John Harvey Kellogg died on December 14, 1943, in Battle Creek, Michigan, at the age of 91. His death marked the end of a long and influential life dedicated to health reform, medicine, and the development of the breakfast cereal industry.

Fire struck the Herald on December 30, 1902, where Kellogg's book "The Living Temple" was typeset and ready to print. The book was criticized by White for what she considered its many statements of pantheism. This event added to the growing tensions between Kellogg and the Seventh-day Adventist Church.

The Battle Creek Sanitarium, originally owned by the Seventh-day Adventist Church but run by Kellogg, was destroyed by fire on February 18, 1902. This event marked a pivotal moment, leading to financial strain, theological conflicts, and disagreements about rebuilding the institution.

John Harvey Kellogg married Ella Ervilla Eaton on February 22, 1879. This marked an important personal event in his life, though the couple chose to maintain separate bedrooms and did not have biological children, fostering many others.

John Harvey Kellogg was born on February 26, 1852, in Tyrone, Michigan. This marks the beginning of the life of a significant figure in health reform, the development of breakfast cereals, and the promotion of vegetarianism and other health practices.