Yi Hwang (1501~1570) explained his theory ``principle issues and material follows, material issues and principle mounts" in the sixth diagram according to the saying ``The mind combines and governs nature and feelings" in his ``Ten Diagrams on Sage Learning". This theory can be applied usefully not only to manage the mental and physical health of an individual but also to manage the health of a society. In the first diagram of the "Supreme ultimate" in ``Ten Diagrams on Sage Learning". Yi Hwang explained his synthetic evolution theory which integrates the evolution of life with the evolution process of the physical universe after the big bang. With his synthetic evolution theory, he explained the developing principle (nature) of the universe after the big bang (supreme ultimate) and the development of the physical universe (material). The nature of mankind is a part of the common principle of universe development, and the human body comes into being with the material of physical universe through the universe evolution process. Human nature also has a common denominator with the other creatures of the universe on the same level of evolution When we apply Yi Hwang`s theory, nature (principle) issues and body (material) follows, body (material) issues and nature (principle) mounts" to the human characters adapted to different climate zones, we can explain the relationship between human hereditary nature and the postnatal effect of the environment. Physical, emotional, mental and social characteristics of humans primarily originate from hereditary nature. We can describe it as "nature issues and body follows". Physical, emotional, mental and social characters of humans are revealed depending on secondary postnatal changing levels during the growth period, and the secondary changes proceed under hereditary nature. We can express it as, "body issues and nature mounts". We can also explain his theory with the trait of the human body meridian. Every human constitution, the synthetic phenotype of different characters adapted to climate zones, has their own maldistributed meridian principle adapted to climate zones which developed as early humans moved from Africa to new oecumenes in other continents. Their own maldistributed meridian principle of each phenotype is the origin of their different physical, emotional, mental and social characteristics. We can describe it as, "phenotype principle (nature) issues and body meridian follows". The characters of phenotype are revealed depending on secondary postnatal changing levels of declination between the strong and weak condition of body meridians, and the secondary changes proceed under phenotype principle (nature). We can express it as, "body meridian issues and phenotype principle (nature) mounts". This secondary postnatal changing level between strong and weak declination conditions of body meridians is the important origin of the disorder and expression level of human emotion and behavior. If the declination of the strong and weak conditions of body meridians grows serious, it can cause not only individual disease but also social side effects like aberrant behavior. Therefore, it is very important to find out the declination level of strong and weak conditions of body meridians as early as possible, and the management of the condition of body meridians has priority over any other method to manage the physical and mental health of the individual and the health of society. Very delicate and non-invasive, magnetic acupuncture can be applied to diagnose and manage the conditions of body meridians differently according to what phenotype principle the subject has. This is the concrete method of applying the theory "principle issues and material follows, material issues and principle mounts`` from Yi Hwang for individual and social health.