The sages of ancient times emphasized not the treatment of disease, but rather the prevention of its occurrence. To administer medicines to diseases which have already developed and to suppress revolts which have already begun is comparable to the behavior of one who begins to dig a well after he has become thirsty and of one who begins to forge his weapons after he has engaged in battle. Would these actions not be too late?- The Yellow Emperor's Internal Classic, Simple Questions, quoted in Tao: The Subtle Universal Law and the Integral Way of Life by Hua-Ching Ni
Seems pretty straightforward, doesn't it? Hua-Ching Ni goes on to explain that, in the Chinese system, "it is possible to detect energy imbalances long before they are seen as an overt disease."
From the point of view of modern medicine, health is merely the absence of disease. But, by taking a preventive route, one may elevate one's general state of health to a level at which one may consistently enjoy a positive feeling of well-being with an abundance of physical and mental energy.
Sounds great, doesn't it? How does one get there, to a state of health where you just feel great and have lots of energy all the time? Four things: regulation of the mind and your emotions, proper physical activity, proper diet, and staying in tune with the four seasons ("proper" here means both the right amount and the right type).