in food, although the issue causes an uproar in Europe. US food companies say they are "under little pressure to change," according to a report by CNN Food Center.The report said that as an expected record harvest of corn and soybeans gets underway in the United States, with some 50 million acres (20 million hectares) planted with GM seeds, "food makers and consumers are not alarmed even as advocacy groups step up the pressure.