Anonymous. (1867). The Tree of Life, or Human Degeneracy: Its Nature and Remedy as Based on the Elevating Principle of Orthopathy. Dental Cosmos 9: 224.
Anonymous. (1867). Orthopathy and Dr. J. Jennings. Buffalo Medical and Surgical Journal 7 (5): 193-194.
(1992, Jan/Feb). Timeless Teachings – Isaac Jennings, M.D. – The world’s first hygienic doctor. Health Science – Living in Harmony With Nature, V 15(No 1), pp22.
https://www.healthscience.org/wp-content/uploads/2023/03/V15-N1-Health-Science-jan.-feb.-1992.pdf
Barker C. The Founding of the New Haven County Medical Association. Yale J Biol Med. 1934 Jan;6(3):323-31. PMID: 21433600; PMCID: PMC2606507.
Burton, A., Burton, N, Krachler, B. (2018). Fasting Supervision and Lifestyle Care. Youngstown, OH. National Health Association.
Graham, S., Trall. R., Shelton, H. (2009) The Greatest Health Discovery. Youngstown, OH. National Health Association.
Hoff, H. “Isaac Jennings and the Magic Bullet.” Bulletin of the History of Medicine, vol. 35, no. 1, 1961, pp. 71–73. JSTOR,
http://www.jstor.org/stable/44446766. Accessed 13 Dec. 2023.
Lloyd, I. (2009). The History of Naturopathic Medicine: A Canadian Perspective. McArthur & Company. p. 386.
ISBN 978-1552787786
LoNigro, D. J. (1987, Jan/Feb). Health Pioneers – Isaac Jennings, M.D. (1788-1874). Health Science – Official Journal of the American Natural Hygiene Society, Inc., 10(No.1), 15, 18.
Shelton, H. (1968). Natural Hygiene: The Pristine Way of Life Youngstown, OH. National Health Association.
Wikipedia contributors. Isaac Jennings. Wikipedia, The Free Encyclopedia. March 14, 2023, 14:41 UTC. Available at:
https://en.wikipedia.org/w/index.php?title=Isaac_Jennings&oldid=1144590791. Accessed December 20, 2023.
The NHA wishes to remind the readers that nothing in this or other publications is intended to constitute medical treatment or advice. Readers should be aware that some previous publications do not reflect the NHA’s current health teachings or approach to health in several areas.
Our Mission
The mission of the National Health Association is to educate and empower individuals to understand that health results from healthy living. We recognize the integration of all aspects of health: personal, environmental, and social.
We communicate the benefits of a plant-based diet, exercise and rest, a healthy environment, psychological well-being, and when indicated, the use of fasting.



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