Until recently, scientists believed human consumption of grains like wheat and rice began about 13,000 years ago. A new find in Israel indicates we may have been consuming grains in some form 10,000 years earlier.
Human remains at a site called Ohalo II show evidence of early grain consumption. Over 90,000 plant remains indicate the principal food sources aside from hunted meats were "seeds from small grasses, augmented by acorns, almonds, pistachios, wild olives, raspberry, wild fig and grape." (Reuters via MSNBC).
Probably due to the intense manual effort required to process grain, this particular burst of grain-eating doesn't seem to have lasted, but it does indicate the days of nomadism and the hunter were fated to give way to the farmer and the field as long as 23,000 years ago.