Galen — Air and Environment
The first non-natural — air and environment, which Galen called the first condition of health. Why the air we breathe and the places we live shape our well-being, confirmed by modern science.
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Galen — The Art of Preserving Health
Galen's On the Preservation of Health (c. 175 CE) — the founding Western text of preventive regimen, built on the modifiable 'non-naturals,' and the deepest Western root of the same art the East calls yangsheng.
Galen — The Six Non-Naturals and Moderation
Galen's complete framework of preventive health — the six modifiable factors of daily life — and the master rule that governs them all: moderation, since too much or too little of anything breeds disease.
Galen — Food and Drink
The second non-natural — food and drink. Galen's teaching on diet as a chief instrument of health, governed by moderation in quantity and suited in quality to the person, and its convergence with 饮食有节.