Zevist Meditation · Diet & Sleep

Diet & Sleep: Advanced Level

updated by: High Priest Zevios Metathronos

The Advanced Zevist governs diet and sleep as part of the regimen of the soul. Here the ancient science of regimen meets modern physiology in full.

Level

Advanced

Diet Focus

Needs per category, meal timing and food's effect on the mind

Sleep Focus

Sleep architecture, the body clock and recovery

Daily Practice

Diet and sleep governed as part of the meditation regimen

Outcome

Self-government of the regimen

Approach

Indicative guidance, adapted to each person

Plato, Republic 571e

τὸ ἐπιθυμητικὸν δὲ μήτε ἐνδείᾳ δοὺς μήτε πλησμονῇ, ὅπως ἂν κοιμηθῇ καὶ μὴ παρέχῃ θόρυβον τῷ βελτίστῳ χαῖρον ἢ λυπούμενον

giving the appetite neither want nor surfeit, so that it goes to sleep and doesn't trouble the best part of the soul with its pleasure or its pain

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. The Regimen of the Advanced Zevist

At this level, diet and sleep stand beside meditation as governed parts of life. They no longer depend on mood, convenience or whatever happens to be nearby. The Advanced Zevist knows the measure of their own body and keeps it.

Xenophon, Memorabilia I.5.4, Socrates speaking

ἆρά γε οὐ χρὴ πάντα ἄνδρα, ἡγησάμενον τὴν ἐγκράτειαν ἀρετῆς εἶναι κρηπῖδα, ταύτην πρῶτον ἐν τῇ ψυχῇ κατασκευάσασθαι;

Shouldn't every man, holding self-mastery to be the foundation of virtue, first build it in his soul?

For Socrates, mastery over food, drink and sleep came first, because a person ruled by appetite can't rule anything else. The Advanced Level asks for that mastery, held firmly and without fanaticism. Mastery means the decision belongs to the person. It never means hunger as a virtue or sleeplessness as a trophy.

Bhagavad Gītā 6.16 to 17

नात्यश्नतस्तु योगोऽस्ति न चैकान्तमनश्नतः। न चातिस्वप्नशीलस्य जाग्रतो नैव चार्जुन॥
युक्ताहारविहारस्य युक्तचेष्टस्य कर्मसु। युक्तस्वप्नावबोधस्य योगो भवति दुःखहा॥

nātyaśnatas tu yogo 'sti na caikāntam anaśnataḥ | na cātisvapnaśīlasya jāgrato naiva cārjuna || yuktāhāravihārasya yuktaceṣṭasya karmasu | yuktasvapnāvabodhasya yogo bhavati duḥkhahā ||

Yoga isn't for the one who eats too much, nor for the one who doesn't eat at all, nor for the one given to too much sleep, nor for the one who stays awake, Arjuna. For the one measured in food and in recreation, measured in effort and in action, measured in sleep and in waking, yoga becomes the destroyer of sorrow.

The Indian teaching ties the measure of food and sleep directly to meditation. The Greek and the Indian witnesses arrive at the same law from the 2 ends of the ancient world, and the rest of this page sets out what that law means in the body.

II. The Outcome of This Level

The outcome of the Advanced Level is self-government of the regimen. You know your body's needs in each category of food, your own measure of sleep and the timing that suits you. Diet and sleep run steadily in support of meditation, and they hold up under travel, pressure and change.

The markers below are indicative. They describe a settled regimen, held over time.

This level has no end date. It describes a way of living kept over years.

III. The Ancient Science of Regimen

The Greek physicians built medicine on regimen before they built it on drugs. The Hippocratic treatise Regimen opens with the problem that every diet book since has tried to dodge:

Hippocratic Corpus, Regimen I.2

εἰ μὲν γὰρ ἦν εὑρετὸν ἐπὶ τούτοισι πρὸς ἑκάστην φύσιν σίτου μέτρον καὶ πόνων ἀριθμὸς σύμμετρος μὴ ἔχων ὑπερβολὴν μήτε ἐπὶ τὸ πλέον μήτε ἐπὶ τὸ ἔλασσον, εὕρητο ἂν ἡ ὑγείη τοῖσιν ἀνθρώποισιν ἀκριβῶς. νῦν δὲ τὰ μὲν προειρημένα πάντα εὕρηται, ὁκοῖά ἐστι, τοῦτο δὲ ἀδύνατον εὑρεῖν.

