For years, W. K. Kellogg assisted his brother in research aimed at improving the vegetarian diet of the Battle Creek Sanitarium's patients, especially in the search for wheat-based granola. In 1894 at the Battle Creek Sanitarium, a combination hospital and health spa for the elite and famous, W.K. Kellogg and his brother, Dr. John Harvey Kellogg were in the process of cooking some wheat for a type of granola when they were called away. When they returned, the wheat had become stale. They decided to force the tempered grain through the rollers anyway, and surprisingly, the grain did not come out in long sheets of dough. Instead, each wheat berry was flattened and came out as a thin flake.