Sylvester Graham, American minister and activist (d. 1851)
Sylvester Graham (July 5, 1794 – September 11, 1851) was an American Presbyterian minister and dietary reformer known for his emphasis on vegetarianism, the temperance movement, and eating whole-grain bread. His preaching

inspired the graham flour, graham bread, and graham cracker products.: 29  Graham is often referred to as the "Father of Vegetarianism" in the United States of America.: 15