If it were possible to find, for each person's constitution, a measure of food and a matching amount of exercise with no excess either way, neither more nor less, then health would have been discovered for mankind exactly. As things stand, everything described above has been found, but this is impossible to find.

The Hippocratic author saw the limit 24 centuries ago. A universal measure of food can't be written, because constitutions differ. Every honest page on diet, this one included, works within that limit: it can set out the principles, and the exact measure belongs to each person, found by observation and, where health requires it, with a specialist.

Hippocratic Corpus, On Ancient Medicine 20

ὅ τί τέ ἐστιν ἄνθρωπος πρὸς τὰ ἐσθιόμενά τε καὶ πινόμενα καὶ ὅ τι πρὸς τὰ ἄλλα ἐπιτηδεύματα, καὶ ὅ τι ἀφ’ ἑκάστου ἑκάστῳ συμβήσεται

what a human being is in relation to what he eats and drinks and to his other habits, and what will happen to each person from each thing

On Ancient Medicine names this as the knowledge a physician must hold. For the person governing their own regimen, it's the same knowledge turned inward: what each food, each hour of sleep and each habit does to you in particular.

Hippocrates, Aphorisms I.14

τὰ αὐξανόμενα πλεῖστον ἔχει τὸ ἔμφυτον θερμόν· πλείστης οὖν δεῖται τροφῆς· εἰ δὲ μή, τὸ σῶμα ἀναλίσκεται· γέρουσι δὲ ὀλίγον τὸ θερμόν, διὰ τοῦτο ἄρα ὀλίγων ὑπεκκαυμάτων δέονται· ὑπὸ πολλῶν γὰρ ἀποσβέννυται.

Growing bodies have the most innate heat, so they need the most food; otherwise the body wastes away. The old have little heat, so they need little fuel, for much fuel puts the flame out.

The Greeks adjusted regimen to age, as above, and to the season: the Hippocratic Regimen in Health advises more food and less drink in winter, and the reverse in summer. Galen later gathered the whole field into the factors a person governs every day: the air, food and drink, motion and rest, sleep and waking, what the body takes in and expels, and the passions of the soul.

India reached the same structure on its own path. The Caraka Saṃhitā, the foundational text of Āyurveda, names 3 supports of life, and 2 of them are the subject of this page:

Caraka Saṃhitā, Sūtrasthāna 11.35

त्रय उपस्तम्भा इति आहारः, स्वप्नो, ब्रह्मचर्यमिति

traya upastambhā iti āhāraḥ, svapno, brahmacaryam iti

The supports are 3: food, sleep and brahmacarya, the disciplined conduct of life.

Aristotle, in On Sleep and Waking, held that sleep exists for the preservation of living things, as the rest that every moving being needs (455b). He traced sleep itself to digestion:

Aristotle, On Sleep and Waking 3, 456b

ἐκ τῆς περὶ τὴν τροφὴν ἀναθυμιάσεως γίνεται τὸ πάθος τοῦτο

this affection arises from the evaporation that attends nourishment

Physiology has since replaced Aristotle's rising vapour with hormones and nerve signals. His observation stands: food and sleep are bound together, and a heavy meal pulls the body toward sleep.

A famous misquotation. The line "Let food be thy medicine and medicine be thy food" appears on countless pages under the name of Hippocrates. It occurs nowhere in the Hippocratic Corpus. Diana Cárdenas traced it in 2013 and found it a modern literary creation: for the Hippocratic physicians, food and medicine stayed distinct (Cárdenas, 2013). The nearest Hippocratic line, in Nutriment 19, concerns purging. The Hippocratic regimen treated food as the ground of health and kept drugs as a separate art.

IV. Energy and the Categories in Depth

Every category of food except water, vitamins and minerals carries energy. Protein and carbohydrate give about 4 kcal per gram, fat about 9, alcohol about 7 and fibre about 2 (FAO, 2003). Bodyweight follows the balance between energy taken in and energy spent, over weeks and months.

