Zevist Meditation · Diet & Sleep

Diet & Sleep: Intermediate Level

updated by: High Priest Zevios Metathronos

Diet and sleep work as 1 system. Learn the mechanisms behind broken meals and broken nights, what the body asks of each food category, and how your own body answers.

Level

Intermediate

Diet Focus

Balance across the food categories, and an end to broken meals

Sleep Focus

A regular body clock, light and the evening wind-down

Daily Practice

Reading your own patterns across weeks

Outcome

A rhythm that holds without effort

Approach

Indicative guidance, adapted to each person

Hippocrates, Aphorisms II.51

τὸ κατὰ πολὺ καὶ ἐξαπίνης κενοῦν, ἢ πληροῦν, ἢ θερμαίνειν, ἢ ψύχειν, ἢ ἄλλως ὁκωσοῦν τὸ σῶμα κινέειν, σφαλερόν, καὶ πᾶν τὸ πολὺ τῇ φύσει πολέμιον· τὸ δὲ κατ’ ὀλίγον, ἀσφαλές.

To empty the body or fill it, heat it or cool it, or move it in any other way, greatly and suddenly, is dangerous, and every excess is hostile to nature. What goes little by little is safe.

Health, Diet and Sleep Notice

Everything on this page is INDICATIVE ONLY. It explains how food and sleep tend to work on the body and the mind. It gives no orders about what anyone must eat, and it can't replace a diet recommended by a doctor, a dietitian or another specialist who knows your body. People differ in genetics, age, health, activity and history, so every number here describes a general direction. Adapt every element to yourself.

If you have diabetes, heart, kidney or liver disease, high blood pressure, a digestive condition or a food allergy, are pregnant or breastfeeding, take medication affected by food or sleep, or have ever had an eating disorder, follow your physician's guidance first.

See a doctor if you snore loudly with pauses or gasps in your breathing, fall asleep while driving or in the middle of tasks, have trouble sleeping at least 3 nights a week for 3 months or longer, lose weight without trying, faint, or feel exhausted most days despite enough sleep.

You choose how you eat and how you sleep, under your own responsibility. The Temple of Zeus offers this material as general guidance in support of Meditation practice.

I. Diet and Sleep as 1 System

The Hippocratic δίαιτα treated food, drink, exercise, sleep and waking as 1 regimen. Galen of Pergamon later gathered the factors a person governs in daily life: the air, food and drink, motion and rest, sleep and waking, what the body takes in and lets out, and the passions of the soul. Medieval medicine called them the 6 non-naturals, and physicians built health on them for more than 1,000 years.

Modern science has found the same links in its own terms. Short sleep raises hunger. Late, heavy meals disturb sleep. Caffeine taken to fight tiredness pushes the next night later. Each part feeds the others, for better or for worse.

The aphorism at the head of this page names the danger in all of it: sudden emptying and sudden filling. A day of fasting followed by a night of feasting, a week of short nights followed by a weekend of long ones, both swing the body from 1 extreme to the other. Change that comes little by little is the safe kind.

The Intermediate Level works on the system as a whole: balance across the food categories, an end to broken meals and a regular body clock.

II. The Outcome of This Level

The outcome of the Intermediate Level is a regimen that holds without effort. Meals come with a rhythm and a balance that suit you, nights run at regular hours, and you understand why your energy rises or falls on a given day.

The markers below are indicative. Reach most of them and hold them, and you've done the work of this level.

Typical timeframe: 2 to 4 months of steady practice. Some people get there sooner and some take longer, and either pace is fine.

III. Your Body Answers to You

Hippocratic Corpus, On Ancient Medicine 20

τυρὸς γάρ, ἐπειδὴ τούτῳ σημείῳ ἐχρησάμην, οὐ πάντας ἀνθρώπους ὁμοίως λυμαίνεται, ἀλλ’ εἰσὶν οἵτινες αὐτοῦ πληρούμενοι οὐδ’ ὁτιοῦν βλάπτονται, ἀλλὰ καὶ ἰσχύν, οἷσιν ἂν συμφέρῃ, θαυμασίως παρέχεται. εἰσὶ δ’ οἳ χαλεπῶς ἀπαλλάσσουσι.

Cheese, to keep the example I used, doesn't harm all people alike. Some eat their fill of it without the slightest harm, and it gives remarkable strength to those it suits. Others fare badly with it.

The Hippocratic physician knew what modern nutrition has confirmed: the same food acts differently on different people. Many adults digest milk sugar poorly, while others drink milk all their lives without trouble. Some people sleep soundly after an evening coffee and others lie awake for hours. Researchers who fed volunteers identical meals have found blood sugar responses that vary widely from person to person.

