Purveyors of spiritualized medicine have been legion in American religious history, but few have achieved the superstar status of Dr. John Harvey Kellogg and his Battle Creek Sanitarium. In its heyday, the "San" was a combination spa and Mayo Clinic. Founded in 1866 under the auspices of the Seventh-day Adventist Church and presided over by the charismatic Dr. Kellogg, it catered to many well-heeled health seekers including Henry Ford, John D...