• Protein. Built from 20 amino acids, 9 of which the body can't make and must take from food. Animal proteins carry all 9 in good proportion. Plant proteins usually cover them well when several sources are combined across the day, legumes with grains for instance. The adult reference sits at 0.8 to 0.83 g per kg of bodyweight a day. Sports bodies place athletes at 1.2 to 2.0 g (Thomas and colleagues, 2016; Jäger and colleagues, 2017), and an expert group on older adults advises at least 1.0 to 1.2 g after 65 to protect muscle (Bauer and colleagues, 2013). Calorie for calorie, protein also satisfies hunger more than the other categories.
• Carbohydrate. Sugars, starches and fibre. The brain alone uses about 20% of the body's resting energy, most of it as glucose. Starches in whole grains, legumes and roots release glucose slowly, while sugars and refined flour release it fast. The WHO places free sugars, meaning those added to food plus those in honey, syrups and juices, under 10% of energy, with further benefit under 5%.
• Fat. 2 fatty acids are essential: linoleic acid, an omega-6, and alpha-linolenic acid, an omega-3. The long-chain omega-3s EPA and DHA, found mostly in oily fish and algae, build the membranes of brain cells and the retina. Saturated fats raise LDL cholesterol when they dominate the diet, and industrial trans fats do the most harm of all.
• Fibre. Fibre feeds the bacteria of the large gut, which ferment it into short-chain fatty acids. These nourish the gut wall and send signals to the immune system and beyond. Many adults in Western countries eat less than the 25 g reference.
• Water. The EFSA figures of 2.0 L a day for women and 2.5 L for men count water from all drinks and food. In the US estimate, about 20% of total water typically comes from food. Heat, altitude, training and illness all raise the need.

The categories also work on each other. Fat carries vitamins A, D, E and K into the body. Vitamin C helps the iron from plants absorb. Fibre slows the sugar released from starch. Protein and fat slow the emptying of the stomach and stretch the steady energy of a meal. A balanced meal does more than the sum of its parts.

V. Micronutrients, Energy and Mood

Several vitamins and minerals act directly on energy and mood. A shortage often shows first as tiredness and low spirits, long before any visible sign.

Iron deficiency is the most common nutritional disorder in the world, and the anaemia it causes can cut physical work capacity by as much as 30% (WHO, 2001). Vitamin D tells a seasonal story: in Boston, at 42° north, winter sunlight from November to February makes no vitamin D in the skin at all (Webb and colleagues, 1988), and much of Europe lies further north.

Supplements have their place where a shortage is proven, and a blood test with a doctor is the way to prove it. High doses taken blindly do harm of their own: iron, vitamin A and vitamin D are all toxic in excess.

VI. Meal Timing, Fasting and the Body Clock

The body handles the same meal differently at different hours. Glucose tolerance and insulin sensitivity are generally better earlier in the day (Poggiogalle and colleagues, 2018), and the clocks of the liver, gut and pancreas take their timing partly from meals. In animal studies, feeding restricted to the wrong hours shifts the liver's clock away from the master clock in the brain (Damiola and colleagues, 2000). The young field that studies this is called chrononutrition.

• Hunger learns the schedule. The hunger hormone ghrelin nearly doubles before each meal and falls to its low within an hour after (Cummings and colleagues, 2001). Animal and small human studies suggest it partly entrains to habitual meal times, which helps explain why a regular schedule calms hunger and a chaotic one scatters it.
• Late eating. In a 20-week weight-loss programme in Spain, people who ate lunch, their main meal, after 3 pm lost less weight and lost it more slowly than early eaters (Garaulet and colleagues, 2013). The study was observational, so it shows an association rather than a proven cause.
• Misalignment. Eating and sleeping out of step with the body clock raised blood sugar and lowered the satiety hormone leptin even in healthy adults (Scheer and colleagues, 2009).
• Time-restricted eating. Over 12 months, people eating within an 8-hour window lost 8.0 kg against 6.3 kg with calorie restriction alone, a difference too small to be statistically significant (Liu and colleagues, 2022). A 12-week trial of 16-hour daily fasting found no advantage over ordinary meal timing (Lowe and colleagues, 2020).

Fasting, then, is a tool that some people choose and use well. It holds no special virtue, and the Temple gives it no religious weight. Nobody here is told to fast for holiness. The difference that matters lies between a pattern chosen and kept and a pattern that breaks by accident. The 1st trains the body's clocks. The 2nd confuses them.

