Regimen

Summary

For more than two thousand years, Western physicians believed that the most important thing medicine could do was not cure disease but prevent it. The tool for prevention was regimen, a system of rules governing daily life: what to eat, when to exercise, how much to sleep, what air to breathe, and how to manage emotions. Regimen was not just advice; it was the primary form of medical practice for educated physicians from the fifth century BCE through the eighteenth century. A physician who prescribed regimen was doing what medicine was supposed to do. A physician who reached for drugs or surgery was, by that standard, already admitting partial failure. The framework survived the fall of humoral theory, the rise of anatomy, and the chemical revolution. It disappeared only when medicine reorganized itself around specific disease entities and laboratory science.

The Invention of Regimen

Ancient medicine began with two tools: surgery and drugs. The Homeric heroes of the Iliad were treated with the knife and with medication; there was no dietary medicine in Homer’s world (Longrigg, 1998). The introduction of regimen as a third branch of therapeutics, and eventually the most esteemed branch, happened around the beginning of the fifth century BCE (Temkin, 1991). Dietetic medicine was a relatively late development in Greek medicine, introduced by Herodicus of Selymbria and brought to completion by Hippocrates (Longrigg, 1998). Ancient sources attributed the innovation to Herodicus specifically, a gymnastic trainer whose expertise in physical conditioning led him to combine food and exercise into a single regime designed for maintaining and improving health (Nutton, 2023). Whether Herodicus deserves the credit personally or merely represents a broader cultural shift, the development itself is clear: by the time the Hippocratic Corpus was being composed, regimen had become central to learned medicine.

The innovation mattered because it changed what medicine was for. Surgery and drugs are responses to illness already present. Regimen addressed the body before it fell sick. The author of the Hippocratic text On Regimen (c. 400 BCE), which Totelin calls “the most extensive Hippocratic therapeutics text” (Pormann (ed.), 2018), coined the term “pro-diagnosis,” his own word, as Lane Fox notes, making him “the first person known in history to be concerned with preventative medicine” (Lane Fox, 2020). The treatise presents an integrated theory of health maintenance combining food, drink, and exercise, requiring the physician to understand the properties of each (Longrigg, 1998). It stands as an independent work: along with Fleshes, it is contemporaneous with Hippocrates but independent of both the Coan and Cnidian schools (Jouanna, 1999). The concept implied that a skilled physician could detect imbalances in the body before symptoms appeared and correct them through adjustments to diet, exercise, and daily routine. The Hippocratic texts show a particular emphasis on knowing the patient as an individual: the Regimen asks the physician to prescribe according to the patient’s constitution, age, the climate of their region, the direction of the prevailing wind, and the seasonal conditions at the time of illness. (Stapley, 2024)

Yet the Hippocratic texts also recognized a limit on regimen’s explanatory scope. Nature of Man chapter 9 distinguishes diseases caused by regimen from diseases caused by the air: “When many people are stricken with a single disease at the same time, we should assign as the cause of it whatever is the most common factor, the one which all of us make use of: this is what we inhale. For it is clear at any rate that it is not each individual’s regimen that is responsible, when the disease attacks everybody one after the other, both younger and older, women and men, wine-drinkers no less than those who drink water.”(Pormann (ed.), 2018) Regimen governed individual health; epidemic disease required a different causal logic.

Plato recognized the novelty but was not enthusiastic. In the Republic, Jouanna observes, he opposed the new dietary medicine to the pharmacological medicine of the Homeric age and argued that prolonged regimen-based treatment distracted citizens from their civic duties (Jouanna, 1999). Plato’s complaint was that regimen turned free citizens into permanent patients, always monitoring and adjusting, always preoccupied with their own bodies. The criticism had force: a medicine built on prevention could extend its authority indefinitely into the daily life of the healthy.

The Therapeutic Hierarchy

The principle that gave regimen its authority was a hierarchy of interventions. Ackerknecht summarizes the Hippocratic arrangement: diet first, then drugs only if diet failed, and surgery as a last resort (Ackerknecht, 1955). The physician’s primary ally was nature itself, the body’s own healing capacity, and the physician’s primary job was to support that process through the correct management of daily life (Temkin, 1991). The energetic framework underlying this hierarchy was set out directly in the Regimen: fire, holding the hot and dry, and water, holding the cold and moist, together compose the body, and this schema extended to sex — females, inclining more to water, thrive on cold, moist, and gentle regimens, while males, inclining to fire, grow from dry and warm foods and activities. (Stapley, 2024)

This was not merely a preference; it was a therapeutic logic. The Hippocratic authors conceived disease agonistically, as a struggle between the physician and the illness (Jouanna, 1999). The governing principle was allopathic: opposites cure opposites (Pormann (ed.), 2018). If a disease was characterized by cold, it was treated with warming foods, warming activities, warming environments. The author of Nature of Man prescribed seasonal management on exactly these grounds: induce vomiting in winter to clear phlegm (cold and moist), use bowel evacuations in summer to cool bile (hot and dry) (Jouanna, 1999). Regimen was the continuous application of this logic to the body’s daily intake and output.

