When a child arrives at a Vitae Health well-child visit, the visit is organized — whether the parent notices or not — by a framework a Christian physician in 1150 would recognize. The six res non naturales, the six non-naturals of medieval regimen sanitatis, name the six categories in which everything a body does between feedings can be healthy or disordered. Every serious pediatric visit touches all six. Not because someone in the twelfth century said so, but because they are the real categories of a living body.
The word "non-natural" is misleading. It does not mean unnatural or artificial. In the Galenic vocabulary, there were things natural to the body (the elements, humors, organs), things contrary to nature (diseases), and a middle category called non-natural — the daily influences that are neither intrinsic to the body nor illnesses, but which shape health more than anything else. They are the modifiable determinants of a life. They are the things a physician and a family can actually do something about.
Here they are, as the Salernitan school listed them, with a one-paragraph description of how each appears in a modern telehealth visit.
I. Aer — Air
Environment, climate, ventilation, what surrounds the body. In a visit, this is where I ask about the house. Does the family have mold they can see? Is there a smoker within twenty feet of the child at any point in the day? How many hours a day is the child outdoors? What is the air quality index at the family's location this week? Asthma, allergies, respiratory infection, and sleep disruption all reach into this category. So does mood. A child who has not stood under the open sky in three days is a child being starved of a specific kind of nutrient.
II. Cibus et Potus — Food & Drink
What the body takes in, how much, and when. I ask parents to walk me through a representative twenty-four hours — not a food log, just a narration. Most families are surprised by what that narration reveals: the pouches at 10 a.m., the cup of juice at lunch, the snack before dinner, the unaccounted glass of milk at bedtime. Most of pediatric nutrition is not ignorance of what to eat; it is the drift of a long day. Medieval physicians were unusually clear on this: the question is never only "what did the child eat" but "in what order, under what conditions, with what spacing."
III. Motus et Quies — Motion & Rest
Activity, labor, stillness. Children are designed to move, and we now have an epidemic of stillness. I ask about screen time — but I ask about it through this category, not as a moral complaint. A child who is physically still for ten hours a day is a child whose skeletal, cardiovascular, and nervous systems are being under-recruited. A child who has never been bored is a child who has never had the experience of generating her own motion. The medievals understood that both excess and defect of motion disorder the body. We treat only excess — of the wrong motion — as a problem. The other error is invisible to us.
IV. Somnus et Vigilia — Sleep & Waking
The rhythm of consciousness. I ask what time the child fell asleep, woke up, and whether anything interrupted the middle. For a pediatric population, the hygiene of sleep is the single highest-leverage lifestyle intervention available. Anxiety, ADHD, migraine, reflux, and behavioral dysregulation all have a sleep leg. Almost no well-child visit in 2026 addresses this seriously. I try to. The medieval physicians considered irregular sleep one of the most dangerous of the six.
V. Repletio et Evacuatio — Retention & Evacuation
What the body gives back — urine, stool, sweat, menses. Parents are often embarrassed to report on this. Children are often unable to. But constipation, encopresis, dysmenorrhea, and urinary urgency are common, treatable, and frequently missed in rushed visits. A five-minute conversation here saves a specialist referral.
VI. Accidentia Animi — The Passions of the Soul
Emotions, stress, joy, grief, fear. The medievals listed this as the last of the six — last in order but, as Galen noted, first in magnitude of effect on the body. In a modern idiom: the emotional weather of a household is a variable in every physiological system. The child whose parents fought last night has a measurably different cortisol curve than the child whose parents did not. This is not a moralistic observation; it is a biological one. A good visit acknowledges it.
All six categories are modifiable. That is the part that matters. The body is not a machine we inherit. It is a life we are keeping, and there are six rooms in it to sweep.
Why this still works
A skeptic will ask why an eleventh-century framework has any claim on a 2026 clinic. The answer is simple. The body's modifiable determinants have not changed. The air a child breathes still matters. What she eats, how she moves, how she sleeps, what she eliminates, how she feels — these are the same six levers available in 1150 and in 2026. What has changed is our willingness to think about all six in a single conversation. Modern medicine has specialized each category into its own field and its own specialist. The generalist physician, sitting in a room with a child and her mother, has to put the six back together. The medieval framework is useful because it keeps the six visible in the same room. Nothing better has replaced it.
When I close a well-child visit at Vitae Health, I try to leave the parent with one small action inside each of the six. Not six life overhauls — six moves. A window open in the child's bedroom at night (aer). A ten-minute spacing between the last pouch and dinner (cibus). A daily walk, outside, regardless of weather (motus). A consistent lights-out time (somnus). A note to watch for regularity of bowel habit over the next week (evacuatio). A small ritual the family keeps that does not involve a screen (accidentia animi). The Quintivium teaches children to name these six categories by middle school. My hope is that by then, the six are how they think.
This is not nostalgia for a lost medicine. This is the medicine. It has been waiting for us.