So the most useful record of your diet is your own. At the Intermediate Level, the evening note becomes a tool for finding patterns across weeks:

• Look for the meals that hold you. Mark which meals carry you 4 to 5 hours on steady energy, and which leave you hungry or sleepy within 2.
• Look for the triggers. Note which foods, drinks and timings come before bad nights, low moods or heavy mornings.
• Look at the whole week. Compare weekdays with weekends. Most broken patterns show up as a swing between the 2.
• Change 1 thing and watch. Adjust a single habit for 2 weeks and read the result in your notes. Change several at once and you won't know which one did the work.

Xenophon, Memorabilia I.3.5, of Socrates

σίτῳ μὲν γὰρ τοσούτῳ ἐχρῆτο, ὅσον ἡδέως ἤσθιε, καὶ ἐπὶ τοῦτο οὕτω παρεσκευασμένος ᾔει ὥστε τὴν ἐπιθυμίαν τοῦ σίτου ὄψον αὐτῷ εἶναι.

He took as much food as he could eat with pleasure, and he came to his meals so prepared that his appetite served as his relish.

Socrates ate by his own measure. He came to the table hungry at the right time, so plain food tasted good, and he stopped where the pleasure of eating stopped. That's control of diet in its simplest form: the measure comes from attention to yourself.

IV. The Categories of Food and What the Body Needs

Each category of food does its own work, and the body needs all of them. The reference values below come from the World Health Organization, the European Food Safety Authority and the US National Academies. They describe average needs across healthy adult populations. They map what the body asks for, and they leave the choice of foods that supply it to you.

Energy ties the categories together. Protein and carbohydrate carry about 4 kcal per gram, fat about 9 and alcohol about 7 (FAO, 2003). When the energy taken in matches the energy spent, bodyweight holds steady. When intake runs above it for months, weight rises, and when intake runs below it, weight falls.

Balance means each category is present in enough measure and none takes over. A diet built almost entirely on 1 category leaves the body short of what the others supply, however generous the portions.

V. Broken Meals: How They Work on You

Hippocratic Corpus, On Ancient Medicine 10

ἢν ἀριστῆν μεμαθηκώς τις, καὶ οὕτως αὐτῷ συμφέρον ἦν, μὴ ἀριστήσῃ, ὅταν τάχιστα παρέλθῃ ἡ ὥρη, εὐθὺς ἀδυναμίη δεινή, τρόμος, ἀψυχίη· ἐπὶ τούτοις ὀφθαλμοὶ κοῖλοι, οὖρον χλωρότερον καὶ θερμότερον, στόμα πικρόν, καὶ τὰ σπλάγχνα δοκεῖ οἱ κρέμασθαι, σκοτοδινίη, δυσθυμίη, δυσεργείη.

If someone used to taking lunch, and suited by it, skips it, then as soon as the hour has passed he's struck by terrible weakness, trembling and faintness. Then come hollow eyes, greener and hotter urine, a bitter mouth, a feeling that the bowels hang loose, dizziness, low spirits and an inability to work.

The Hippocratic writer described the skipped meal down to the low spirits, δυσθυμίη, and the inability to work, δυσεργείη. Modern physiology explains the mechanism:

• Blood sugar falls. Between meals, the liver releases stored sugar to keep the brain supplied. A long gap, especially after a sugary meal, can leave many people shaky, foggy and short-tempered.
• Stress hormones rise. The body answers a long gap with adrenaline and cortisol, which keep sugar flowing to the brain. They also sharpen irritability and anxiety.
• Hunger keeps its own schedule. The hunger hormone ghrelin nearly doubles before each meal and falls within an hour of eating (Cummings and colleagues, 2001). Animal and small human studies suggest it partly learns habitual meal times, so a chaotic schedule sends hunger signals at random hours.
• Restriction invites overeating. The psychologists Janet Polivy and Peter Herman argued in 1985 that dieting and restraint tend to promote binge eating. The person who eats nothing all day often eats far past fullness at night.
• Late eating pulls on the clock. Meals act as time signals for the clocks in the liver and the gut. In animal studies, feeding at the wrong hours shifts those clocks away from the master clock in the brain.

The American Heart Association reviewed the evidence in 2017. It concluded that irregular eating patterns appear less favourable for heart and metabolic health, and that eating with deliberate attention to the timing and frequency of meals could help (St-Onge and colleagues, 2017).

The answer to broken meals is rhythm, and rhythm takes many forms: 3 meals, 2 meals, meals with snacks, or a set daily window of hours. No single pattern has proven best for everyone. Over 12 months, eating within an 8-hour window produced about the same weight loss as plain calorie control (Liu and colleagues, 2022). The evidence supports regularity, and a pattern that fits the person's life.