VII. Food and the Mind

Plato, Timaeus 73a, on the coiling of the intestines

ὅπως μὴ ταχὺ διεκπερῶσα ἡ τροφὴ ταχὺ πάλιν τροφῆς ἑτέρας δεῖσθαι τὸ σῶμα ἀναγκάζοι, καὶ παρέχουσα ἀπληστίαν, διὰ γαστριμαργίαν ἀφιλόσοφον καὶ ἄμουσον πᾶν ἀποτελοῖ τὸ γένος, ἀνυπήκοον τοῦ θειοτάτου τῶν παρ’ ἡμῖν.

so that food wouldn't pass through quickly and force the body to need more food at once, breeding insatiability, and through gluttony make the whole race unphilosophical and unmusical, disobedient to the most divine part within us

Plato read the long, coiled gut as a design for freedom. Food lingers, so the mind isn't forced back to eating every hour. A body kept grazing all day, or swinging between starvation and gorging, keeps the mind tied to the stomach.

Modern physiology describes the same bond through the gut-brain axis. The gut carries its own nervous system of hundreds of millions of neurons and talks to the brain through the vagus nerve, hormones and the immune system. More than 90% of the body's serotonin is made in the gut, mainly by its enterochromaffin cells, and in mice the gut bacteria regulate much of that production (Yano and colleagues, 2015). Gut serotonin can't cross into the brain, so its influence on mood runs through these indirect channels.

Processing changes how much people eat. In a strictly controlled inpatient trial, volunteers offered ultra-processed meals ate about 500 kcal a day more than when offered unprocessed meals matched for sugar, fat, fibre and salt, and gained 0.9 kg in 2 weeks (Hall and colleagues, 2019). Across observational studies, a Mediterranean pattern of eating carried about a 33% lower risk of later depression (Lassale and colleagues, 2019).

Bhagavad Gītā 17.8

आयुःसत्त्वबलारोग्यसुखप्रीतिविवर्धनाः। रस्याः स्निग्धाः स्थिरा हृद्या आहाराः सात्त्विकप्रियाः॥

āyuḥsattvabalārogyasukhaprītivivardhanāḥ | rasyāḥ snigdhāḥ sthirā hṛdyā āhārāḥ sāttvikapriyāḥ ||

Foods that increase life, vitality, strength, health, happiness and contentment, that are savoury, rich, sustaining and pleasing to the heart, are dear to the sattvic.

The Gītā sorts foods by what they do to the mind: some bring clarity and vigour, others agitation, others dullness. The method carries the lesson. Judge a food by its effect on you, in the hours after the meal and in the days after a habit.

Galen, That the Faculties of the Soul Follow the Mixtures of the Body 9 (Kühn IV 808)

ἡκέτωσαν πρός με μαθησόμενοι, τίνα μὲν ἐσθίειν αὐτοὺς χρή, τίνα δὲ πίνειν.

Let them come to me and learn what they should eat and what they should drink.

Galen addressed this to the doubters who resented the claim that food could make some people more temperate and others more licentious, some bolder and others more timid, some gentle and others quarrelsome. He promised that a right regimen would also make people sharper, better at remembering, keener to learn and more prudent.

VIII. The Architecture of Sleep

Homer, Iliad 14.233, Hera addressing Hypnos

Ὕπνε ἄναξ πάντων τε θεῶν πάντων τ’ ἀνθρώπων

Sleep, lord of all Gods and of all men

Homer names Hypnos the brother of Death (Iliad 14.231) and the lord of Gods and men alike. Pausanias saw an altar at Troezen where Hypnos was worshipped together with the Muses, as the God dearest to them (Description of Greece 2.31.3).

Sleep runs in cycles of about 90 minutes, repeated 4 to 6 times a night. Each cycle passes from light sleep into deep slow-wave sleep and then into REM sleep, the stage of vivid dreams. Deep sleep fills the early cycles, and REM grows longer toward morning. Cutting the night short at either end costs a different kind of sleep.

Deep sleep declines with age. In the men studied by Van Cauter and colleagues, it fell from about 19% of the night at ages 16 to 25 to about 3% at 36 to 50, and growth hormone release fell with it (2000).

