Pick a health goal and see what each tradition — and modern science — actually says about it, side by side.
Built for the moment when you want to compare, not to be told. Choose a goal and the seven traditions and modern science are laid out side by side, each with its own verdict.
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Pick a health goal and compare what each tradition — and modern science — says, based on our published articles.
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Of the 7 traditional claims we have checked in this area, 7 find at least partial support in research.
Ayurveda
India · over 3,000 years
Ayurveda's classical texts give an unusually precise physical rule for portion size. Vāgbhaṭa's Aṣṭāṅga Hṛdaya (Sūtrasthāna 8.46, c. 7th century CE) divides the stomach into four notional parts: two for solids, one for…
Read the article →What the science says
PartialModern trials confirm that sustained, moderate energy reduction improves metabolic and cardiovascular markers, lending real support to Ayurveda's core instinct to eat less than full capacity, though no trial has tested…
TCM
China · over 2,000 years
The Huangdi Neijing, TCM's oldest medical text, names "measure in eating and drinking" (食飲有節) as one of four pillars of a full life, warning that those who ignore it decline by fifty. Its chapters describe overeating as…
Read the article →What the science says
PartialHuman trials now back the general direction of this rule, showing sustained moderate calorie reduction slows measurable biological aging, though TCM's balanced "neither too much nor too little" framing is broader than…
Japanese Kampo
Japan · since the 7th century
Kaibara Ekiken's Yōjōkun, finished in 1712, gives a stated numerical rule: stop at eight or nine parts out of ten, since eating to full capacity "brings calamity." One section urges eating only to half fullness, and…
Read the article →What the science says
PartialRandomized trials of sustained calorie reduction do show measurable slowing of biological aging in humans, which aligns with Ekiken's core claim about lifespan, even though his specific "eight or nine parts" fraction…
Korean Medicine
Korea · Dongui Bogam (1613)
Heo Jun's Donguibogam (1613) places "measure in eating and drinking" (飮食有節) first among the conditions for reaching a hundred years, warning twice against eating past fullness. Its reasoning is physiological: the…
Read the article →What the science says
PartialThe organ-specific slowing of biological aging seen in a recent randomized trial offers modern support for the idea that sustained restraint in eating protects long-term health, even though the "alternating empty and…
Unani
Greco-Persian lineage · since Avicenna
The Canon of Medicine, completed by the Persian physician Ibn Sīnā (d. 1037), frames moderation as reading the body's own signals rather than counting portions: rise from the table while some desire to eat still…
Read the article →What the science says
PartialRandomized human trials support the broader claim that eating below full capacity extends markers of healthy aging, though the Canon's pulse-and-breath test for correct portion size has no direct modern trial behind it.
European Herbalism
Europe · centuries of folk use
The Regimen Sanitatis Salernitanum warns that a large supper brings the stomach's "greatest punishment" and names a moderate diet one of three physicians standing in for all others. Luigi Cornaro's 1558 Discorsi della…
Read the article →What the science says
PartialModern randomized trials now confirm that sustained caloric restriction improves metabolic health and slows biological aging markers in real people, giving Cornaro's personal experiment more scientific company than he…
Tibetan Medicine (Sowa Rigpa)
Tibet · Sowa Rigpa
The Four Tantras (rGyud bzhi), canonized in the 13th century, devote a full chapter of the Explanatory Tantra to portion size, picturing the stomach divided into four parts: two for food, one for drink, one left empty…
Read the article →What the science says
PartialRecent trials showing that sustained moderate energy reduction slows biological aging echo the Tantras' basic caution against overfilling, though the tradition's constitution-based approach differs fundamentally from a…
Modern science is not a tradition. We list it separately — as an independent check on the claims above, not as one more voice among them.
Modern Science
Long before anyone measured metabolic rate in a lab, six different healing traditions independently landed on the same rule: leave the table a little hungry.
Read the article →Not medical advice. Consult a healthcare professional.