The Caveman Diet, also known as the Paleo Diet, is a dietary plan based on the presumed ancient diet of wild plants and animals that various human species habitually consumed during the Paleolithic era. It is based on the idea that modern humans should go back to eating the same foods their ancestors ate before the development of agriculture. The diet consists mainly of fish, grass-fed pasture raised meats, eggs, vegetables, fruit, fungi, roots, and nuts, and excludes grains, legumes, dairy products, potatoes, refined salt, refined sugar, and processed oils.