When did John Harvey Kellogg become famous?

John Harvey Kellogg became famous in the late 19th and early 20th centuries, primarily for his work as a health reformer and the inventor of breakfast cereal.

Here are some key events that contributed to his fame:

* 1876: He became superintendent of the Battle Creek Sanitarium, a health resort that promoted his health philosophies.

* 1894: He developed the first commercially produced breakfast cereal, Granola, which was initially intended for patients at the sanitarium.

* Early 20th century: He continued to develop and promote various health foods and practices, including vegetarianism, exercise, and hydrotherapy.

* 1906: He published his book "The Art of Living", which became a bestseller and further popularized his health principles.

However, his fame was also tarnished by his controversial views on sexuality and his obsession with promoting his own brand of health food and practices.