Sylvester Graham was an American dietary reformer born in 1794. He is best known for promoting a vegetarian diet and the consumption of whole grains, particularly Graham flour, which he believed could improve health and prevent disease. His ideas were part of a broader movement in the 19th century that emphasized natural foods and healthy living. Graham was also a key figure in the Grahamite movement, which advocated for a lifestyle that included exercise, temperance, and moral living. His teachings influenced various health movements and even contributed to the development of Graham crackers, a popular snack that reflects his emphasis on whole grains and healthy eating.