 "Savanna Principle" is a term coined by Satoshi Kanazawa in 2004 for the principle that human behavior remaining to some extent adapted to the ancestral environment of early "Homo" in the savanna may lead to problems in a modern (Industrial or post-Industrial) environment.Kanazawa uses this disparity to explain "a host of societal difficulties".For example, ancestors who craved sugary and fatty foods lived longer and were healthier than those who didn't, in a time that such things were relatively scarce.