In mice, sleep widened the spaces between brain cells by about 60% and sped the clearing of waste such as beta-amyloid (Xie and colleagues, 2013). A 2024 study found reduced clearance during sleep instead (Miao and colleagues, 2024), so the mechanism remains under debate. The dependence of memory, mood and metabolism on sleep is beyond dispute.

Caraka Saṃhitā, Sūtrasthāna 21.36

निद्रायत्तं सुखं दुःखं पुष्टिः कार्श्यं बलाबलम्। वृषता क्लीबता ज्ञानमज्ञानं जीवितं न च॥

nidrāyattaṃ sukhaṃ duḥkhaṃ puṣṭiḥ kārśyaṃ balābalam | vṛṣatā klībatā jñānam ajñānaṃ jīvitaṃ na ca ||

Happiness and misery, nourishment and wasting, strength and weakness, virility and impotence, knowledge and ignorance, life and its end: all depend on sleep.

Egypt told the same truth through Ra. Each night the barque of the Sun crosses the Duat, and each dawn the God rises renewed. Sleep is the body's nightly passage through its own Duat. Under Ma'at, the cells die, live and are reborn in order, and the body rises repaired. Deny it that passage night after night and the body's order drifts toward Izfet, toward dissolution and disease.

IX. Broken Sleep in Depth

Plato, Laws 808b to c

ὕπνος γὰρ δὴ πολὺς οὔτε τοῖς σώμασιν οὔτε ταῖς ψυχαῖς ἡμῶν οὐδ’ αὖ ταῖς πράξεσιν ταῖς περὶ ταῦτα πάντα ἁρμόττων ἐστὶν κατὰ φύσιν. καθεύδων γὰρ οὐδεὶς οὐδενὸς ἄξιος, οὐδὲν μᾶλλον τοῦ μὴ ζῶντος· ἀλλ’ ὅστις τοῦ ζῆν ἡμῶν καὶ τοῦ φρονεῖν μάλιστά ἐστι κηδεμών, ἐγρήγορε χρόνον ὡς πλεῖστον, τὸ πρὸς ὑγίειαν αὐτοῦ μόνον φυλάττων χρήσιμον, ἔστιν δὲ οὐ πολύ, καλῶς εἰς ἔθος ἰόν.

Much sleep suits neither our bodies nor our souls nor the work that concerns them. Nobody asleep is worth anything, any more than the dead. Whoever cares most for living and for thinking stays awake as long as he can, keeping only as much sleep as is useful for his health, and that isn't much once it's well made into a habit.

Plato wrote against excess sleep, and he set the limit at health. Hippocrates warned against both extremes. Modern epidemiology draws the same curve: across more than 1.3 million people, habitually short sleep carried a 12% higher risk of death and habitually long sleep a 30% higher risk (Cappuccio and colleagues, 2010). Long sleep often reflects an illness already present, while short sleep does damage of its own.

• Sleep debt. 2 weeks at 6 hours or less a night produced mental deficits as large as up to 2 nights of total sleep loss, while the sleepers rated themselves only slightly sleepy (Van Dongen and colleagues, 2003). The impaired brain misjudges its own impairment.
• Recovery sleep. Weekend lie-ins don't repay a working week of short nights. In a controlled study, the weekend recovery group still lost about 9 to 27% of insulin sensitivity, depending on the measure, and their body clocks drifted later (Depner and colleagues, 2019).
• Shift work. The International Agency for Research on Cancer classifies night shift work as probably carcinogenic to humans (Group 2A), on limited evidence in humans and stronger animal and mechanistic evidence (IARC, 2019). Night work stays a valid way to live and earn. It asks for more care: fixed hours where possible, a dark bedroom, light managed deliberately and attention to the rest of the regimen.
• Alcohol. It shortens the time to fall asleep and deepens the 1st half of the night, then disrupts the 2nd half. At high doses it also cuts dreaming sleep early in the night (Ebrahim and colleagues, 2013).
• Sleep apnoea. In obstructive sleep apnoea the airway closes again and again during sleep, breaking the night without the sleeper knowing. Loud snoring, gasping, morning headaches and heavy daytime sleepiness point to it. It needs a doctor, because untreated it raises blood pressure and heart risk.
• Chronic insomnia. Trouble sleeping at least 3 nights a week for 3 months or more counts as chronic insomnia. Clinical guidelines place cognitive behavioural therapy for insomnia ahead of sleeping pills as the first treatment (Qaseem and colleagues, 2016).

