the paleolithicof, or relating to, or denoting the early phase of the Stone Age, lasting about 2.5 million yeas ago, when primitive stone tools and implements were used dietthe kinds of food a person, animal, or community habitually eats; a regiment of eating may be designed for special medical or health benefits and may be called a "diet" is a modern nutritional plan based on the presumed diet of Paleolithic humans, which relates to the cultural period of the Stone Age beginning with the earliest chipped stone tools, about 750,000 years ago, until the beginning of the Mesolithic Period, about 15,000 years ago