The primary texts provide direct statements of this logic. Regimen in Health states the prescription explicitly: “One should construct the regimens in relation to the individual’s time of life, and the season, and their physical type by counteracting the heat and cold which prevail in them, since then they will be healthiest.”(Pormann (ed.), 2018) The treatise Humours (chapter 15) connects the logic to seasonal change itself: after noting that changes are responsible for diseases “in the seasons just as in everything else,” the author adds that “seasons which arrive gradually are the safest, just as are regimens … which are directed gradually.”(Pormann (ed.), 2018) The principle of gradual adjustment, not violent opposition, governed Hippocratic regimen at the level of both seasonal transitions and daily therapeutic practice. Empedocles’s four-element theory provided the conceptual scaffolding for this entire system: its explanatory range was sufficient that theories of disease based on only three humours fell out of favour, and the four elements came to shape medical thinking about regimen and treatment throughout antiquity (Nutton, 2023).

Celsus, writing in the early first century CE, articulated what Scarborough calls “the distinctly Roman ideal that a healthy man should not need a physician.” A healthy person, Celsus wrote, “ought not to place himself under any arbitrary rules” but instead should seek variety: “sometimes be in the country, sometimes in the city, more often should he be on a farm. He should sail, hunt, rest from time to time, but more frequently exercise his body” (Scarborough, 1969). This vision of health through active, varied living rather than medical supervision represents one pole of the regimen tradition: the ideal of self-sufficiency.

The Six Non-Naturals

The theoretical framework that organized regimen for the next millennium and a half was the doctrine of the “non-naturals.” Medieval Galenic physicians divided existence into three categories: the “naturals” (elements and humours that constituted the body), the “contra-naturals” (pathological conditions), and the “non-naturals,” the modifiable conditions of daily life that could tip the body toward health or disease (Rawcliffe, 1997). Preventive medicine through regimen ranked high in medieval medical practice, and treatment for illness, similarly, consisted for the most part of mild medication — hardly more than nursing and herbal infusions — with talk occupying a role that later therapeutic frameworks would undervalue.(Jackson (ed.), 2011)

The six non-naturals were surrounding air, food and drink, sleep and waking, exercise and rest, retention and evacuation, and the emotions; health could be maintained or restored by adjusting them (Pormann, 2007). The Islamic tradition transmitted and extended this framework: Avicenna, in the Canon of Medicine, enumerated seven matters for preserving health — diet, evacuation, breathing wholesome air, safeguarding inner heat and nutrition, guarding against outer influences, and following a moderate balance of exercise, rest, and sleep — a schema that closely parallels the Galenic six non-naturals while carrying the framework forward through Arabic medicine. (Stapley, 2024) As Wear specifies from the Galenic Latin tradition, the full list was: (1) air, (2) food and drink, (3) sleep and waking, (4) movement and rest, (5) retention and evacuation (including sexual activity), and (6) the passions of the soul (Wear, 2000). The term “non-natural” is misleading to modern ears; it did not mean unnatural. It meant neither constitutive of the body (like the humours) nor hostile to it (like disease), but external factors over which a person had some control. They were the levers of preventive medicine.

Temkin traces the doctrine’s longevity: “Down to the early nineteenth century hygiene was taught more or less under the headings of these six ‘non-naturals,’ as the medieval Galenists called them” (Temkin, 1973). The framework proved durable in part because it was capacious. A physician advising on regimen was simultaneously advising on nutrition, exercise physiology, sleep hygiene, emotional well-being, and environmental health. The six categories encompassed what a modern health system would distribute across half a dozen specialties.