X. The Long Arc of Neglect

Ignored for a season, diet and sleep cost mood and energy. Ignored for decades, they shape the whole course of a life.

The 2 neglects multiply each other. Short sleep raises hunger and cravings. Poor food and late meals worsen sleep. Tiredness and low mood weaken the will to change either. Left alone, the cycle tightens year by year.

In the language of the Temple, this is Izfet at the scale of a single life: order lost a little at a time, until disorder feels normal. Ma'at returns the same way it left, a little at a time, through rhythm kept daily. Hippocrates gave the method in Aphorisms II.51: every sudden excess is hostile to nature, and what goes little by little is safe.

XI. Diet, Sleep and the Meditating Mind

Patañjali, Yoga Sūtra 1.30

व्याधिस्त्यानसंशयप्रमादालस्याविरतिभ्रान्तिदर्शनालब्धभूमिकत्वानवस्थितत्वानि चित्तविक्षेपास्तेऽन्तरायाः॥

vyādhistyānasaṃśayapramādālasyāviratibhrāntidarśanālabdhabhūmikatvānavasthitatvāni cittavikṣepās te 'ntarāyāḥ

Sickness, dullness, doubt, carelessness, sloth, craving, false perception, failure to reach a stage, and instability: these distractions of the mind are the obstacles.

Patañjali places sickness, dullness and sloth among the first obstacles to meditation. All 3 grow readily in a body that's badly fed or badly rested.

Plato, Republic 572a to b

ἀλλ’ ἡσυχάσας μὲν τὼ δύο εἴδη, τὸ τρίτον δὲ κινήσας ἐν ᾧ τὸ φρονεῖν ἐγγίγνεται, οὕτως ἀναπαύηται, οἶσθ’ ὅτι τῆς τ’ ἀληθείας ἐν τῷ τοιούτῳ μάλιστα ἅπτεται καὶ ἥκιστα παράνομοι τότε αἱ ὄψεις φαντάζονται τῶν ἐνυπνίων.

having quieted those 2 parts and stirred the 3rd, where wisdom arises, he goes to his rest. You know that in such a state he grasps truth most of all, and the visions of his dreams are least lawless.

Plato's evening practice for the soul runs in 4 steps: wake the reasoning part with good thoughts, give the appetite neither want nor surfeit, calm the spirited part, then sleep. Such a sleeper, he says, touches truth in the night and dreams cleanly. The Greeks took that night seriously. At Epidaurus and the other sanctuaries of Asclepius, the sick slept in the ἄβατον to receive healing dreams from the God, a rite called ἐγκοίμησις.

For the practice itself, these points serve most people. Adapt each one to yourself:

• Before meditation. Sessions tend to run clearest when the stomach is neither empty to the point of hunger nor full: for many people about 2 to 3 hours after a full meal, or about 1 hour after a light one.
• Morning and evening sessions. Morning practice draws on the night's sleep. Evening practice closes the day and can lead into sleep, though some energising practices are better kept away from bedtime if they leave you wide awake.
• Drowsiness in practice. Sleepiness during meditation signals sleep debt more often than a weak will. The answer usually lies in the previous nights.
• Hunger and focus. Some people find light hunger sharpens their focus, while others find it scatters it. Your notes will show which you are. The Temple prescribes neither.

XII. Exceptions, Constitutions and Freedom

Hippocrates, Aphorisms I.3

ἐν τοῖσι γυμναστικοῖσιν αἱ ἐπ’ ἄκρον εὐεξίαι σφαλεραί, ἢν ἐν τῷ ἐσχάτῳ ἔωσιν· οὐ γὰρ δύνανται μένειν ἐν τῷ αὐτέῳ, οὐδὲ ἀτρεμέειν· ἐπεὶ δὲ οὐκ ἀτρεμέουσιν, οὐδ’ ἔτι δύνανται ἐπὶ τὸ βέλτιον ἐπιδιδόναι, λείπεται ἐπὶ τὸ χεῖρον.

In athletes, a peak condition is dangerous when it reaches the extreme. It can't stay where it is or stand still, and since it can't stand still and can't improve further, the only way left is toward the worse.

