John has decided to adjust his dietary habits to eating to only products that could have been hunted and gathered before modern civilization. Which diet is he following?
Vegetarian
Mediterranean
Vegan
Paleo
Explanation: The Paleolithic diet, Paleo diet, caveman diet, or stone-age diet is a modern fad diet requiring the sole or predominant eating of foods presumed to have been available to humans during the Paleolithic era.
