"down right quackery and imposition" and a "disgrace to the regular profession". A review of his book The Tree of Life suggested it was "without a particle of merit" and the ideas would not be popular with people of the present day. Jennings died of pneumonia on March 13, 1874 in Oberlin, Ohio. Jennings influenced many natural hygienists including Felix L. Oswald, Russell T. Trall, Herbert M. Shelton, Hilton Hotema and many others. He has been listed as a father of the hygiene movement. Publications Medical Reform: A Treatise on Man's Physical Being and Disorders (1847) The Philosophy of Human Life (1852) The Tree of Life: Or, Human Degeneracy, its Nature and Remedy: Based on the Elevating Principle of Orthopathy (1867) See also Sylvester Graham References 1788 births 1874 deaths 19th-century American physicians American Congregationalists American health and wellness writers American temperance activists American vegetarianism activists Deaths from pneumonia in Ohio Orthopaths People from Fairfield, Connecticut Pseudoscientific diet advocates Tea critics Vitalists Yale School of Medicine alumni