The framework also carried a moral dimension. Regimen literature consistently treated intemperance in eating and drinking as both a medical and a religious failing. Wear observes that “the disregard of health advice led to vice, whilst the acknowledged existence of gluttony and drunkenness gave implicit support to the medical case for moderation” (Wear, 2000). Temperance was a bridge between medicine and religion: it meant both the right humoral balance and the right moral disposition. Galen’s physiological account made this precise: he accepted nine possible temperaments derived from the four primary qualities (hot, cold, wet, dry), and held that every individual possessed a natural mixture that determined the appropriate regimen for that person (Nutton, 2023). Galen made the moral connection explicit as well, arguing that correct diet was linked to moral virtue, that proper regimen balanced the body’s temperament and psychic functions, making the choice of diet a moral matter (Temkin, 1991).

The Regimen Genre

The practical elaboration of these principles generated a literary genre: the regimen sanitatis (guide to healthy living). The most famous example was the Regimen Sanitatis Salernitanum, a poem in Latin hexameters attributed to the School of Salerno. Osler identified Salerno as “the first organized medical school in Europe,” drawing on both Greek and Arabic sources (William Osler, 1921). The Regimen itself prescribed a memorable trio of physicians: “Doctor Quiet, Doctor Merry-man, and Doctor Diet,” encapsulating the Salernitan emphasis on rest, cheerful spirits, and moderate eating (John Harington (trans.), 1920). The text warned against afternoon sleep (said to breed fevers, laziness, headache, and catarrh), against suppressing flatulence (said to cause cramps, dropsy, and vertigo), and against heavy suppers (John Harington (trans.), 1920). It classified foods by their humoral character: peaches, pears, milk, cheese, and salted meat were melancholic and harmful to the sick; fresh eggs, red wines, and rich broths were nourishing (John Harington (trans.), 1920).

After the Black Death, the genre expanded. Rawcliffe notes that regimen literature became a major literary form in late medieval England, providing dietary, environmental, and lifestyle advice tailored to individual “complexions” (Rawcliffe, 1997). In 1424, the Oxford physician Gilbert Kymer composed a Dietarium de Sanitatis Custodia for Humphrey, Duke of Gloucester, with twenty-six chapters covering diet, digestion, exercise, and the dangers of sexual excess (Rawcliffe, 1997).

In early modern England, the genre reached its greatest volume. Wear identifies a succession of English regimen books (Thomas Elyot’s Castel of Helthe, William Bullein’s Government of Health, Thomas Cogan’s Haven of Health, Tobias Venner’s Via Recta ad Vitam Longam), all organized around the six non-naturals, all directed at literate and well-to-do readers (Wear, 2000). The genre functioned as “the luxury end of medicine”: it offered lifestyle choices unavailable to the poor, while spreading the principles of learned medicine to lay readers and helping to create what Wear calls “a unified medical culture” (Wear, 2000).

Food, Medicine, and the Porous Boundary

One of regimen’s most distinctive features was its refusal to separate food from medicine. This was already established in the Hippocratic Regimen, which organized herbs and vegetables by their energetic qualities: mustard, rocket, and coriander were classed as hot; lettuce, mint, and fresh purslane as cooling; sage as drying; pumpkin and turnip as moistening. (Stapley, 2024) In early modern England, Wear observes, “herbs, vegetables, cereals, fruits, fish, fowl and meats were perceived as food … and also as having the ability to preserve or damage health, and to act as remedies” (Wear, 2000). Lay manuscripts placed food recipes and medical recipes side by side or inside the same covers. The cook and the physician worked the same material: Andrew Boorde wrote that “a good coke is halfe a physycyon,” because “the chefe physycke … doth come from the kytchyn” (Wear, 2000).

This porosity reflected the logic of Galenic physiology. Wear explains that food was the origin of a tripartite system of bodily functions: venous blood made in the liver from digested food, vital arterial blood altered in the heart, and animal spirits produced in the brain. This made diet the foundation of all bodily operations (Wear, 2000). To adjust diet was to intervene at the source of the body’s entire economy.

The seasonal fluctuation of humours added temporal precision. The author of Nature of Man taught that the four humours waxed and waned with the seasons: phlegm (cold and moist) dominated in winter, blood in spring, yellow bile in summer, black bile in autumn (Jouanna, 1999). The healthiest year was one of seasonal moderation (metriotis), with no violent changes (Jouanna, 1999). This meant regimen was not a fixed prescription but a moving calibration: the correct diet in January was wrong for July, and the physician who prescribed the same regimen year-round was ignorant of the body’s seasonal rhythms.

The Countryside Ideal

Regimen writers consistently identified the countryside as the healthiest environment and rural laborers as the healthiest people. Wear notes that this served a structural purpose in the genre: because country laborers were the benchmark for health, their conditions of life needed no medical scrutiny. Medical attention was reserved for the urban, sedentary, and affluent, the people whose lifestyle deviated from the natural baseline (Wear, 2000).