VI. Food and Mood

Food reaches the mind by several roads:

• Blood sugar. Steady fuel gives steady attention and patience. Swings in fuel bring swings in mood.
• Water. Losing about 1.4% of body weight in water lowered mood and concentration and raised headaches in young women, though most measures of cognitive performance held (Armstrong and colleagues, 2012).
• The gut. More than 90% of the body's serotonin is made in the gut, where it helps govern digestion (Yano and colleagues, 2015). That serotonin can't cross into the brain, yet the gut and brain stay in constant contact through the vagus nerve, hormones and the immune system, and the gut bacteria, which live on fibre, take part in that traffic.
• Caffeine and alcohol. Caffeine lifts alertness and, taken late, steals sleep. Alcohol relaxes at first and then breaks up the 2nd half of the night.
• Diet quality. Across observational studies, people who ate in the Mediterranean pattern, rich in vegetables, legumes, fish, olive oil and whole grains, had about a 33% lower risk of later depression (Lassale and colleagues, 2019). In a small trial of adults with major depression, 32% of those helped to improve their diet reached remission, against 8% in the comparison group (Jacka and colleagues, 2017).

Galen argued the same point in the 2nd century. In his treatise That the Faculties of the Soul Follow the Mixtures of the Body, he challenged anyone who doubted that food could make people more temperate or more licentious, more self-controlled or less, bolder or more timid, gentler or more quarrelsome, to come to him and learn what to eat and drink (Kühn IV 807 to 808).

None of this makes food a cure for serious depression or anxiety. Those belong with a doctor. Food sets the ground on which mood stands, and a broken diet makes every other difficulty harder to carry.

VII. The Body Clock and Broken Sleep

Hippocrates, Prognostic 10

περὶ δὲ ὕπνων, ὥσπερ κατὰ φύσιν ξύνηθες ἡμῖν ἐστι, τὴν μὲν ἡμέρην ἐγρηγορέναι χρή, τὴν δὲ νύκτα καθεύδειν. ἢν δὲ εἴη τοῦτο μεταβεβλημένον, κάκιον.

As for sleep, it's natural and customary for us to be awake by day and to sleep by night. If this is reversed, it's worse.

Hippocrates wrote this about the sick, reading their sleep as a sign of how an illness would turn. Modern chronobiology shows why the observation holds for most healthy people too.

A master clock in the brain, set mainly by light, keeps a rhythm of about 24 hours. Every organ carries a clock of its own. Together they time sleepiness and alertness, body temperature, hormones, digestion and repair.

2 forces decide when you sleep. Sleep pressure builds the longer you stay awake, as a substance called adenosine gathers in the brain. The body clock opens and closes the gate for sleep at its own hours. Sleep comes easily when both point the same way (Borbély, 1982). Caffeine works by blocking adenosine, which is why it masks tiredness without removing it.

Broken patterns set these 2 forces against each other:

• Social jet lag. Late nights and long lie-ins at the weekend, then early alarms on Monday, shift the clock back and forth every week. Researchers named this social jet lag, and it's associated with a higher body mass index (Roenneberg and colleagues, 2012).
• Weekend catch-up. Extra sleep at the weekend helps a little, but it doesn't undo a week of short nights. In a controlled study, people who slept short on weekdays and recovered at the weekend still saw their insulin sensitivity fall by about 9 to 27%, depending on the measure (Depner and colleagues, 2019).
• Living against the clock. When volunteers ate and slept out of step with their body clock, their blood sugar rose by 6% despite 22% more insulin, their satiety hormone leptin fell by 17%, and 3 of 8 showed blood sugar responses typical of prediabetes (Scheer and colleagues, 2009).
• Evening light. Bright screens late at night push the clock later. In 1 study, reading on a light-emitting tablet before bed cut the evening rise of the sleep hormone melatonin by about 55%, delayed it by more than 1.5 hours and left the readers less alert the next morning (Chang and colleagues, 2015).

Regular sleep protects health in its own right. In the large British cohort of Windred and colleagues, regularity predicted the risk of death better than the number of hours did (2024).

VIII. What Short Sleep Does

Sleep debt builds quietly. In a laboratory study, people held to 6 hours or less a night for 2 weeks slid into mental deficits as large as those caused by up to 2 nights of total sleep loss, while rating themselves only slightly sleepy (Van Dongen and colleagues, 2003). Many short sleepers believe they've adapted. The tests show otherwise.

