Divisions James Caleb Jackson (March 28, 1811 – July 11, 1895) was an American nutritionist and the inventor of the first dry, whole grain breakfast cereal which he called Granula.

[1] His views influenced the health reforms of Ellen G. White, a founder of the Seventh-day Adventist Church.

[3][6] As a result, he spent the second half of his life as an advocate for hydropathy, training to become a physician and opening a hydropathic institute at Glen Haven on Skaneateles Lake in Cortland County, New York, in 1847.

Under Jackson's management, the spa grew to become one of the largest in the world, catering to around 20,000 patients, and was renamed 'Our Home on the Hillside'.

Over time, he removed red meat from the menu at the spa and ruled out tea, coffee, alcohol, and tobacco.