Dr. James Caleb Jackson was a religiously conservative vegetarian. He ran Dansville Sanitarium in Dansville, New York.
In 1863, Jackson invented the first cereal named Granula. It was broken up pieces of dried graham flour dough that was soaked overnight in milk to be edible. Granula was invented to challenge people who ate meat, but back then it was not that tasty.
Charles William Post
John Harvey Kellogg was a surgeon and a health food pioneer at Battle Creek Sanitarium in Battle Creek, Michigan. In the late 1800s, he was inspired by Jackson, so he made a biscuit of oats, wheat, and corn. He named it Granula, but was sued by Jackson, so he renamed it granola.
John Harvey Kellogg worked with his brother, Will Keith Kellogg to make new breakfast items. They boiled wheat and rolled it to sheets then grinded them. In 1894, the brothers forgot a pot of boiled wheat, but the next day rolled it out. It created flakes, so the brothers toasted them, and they created wheat and corn flakes. Without his brother, W.K. Kellogg sold and packaged the cereal in 1906.
Charles William Post built a health resort in Battle Creek because he was inspired when he visited Battle Creek Sanitarium. He offered his guest bite-sized versions of Granula, called Grape-nuts. Post also sold corn flakes, named Post Toasties.
Quaker Oats, a company that was known for its hot cereals, obtained puffed-rice technology in the early 20th century. Later, puffed cereal was loaded with sugar for kids to eat, which became the usual. Examples of puffed cereal are Cheerios, Trix, and Rice Krispies.