Guide: Leben mit den vier Jahreszeiten

Across nearly 250,000 people, blood pressure, cholesterol and waistlines all sat higher in the cold months than in summer. The body runs on a yearly cycle, and classical Chinese medicine built a way of living around that cycle centuries before anyone measured it.

The Classical Frame

春夏養陽，秋冬養陰 (chūn xià yǎng yáng, qiū dōng yǎng yīn): nourish yang in spring and summer, nourish yin in autumn and winter. (Huangdi Neijing, Su Wen, chapter 2, "The Great Treatise on Attuning the Spirit to the Four Seasons.")

Classical Chinese medicine works with five seasons, not four. The Five Elements pair with them in a fixed order, and that pairing is where the counsel for each part of the year comes from. Spring belongs to Wood and the Liver, its character upward and outward. Summer belongs to Fire and the Heart, the season of maximum yang. Between summer and autumn sits a fifth season, late summer, belonging to Earth and the Spleen and tied to digestion. Autumn belongs to Metal and the Lung, the turn toward conserving. Winter belongs to Water and the Kidney, the season of storage, when the body banks the deep essence it will spend come spring.

What Modern Biology Shows

The Research & Studies

Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.

Heart And Vascular

Blood pressure runs about 3 mmHg higher in winter than summerModerate · risk

In plain terms

Blood pressure, cholesterol and waistlines tend to run a little higher in winter than in summer. Across nearly a quarter of a million people, winter blood pressure was about 3 points higher on the top number, which is part of why heart trouble clusters in the cold months.

In detail

In a pooled cross-sectional analysis of 237,979 participants from 24 studies across 15 countries, cardiovascular risk factors showed a consistent seasonal pattern of higher levels in winter and lower in summer, in both hemispheres. The northern-hemisphere winter-to-summer differences were 2.9 mmHg systolic and 1.4 mmHg diastolic blood pressure, 0.26 kg/m2 body-mass index, 0.24 inches (0.6 cm) waist circumference, 3.9 mg/dL (0.10 mmol/L) total cholesterol, 4.3 mg/dL (0.11 mmol/L) LDL cholesterol and 1.3 mg/dL (0.07 mmol/L) glucose. Because it compares different people measured in different seasons, not following individuals, it describes a population pattern, not proving that season drives an individual's numbers.

How to use it

Winter is the season to hold the line on the ordinary levers, not let them slip: keep moving on the cold, dark days, keep meals steady, and if your blood pressure is monitored, expect it to read a touch higher in the cold and read the trend across the year, not a single winter measurement.

The study · 1

Marti-Soler et al., seasonality of cardiovascular risk factors across 15 countries · Heart 2014;100(19):1517-23

Daylight and temperature move blood pressure as two independent signalsEmerging · mixed

In plain terms

Blood pressure does not only follow the cold; it also follows the length of the day. In people wearing temperature sensors, warmer skin temperature came with lower daytime pressure, and longer daylight hours came with different night-time and early-morning pressure, with temperature and daylight each mattering on their own.

In detail

Bei 1,897 Patienten, die während 24-Stunden-ambulanter Blutdruckmessung persönliche Umgebungstemperatur-Logger trugen, fanden multivariate Modelle, adjustiert für Alter, Geschlecht, Körpermasse, Behandlung und Tageslichtstunden, dass der systolische Tagesdruck negativ mit der persönlichen Temperatur zusammenhing (-0.14 mmHg pro Einheit; 95%-KI -0.25 bis -0.02), der Nachtdruck positiv mit den Tageslichtstunden (0.63; 0.37 bis 0.90) und der morgendliche Druckanstieg negativ mit den Tageslichtstunden (-0.54; -0.87 bis -0.21). Die Autoren kamen zu dem Schluss, dass persönliche Temperatur und Saisonalität, ausgedrückt als Tageslichtstunden, zwei unabhängige Prädiktoren des ambulanten Blutdrucks sind. Es handelt sich um Beobachtungsdaten, sie belegen also Assoziation, keine Kausalität.

How to use it

This is the measurable core of what the tradition means by living with the light: daylight length has a real physiological signature. Treat it as one more reason to get outdoor light through the year, and, if you track blood pressure, to expect seasonal drift, not a fixed number.

