pp. 30-31

The Jomon people tend to be mistaken as being mainly carnivorous due to their general perception as hunters, but they stored large amounts of nuts, such as acorns, and relied considerably on plant food.

The nuts in eastern Japan are acorns of broad-leaved deciduous trees such as mongolian oak, konara oak, Japanese horse chestnut, and chestnuts. In western Japan, acorns are from evergreen trees such as quercus gilva and castanopsis. In order to consume acorns, the Jomon people learned the technique of removing harshness from the nuts. What nurtured the lives of the Jomon people were the acorns, wild animals, and fish.