Upton Sinclair Jr. (September 20, 1878 – November 25, 1968) was an American writer who wrote nearly 100 books and other works in several genres. Sinclair’s work was well known and popular in the first half of the 20th century, and he won the Pulitzer Prize for Fiction in 1943. His most famous book, The Jungle from 1906, was about the American meat-packing industry. Sinclair was keenly interested in health and nutrition. He experimented with various diets, and with fasting. He wrote about this in his book, The Fasting Cure (1911), another bestseller. He believed that periodic fasting was important for health, saying, ‘I had taken several fasts of ten or twelve days’ duration, with the result of a complete making over of my health’.Sinclair favored a raw food diet of predominantly vegetables and nuts. For long periods of time, he was a complete vegetarian, but he also experimented with eating meat. His attitude to these matters was fully explained in the chapter, “The Use of Meat”.