Dogen was one of the founders of Japanese Zen Buddhism. He wrote many instructive scriptures regarding the way of meditation and discipline of monks. Although most of their contents were religious philosophy, still they included practical matters, such as, hygiene, nutrition, respiration, sleep, cognitive control of sensation, and other such matters. Especially, his classic literature, such as Shobogenzou and Eiheikouroku, contain many tips on sanitation, breathing, and psycho-physical relationships. Prior to the development of modern respiratory physiology, Zen meditators are considered to have had knowledge that nutrition and way of breathing have significant impact on psychiatric state and general body condition. Examples of their knowledge regarding respiration include the effects of deep inhalation and slow exhalation on anxiety and general wellness. In the present review, the contents of Dogen’s classic literature are compared with modern medical recommendations and scientific evidence. Dogen’s descriptions regarding hygiene, nutrition, sensation, breathing, and such matters are considered practical and medically explainable from the scientific evidence of modern medicine.
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