The long-sleep finding needs care. Long sleep often signals an illness already present, which makes its own effect hard to separate. Hippocrates' warning still applies to both ends: sleep and sleeplessness are bad beyond measure.

IX. What Happens When Diet and Sleep Are Ignored

Nobody's health fails in a day. Broken meals and broken nights cost a little each time, and over years the costs add up to illness, exhaustion and a life that feels heavier than it should.

The 2 neglects feed each other. The tired person eats more and eats worse, and the poorly fed person sleeps worse, so each problem deepens the other.

A person who ignores both entirely often ends up with problems that look unrelated: arguments at home, mistakes at work, a body that keeps falling ill. The roots frequently lie in the daily rhythm, where nobody thinks to look.

X. The Evening, the Night and the Morning

These guidelines are indicative. They describe what helps most people sleep, and each person adapts them to their own life.

Alcohol deserves its own line. It helps people fall asleep faster, then breaks up the 2nd half of the night, and at high doses it also suppresses dreaming sleep early in the night (Ebrahim and colleagues, 2013). The relaxed start hides a poorer night.

XI. Exceptions and Personal Freedom

Hippocrates, Aphorisms I.17

δοτέον δέ τι καὶ τῷ ἔθει, καὶ τῇ ὥρῃ, καὶ τῇ χώρῃ, καὶ τῇ ἡλικίῃ.

Something must also be conceded to habit, to the season, to the country and to age.

Even in his rules for feeding the sick, Hippocrates left room for the person: their habits, the season, the land they live in and their age. The same holds for everyone reading this page.

• Athletes and heavy physical workers. Training raises the need for energy, carbohydrate, water and protein. Sports nutrition bodies place protein at 1.2 to 2.0 g per kg a day for athletes (Thomas and colleagues, 2016), and athletes often benefit from extra sleep. Stanford basketball players who extended their time in bed toward 10 hours ran faster sprints and shot about 9% more accurately (Mah and colleagues, 2011).
• Night people and night workers. Chronotype is partly inherited: a study of nearly 700,000 people found 351 genetic regions linked to being a morning person (Jones and colleagues, 2019). Evening types do better on later hours. Night workers can live well too, when their sleep hours stay fixed, the bedroom stays dark and their days off don't swing all the way back to daytime hours. Frequent switching between day and night schedules strains the body most, because the clock never settles.
• Natural short sleepers. Rare gene variants, in DEC2, ADRB1 and NPSR1 among others, let some people feel fully rested on about 4 to 6 hours (He and colleagues, 2009; Xing and colleagues, 2019). They're uncommon. Most people sleeping 5 hours who feel fine have adapted to tiredness, and testing shows their impairment.
• Age. Sleep needs fall from 14 to 17 hours in newborns to 7 to 8 hours in older adults (see the table below). Growing bodies need more food for their size, as Hippocrates observed.
• Pregnancy and breastfeeding. Energy needs rise, by about 340 kcal a day in the 2nd trimester and about 450 in the 3rd in the US Institute of Medicine's estimate. Iron needs rise too, and a doctor's guidance comes first.
• Plant-based and other chosen diets. Vegetarian, vegan and other diets chosen for personal, ethical or religious reasons can cover the body's needs, with attention to the nutrients they leave thin. Vitamin B12, for instance, comes almost only from animal foods, fortified foods or supplements.
• Illness, conditions and medication. Diabetes, kidney disease, digestive disease, allergies, sleep apnoea and many medications change the picture entirely. A specialist's guidance comes first.

National Sleep Foundation recommendations (Hirshkowitz and colleagues, 2015). Individuals vary on either side of these ranges.

Every person has the full right to eat and sleep as they choose. The Temple sets no rules on what anyone eats or when anyone sleeps, and it gives no religious weight to fasting or to sleeplessness. Freedom still has a measure, and here the measure is health. This page gives the knowledge. The choice belongs to each person.

XII. Signs You're Ready for the Advanced Level

• You meet most of the markers. You've held them for 2 months or more, through ordinary weeks and difficult ones.
• You can explain your own patterns. When your energy drops or your sleep breaks, you can usually say why.
• Balance comes without planning. Your meals cover the categories as a matter of habit.
• Your clock holds at the weekend. Saturday and Sunday run within an hour of the working week.
• You adapt the guidance. You've changed at least 1 guideline on these pages to fit your own body, and your notes show the change works.

Moving up is a choice. Some people stay at this level for good and live well on it. The Advanced Level sets out the ancient science of regimen in full, the micronutrients that govern energy and mood, meal timing, the architecture of sleep and the bond between diet, sleep and meditation. The Physical Exercise Intermediate Level runs alongside this page.

A regimen that runs on its own frees the mind for higher work.