**1. Introduction**

The life span of human is getting elongated especially in developed countries, although the maximum life span is expected no longer than 135 years [1]. Under this situation, the needs for elongation of healthy life span are social concern [2]. The healthy life span is the life period in that individuals can actively enjoy their life activities and wellness without hospitalization or with fewer assistance by others, even if they carry any manageable disorders. In the longevity society, the life style and age-related diseases such as diabetes, dementia, and cancer are disincentive for the healthy life span [3]. They are the complex diseases with multiple pathogenic factors and symptoms, and thus, the treating strategy of modern western medicine to remove specific pathogen is often useless. Therefore, the prevention and control of these disorders are recognized more important rather than the treatment of serious endpoint diseases lead by these disorders. The importance of preventive

#### *Complementary Therapies*

medicine has been discussed in the traditional oriental medicines using the term Mibyou [4]. The Mibyou was defined as a certain pathogenic condition being not healthy but not ill, and the treatment of Mibyou was considered more important than treating the diagnosed diseases since Mibyou is an entrance for the serious endpoint diseases. Mibyou that is also often described as sub-healthy condition in the present day [5] is thus an important concept that should be renovated in the current preventive medicine as a target for attaining healthy life expenditure.
