TIL Kellogg's cofounder John Kellogg ran a sanitarium in Battle Creek MI where his cereals were part of the patient's diet. Future competitor CW Post was a patient in 1891, settled in the same town and started selling his own knock-offs of Kellogg's cereals and even opened his own sanitarium in 1892

https://en.wikipedia.org/wiki/John_Harvey_Kellogg#Patents_and_inventions
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gfohr9/til_kelloggs_cofounder_john_kellogg_ran_a/