Celsus had expressed the same ideal centuries earlier. His vision of the healthy life was one of variety and physical activity: country and city, farming and sailing, hunting and exercise (Scarborough, 1969). Scarborough reads this as reflecting a broader Roman conviction that public hygiene (aqueducts, baths, and sewage systems) was more important than medical practice. Celsus, Vitruvius, and Frontinus all “considered maintaining health through sanitation more important than depending on the medical practice of the day” (Scarborough, 1969). Regimen, on this view, was not primarily a matter of individual physician-patient advice but of collective environmental management.

Why Regimen Was Hard to Follow

Despite the volume of advice literature, it was universally acknowledged that few people actually followed the recommended regimens. Wear notes that “the authors of books on regimen complained, as do modern advocates of preventive medicine and health education, that living according to rules of health was not popular” (Wear, 2000). Thomas Cogan reported the common saying: “He that liveth by Physicke, liveth miserably.” The paradox of regimen was that everyone agreed it was the best kind of medicine, and almost nobody wanted to live by it.

The Hippocratic physicians had encountered the same problem. Jouanna observes that they monitored patient compliance rigorously, with the author of Prorrhetic II devoting a long section to detecting dietary and exercise violations through daily morning visits and close observation of facial color (Jouanna, 1999). Patients who lied about following their regimen and then died of non-compliance were a professional hazard: blame fell on the physician, not the patient.

The Helmontian Challenge and the Survival of Regimen

The Regimen Sanitatis Salernitanum described six factors for daily health preservation — diet, mobility, sleep, and moderating desires and emotions — corresponding closely to the six non-naturals that Galenic medicine had formalized; it became the most famous document to emerge from Salerno, and reached English readers when Sir John Harington translated it during the reign of Elizabeth I, published in 1607. (Stapley, 2024)

The most serious intellectual assault on regimen came from the Helmontians in the second half of the seventeenth century. Their target was the allopathic principle, the cure-by-contrary that governed the entire system of regimen and evacuative therapy. George Thomson argued that the “Rule of Contraries derived from Imaginary Supposition of the Hostility and Reluctancy of the Four Elements … hath been the bane of many Myriads” (Wear, 2000). If the theoretical foundation of oppositional treatment was wrong, then the whole structure of adjusting hot against cold, moist against dry, through food and regimen was unjustified.

The Helmontians failed to dislodge the system. Wear argues that one reason was that “patients would not discard traditional therapeutic methods” (Wear, 2000). Even physicians sympathetic to the new chemical philosophy found that their patients expected the familiar framework of regimen, evacuation, and dietary management. Despite the revolution in natural philosophy, Wear observes, “purging, bleeding and all the other means of expelling disease and putrefaction were carried out as enthusiastically as before” (Wear, 2000). Regimen was structurally unaffected.

Wear characterizes the entire history of English health advice from 1550 to 1680 as l’histoire immobile, history without significant change. “There was a great deal of consensus about health advice, with no controversies or significant new arguments across the sixteenth and seventeenth centuries, with the exception of some Helmontian attacks” (Wear, 2000). The genre endured not because it was rigorously tested but because it was deeply embedded in how people understood the relationship between daily life and bodily health.

The Enlightenment Critique

By the eighteenth century, regimen still governed medical advice, but dissenting voices had appeared within learned medicine itself. Wear notes that therapeutic practice, including regimen, remained “relatively unaltered” into the eighteenth century, even as the theoretical framework shifted toward empirical philosophy (Wear, 2000).

The sharpest internal critique came from William Heberden, writing in his Commentaries on the History and Cure of Diseases (1802). Heberden argued that “physicians are too strict and particular in the rules of diet and regimen” and that “too anxious attention to these rules hath often hurt those who are well, and added unnecessarily to the distresses of the sick” (Heberden, 1802). He trusted patients’ own judgment about food choices over physicians’ prescriptions, stating that he had never met “any person of common sense (except in an acute illness) whom I did not think much fitter to choose for himself, than I was to determine for him” (Heberden, 1802). Heberden was not rejecting regimen as a concept; he was rejecting the authority of the physician to micromanage it. His position represented a shift toward patient autonomy within the regimen framework, not an abandonment of the framework itself.

See Also

• Dietetics
• Six Non-Naturals
• Humoral Theory
• Vis Medicatrix Naturae
• Preventive Medicine
• Regimen Sanitatis Salernitanum
• School of Salerno
• Celsus
• Galen
• Nature of Man

Sources

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