• Athletes. When training outruns food, athletes fall into what the International Olympic Committee calls Relative Energy Deficiency in Sport: impaired physical and psychological function caused by prolonged or severe low energy availability, touching hormones, bones, immunity, mood and performance (Mountjoy and colleagues, 2023). Athletes need more energy, more carbohydrate around training, 1.2 to 2.0 g of protein per kg and often more sleep. Hippocrates' warning stands beside the science: the extreme peak can't hold. The Temple's physical training aims at healthy people, never at hyper-athletes.
• Nocturnal people. Chronotype is partly written in the genes, with 351 genetic regions linked to morning or evening preference (Jones and colleagues, 2019). A night person on a fixed schedule with protected sleep lives a regular pattern, and a regular pattern differs entirely from a broken one. Light does the most work here: bright light at the start of the person's own day and darkness through their night.
• Natural short sleepers. Carriers of a DEC2 variant slept about 6.25 hours against 8.06 in their non-carrier relatives (He and colleagues, 2009). Variants in ADRB1 and NPSR1 produce people who sleep 4 to 6 hours and still wake rested (Shi and colleagues, 2019; Xing and colleagues, 2019). These variants are rare. The usual signs of a true short sleeper are a lifelong pattern, waking rested without caffeine and no need for catch-up sleep at weekends.
• Long sleepers. The American Academy of Sleep Medicine notes that more than 9 hours a night may suit young adults, people recovering from sleep debt and people who are ill (Watson and colleagues, 2015).
• Age. Children and teenagers need the most sleep and, for their size, the most food. Deep sleep shrinks with age, and older people often sleep earlier and more lightly. Energy use adjusted for body size holds steady from about 20 to 60 and then falls by about 0.7% a year, so people in their 90s burn about 26% less than in midlife, adjusted for their size (Pontzer and colleagues, 2021). Appetite often falls with it, while protein needs per kg rise.
• Women's cycles, pregnancy and breastfeeding. Menstruation raises iron needs, and pregnancy raises energy needs, by about 70, 260 and 500 kcal a day across the 3 trimesters in the EFSA estimate, with about 500 more during breastfeeding. A doctor's guidance comes first.
• Genetics of digestion. The ability to digest milk sugar in adulthood varies widely between populations and families. The speed at which the liver clears caffeine varies several-fold between people, which is why the same evening coffee ruins 1 person's night and leaves another untouched.
• Chosen diets. Vegetarian, vegan, religious and other chosen diets can meet the body's needs with attention to what they leave thin: vitamin B12, iron, iodine and the long-chain omega-3s, depending on the diet.
• Illness and medication. Diabetes, kidney and liver disease, coeliac disease, allergies, eating disorders, sleep disorders and many medications change everything on this page. A specialist's guidance comes first.

Zevism isn't a medical facility, and spiritual practice can't replace the treatment of an illness of the body or the mind. The Temple doesn't stigmatise any health condition. It commends those who have sought a diagnosis and manage their condition, because that awareness is the first step to managing it well.

Hippocrates conceded part of every regimen to habit, season, country and age, and the Pythagoreans defined measure as whatever doesn't distress the person. The Temple follows both. Every person decides how they eat and how they sleep. The Temple sets no rules on either, gives no religious weight to fasting or to sleeplessness, and offers this knowledge so that each person can govern their own regimen well.

XIII. The Body Upholds the Soul

Health doesn't change anyone's spiritual trajectory. The soul's path runs through Meditation, Ethics, a life lived toward ὁμοίωσις θεῷ and Theurgy, and a tired or poorly fed body doesn't lower anyone's place on it.

Yet a body fed in measure and rested in rhythm upholds the soul better. The energy of meditation builds on it, long sessions run clear, and the mind stays free for higher work in place of the body's complaints.

Plato's sleeper gives the appetite neither want nor surfeit and touches truth in the night. The yogi measured in food and sleep finds the yoga that destroys sorrow. The Hippocratic physician placed health in a measure of food and labour fitted to each constitution. The 3 witnesses agree: when the regimen is governed, the soul works from a steady vessel.

The Physical Exercise Advanced Level completes the regimen of the body, and the Meditation section carries the work it serves.

Measure in food and rhythm in sleep: on that ground the soul does its highest work.