The study · 1

Modesti et al., seasonal blood-pressure changes track temperature and daylight hours independently · Hypertension 2013;61(4):908-14

Mood & stress

Helles Licht hebt Winterdepression, mit etwa 40 % mehr ansprechenden MenschenModerate

In plain terms

Bei Winterdepression hilft das morgendliche Sitzen vor einer hellen Lichttherapie-Lampe an den meisten Tagen mehr als ein Scheinlicht. In gepoolten Studien war die Wahrscheinlichkeit anzusprechen um etwa 40 % höher, ein kleiner bis mittlerer Nutzen, der klar in eine Richtung weist.

In detail

Diese Metaanalyse fasste 19 randomisierte kontrollierte Studien zu heller Lichttherapie bei saisonal abhängiger Depression zusammen, mit 610 Patienten, die zu Depressionswerten beitrugen, und 559, die zu Ansprechdaten beitrugen. Helles Licht war Placebo überlegen, mit einer standardisierten Mittelwertdifferenz von -0.37 (95%-KI -0.63 bis -0.12) bei Depressionswerten und einem Risk Ratio von 1.42 (95%-KI 1.08 bis 1.85) für das Ansprechen auf die Behandlung. Die Autoren wiesen auf moderate Heterogenität, kleine bis mittlere Stichprobengrößen und moderates bis hohes Verzerrungsrisiko hin und forderten größere, hochwertigere Studien, weshalb der Befund bei moderat, nicht stark liegt.

How to use it

Wenn Ihre Stimmung während der dunklen Monate sinkt, ist eine morgendliche Routine mit hellem Licht der am besten getestete erste Schritt und kostet wenig, um es zu versuchen. Nutzen Sie es früh am Tag, damit der Zeitpunkt mit Ihrer inneren Uhr übereinstimmt, und behandeln Sie es als saisonales Werkzeug, das Sie beginnen, wenn die Nächte länger werden, nicht als etwas, das Sie erst starten, sobald der Winter vollständig eingesetzt hat.

The study · 1

Pjrek et al., efficacy of light therapy in seasonal affective disorder, meta-analysis of RCTs · Psychother Psychosom 2020;89(1):17-24

Sleep

Winterschlaf dauert bis zu 60 Minuten länger, mit etwa 30 Minuten mehr REMEmerging · mixed

In plain terms

Menschen schlafen im Winter tendenziell etwas länger und bekommen mehr Traum- (REM-)Schlaf als im Frühling oder Sommer. In einer einjährigen Klinikstudie dauerte der Winterschlaf bis zu eine Stunde länger, wobei nur die REM- und Tiefschlafveränderungen statistisch gesichert waren.

In detail

In einer retrospektiven Analyse dreinächtiger Polysomnographie aus einer Berliner neuropsychiatrischen Schlafklinik wurden 188 Patienten (Durchschnittsalter 46.6, 52 % weiblich, behandelt wegen Insomnie, Depression oder Atemstörungen) monatlich über das Jahr gemittelt. Die gesamte Schlafzeit war im Winter bis zu 60 Minuten länger als im Sommer, jedoch nicht statistisch signifikant; der REM-Schlaf war im Winter etwa 30 Minuten länger als im Frühling (p = 0.009, etwa 5 % der gesamten Schlafzeit, p = 0.011); die REM-Latenz war im Herbst etwa 25 Minuten kürzer als im Frühling (p = 0.010); und der Tiefschlaf (Slow-Wave-Schlaf) war im Herbst 30 bis 50 Minuten kürzer, signifikant als Prozentsatz der Gesamtschlafzeit (ein relativer Rückgang von etwa 10 %, p = 0.017). Die Stichprobe war klinisch, nicht gesund, der Effekt bei unbelasteten Schläfern ist also nicht belegt.

Who this may not transfer to:Measured in adults already seeking help for disturbed sleep, so the size of the seasonal shift in healthy sleepers is not established here.

How to use it

Verstehen Sie dies als Erlaubnis, den Winterschlaf länger sein zu lassen, statt ihn auf einen Sommerzeitplan zurückzudrängen. Wenn sich Ihre Erholung in den dunklen Monaten verschlechtert, statt sich nur zu verlängern, ist das der Punkt, an dem Sie am Lichtzeitpunkt und an den Schritten im Insomnie-Ratgeber arbeiten sollten.

