US population is not doing just fine when it comes to nutrition and overall health. What is wrong would make a very lengthy article on its own, but I guess we can agree there are definitely things to improve, and this could be one of them.
One of the reasons we might not be having fiber cravings is, we don't need it for ourselves per se, but foreign, albeit friendly gut bacteria. It is possible for bacteria to manipulate its hosts ie by releasing some enzymes, but maybe we didn't evolve our symbiosis that far yet. Or we're drowning those cravings into more intense ones like sugar or other addictions.
One of the reasons we might not be having fiber cravings is, we don't need it for ourselves per se, but foreign, albeit friendly gut bacteria. It is possible for bacteria to manipulate its hosts ie by releasing some enzymes, but maybe we didn't evolve our symbiosis that far yet. Or we're drowning those cravings into more intense ones like sugar or other addictions.