"John Harvey Kellogg was one of America's most beloved physicians; a best-selling author, lecturer, and health-magazine publisher; founder of the Battle Creek Sanitarium; and patron saint of the pursuit of wellness. His youngest brother, Will, was the founder of the Battle Creek Toasted Corn Flake Company, which revolutionized the mass production of food and what we eat for breakfast. In The Kelloggs, Howard Markel tells the sweeping saga of these...