Mary Baker Eddy (1821–1910), the founder of Christian Science, had a profound influence on health by promoting a spiritual approach to healing that minimized reliance on conventional medicine. She emphasized the power of prayer, faith, and mental discipline in overcoming illness, believing that disease stemmed from mistaken thought rather than physical causes. Unlike other health reformers of her time, Eddy did not strongly advocate for specific nutritional regimens, but she did encourage moderation in diet and warned against overeating, stimulants, and indulgence. Her writings, particularly Science and Health with Key to the Scriptures, framed true health as rooted in spiritual alignment rather than dietary practices alone, although she acknowledged that healthier, simpler foods could aid one’s well-being when coupled with right thinking. Her influence inspired many to reconsider the relationship between mind, body, and spirit in health, marking a distinct path from the more food-focused reformers of the 19th century.