 Some consumers, including many in the US, came to see GM food as "unnatural", with various negative associations and fears (a reverse halo effect).Specific perceptions include a view of genetic engineering as meddling with naturally evolved biological processes, and one that science has limitations on its comprehension of potential negative ramifications.An opposing perception is that genetic engineering is itself an evolution of traditional selective breeding, and that the weight of current evidence suggests current GM foods are identical to conventional foods in nutritional value and effects on health.