|Unknown anime girl indulges in New World cuisine.|
Like many fallacies, it's an overdoing of a basically sound idea. If it's natural, it's been around a long time, and therefore it's not likely to harm us in an unexpected way. That morphs into the idea that all natural things are safe — forgetting the "unexpected" part — and that therefore, in another lapse of logic, all artificial things are not safe.
Clearly, new artificial things might not be safe, so caution is called for. But of course we've been consuming artificial things for millennia. Most food plants have been modified beyond recognition by farmers over the years.
But it's not the artificiality so much as it is the newness. Greg Cochran, with tongue firmly in cheek, warns us Oldworlders about the hazards of Newworldish grub. From his blog HERE.