The Paleolithic iet[a] (or Paleolithic nutrition), also popularly known as the paleo diet (var.: paleodiet), caveman diet, Stone Age diet and hunter-gatherer diet, is a dietary regimen which seeks to mimic the diet of wild plants and animals that humans[b] habitually consumed during the Paleolithic, a period of about 2.5 million years duration that ended around 10,000 years ago with the development of agriculture. Based upon commonly available modern foods, the Paleolithic diet consists mainly of lean meat, fish, vegetables, fruit, roots and nuts, and excludes grains, legumes, dairy products, salt, refined sugar and processed oils.