Regimen is a old genre, codified in the Middle Ages. It advises the reader how to preserve his or her health by managing lifestyle factors known as the “Six Non-Naturals”: eating; sleep; emotions; evacuations (ie, urination, defecation); air; and exercise. Such works focus on health maintenance rather than on curative medicine.
Hygiasticon: or, the right course of preserving life and health unto extream old age