Cold cereal as a health food

Dr John Kellogg ran a sanitorium and made a type of granola out of wheat, cornmeal and oats as a remedy for chronic digestion problems resulting from high-protein diets.

But oat groats had to be soaked before cooking, so with the help of his brother, Kellogg developed a process to produce crispy wheat flakes. Four years later, they started selling toasted corn flakes, and cold cereal was born. Dr Kellogg advertised his corn flakes as healthy through cookbooks and marketing pamphlets.