The study · 1

Seidler et al., seasonality of human sleep from clinic polysomnography · Front Neurosci 2023;17:1105233

Four findings stand out:

• Winter is the higher-risk cardiovascular season. A pooled study of nearly 250,000 people found cholesterol, waistlines and blood pressure all above their summer levels. Cold-month habits push the same way: less activity, heavier meals, more time indoors.
• Daylight length follows blood pressure more closely than temperature does, across the same 15-country group.
• Winter sleep runs longer and holds more dream (REM) sleep, tracked in adults across a full 12 months.
• For people whose mood drops in the dark months, roughly 40 percent more responded to morning bright light than to a dummy light.

Where the Two Lenses Meet

Human physiology is seasonal, measured and confirmed. The timetable that assigns each season an organ is a frame for arranging attention through the year. Daylight is the reliable signal; treat the classical schedule as a lens on it.

Circadian entrainment is the shared mechanism. Daylight sets the body clock, and blood pressure, sleep and mood all follow that one yearly signal.

The element-and-organ pairings are a way of organizing attention. No study has measured them as a schedule the body keeps.

The tradition reached this picture by watching the year for centuries. Modern research, starting from measurement, keeps landing in the same place, the body clock, blood pressure, and sleep and mood all moving with the light.

Living With the Seasons

Spring: come out of winter gradually. Move your mornings earlier, loosen up with mobility work and walking outdoors, and take a daily dose of morning light to meet the lengthening day.

Summer: use the long evenings for activity and company. Stay ahead on fluids, and stay in tune with your own tolerance for heat.

Late summer: keep an unhurried pace, and take a short walk after eating to steady digestion.

Autumn: start moving your bedtime earlier, and get deliberate about evening light and screens before the dark months arrive.

Winter: give yourself more sleep and keep warm, and lean on morning light, the most useful winter habit on this site. If your mood drops through the dark months, the depression guide lays out the bright-light routine. If winter unsettles your sleep instead of lengthening it, start with sleep regularity and steady light timing.

Pick one adjustment for the season you are in, and let it settle before adding another, the way what to do first suggests for any change.

Go Deeper

• Yang Sheng, the fuller art of nourishing life across the day and the year.
• Morning light, the winter mood-and-clock lever.
• Circadian entrainment, how daylight sets the body clock.
• Sleep regularity: steadying sleep when the season disrupts it.
• Depression, the seasonal-mood guide and its light routine.
• Hypertension: winter blood pressure in depth.

Common Questions

Is there anything to seasonal eating?

Yes, in the ordinary sense, even without a trial to prove it. Western research has not run a clean study of seasonal eating as such, so it stands as sound traditional practice that also fits modern nutrition. Build meals around whole food and let what is fresh and local shape them. The classical pattern runs lighter and fresher in spring, cooling and watery in summer, and simple and warm through late summer to protect digestion. In autumn it turns moistening against the dry air, and in winter warming and nourishing with roots, broths and stews.

Why is blood pressure higher in winter?

Across 237,979 people, winter blood pressure ran about 2.9 mmHg higher on the top (systolic) number than in summer, with cholesterol and waistlines a little higher too. Part of it is behavior: less activity, heavier eating, more time indoors. Because cold pushes blood pressure up, keeping warm and holding the basics (movement, steady meals) matters more in winter than in summer.

Do we really sleep more in winter?

In a year-long clinic study of 188 adults, winter total sleep ran up to 60 minutes longer than summer, though that gap did not reach statistical significance. Dream (REM) sleep was the reliable part: about 30 minutes longer in winter than spring. The people studied were already seeking help for disturbed sleep, so the size of the shift in untroubled sleepers is not settled.

Does winter light help mood?

For seasonal affective disorder, pooling 19 randomized trials with 610 patients, morning bright light beat a dummy light on depression ratings (risk ratio 1.42). It is the best-tested first step and costs little to try. Use it early in the day, and start it as the nights begin drawing in, before winter has fully set in. If your mood drops each dark season, the depression guide has the full routine.

What does Chinese medicine say about the seasons?

Classical medicine treats the seasons as one piece of a larger daily practice it calls nourishing life. For that fuller art, the everyday habits of tending your vitality, see Yang Sheng.